pytorch - ✅(Solved) Fix DISABLED test_ensemble_regression_mechanism_make_functional_cpu (__main__.TestExamplesCorrectnessCPU) [1 pull requests, 2 comments, 1 participants]

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pytorch/pytorch#180299Fetched 2026-04-15 06:18:49
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Error Message

Traceback (most recent call last): File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4600, in test_ensemble_regression class MLPClassifier(nn.Module): File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4619, in torch_dynamo_resume_in_test_ensemble_regression_at_4600 MLPClassifier().to(device), mechanism File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4618, in torch_dynamo_resume_in_test_ensemble_regression_at_4619 func_model, weights = _get_weights_and_functional_call( File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4656, in torch_dynamo_resume_in_test_ensemble_regression_at_4618 batched_weights = init_fn(num_models=2) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 2432, in call result = self._torchdynamo_orig_backend( frame, cache_entry, self.hooks, frame_state, skip=1 ) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 2150, in call result = self._inner_convert( frame, cache_entry, hooks, frame_state, skip=skip + 1 ) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 735, in call result = _compile( frame.f_code, ...<16 lines>... convert_frame_box=self._box, ) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1919, in _compile guarded_code, tracer_output = compile_inner(code, one_graph, hooks) ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_utils_internal.py", line 96, in wrapper_function return function(*args, **kwargs) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1535, in compile_inner result = _compile_inner(code, one_graph, hooks) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1594, in _compile_inner dynamo_output = compile_frame( code, ...<11 lines>... package=package, ) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1442, in compile_frame bytecode, tracer_output = transform_code_object(code, transform) ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/bytecode_transformation.py", line 1626, in transform_code_object tracer_output = transformations(instructions, code_options) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1414, in transform tracer_output = trace_frame( code, ...<14 lines>... package=package, ) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 342, in _fn return fn(*args, **kwargs) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 875, in trace_frame run_tracer() ~~~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 856, in run_tracer tracer.run() ~~~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run while self.step(): ~~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step self.dispatch_table[inst.opcode](self, inst) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/dynamo/symbolic_convert.py", line 2288, in FOR_ITER val = it.next_variable(self) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/dynamo/variables/functions.py", line 1174, in next_variable return tracer.inline_call() ~~~~~~~~~~~~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/dynamo/symbolic_convert.py", line 5734, in inline_call return super().inline_call() ~~~~~~~~~~~~~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/dynamo/symbolic_convert.py", line 5463, in inline_call self.run() ~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run while self.step(): ~~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step self.dispatch_table[inst.opcode](self, inst) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper return inner_fn(self, inst) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 4171, in CALL self._call(inst) ~~~~~~~~~~^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 4162, in _call self.call_function(fn, args, kwargs) ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function self.push(fn.call_function(self, args, kwargs)) # type: ignore[arg-type] ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/lazy.py", line 294, in realize_and_forward return getattr(self.realize(), name)(*args, **kwargs) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/user_defined.py", line 1175, in call_function return tx.inline_user_function_return( ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^ VariableTracker.build( ^^^^^^^^^^^^^^^^^^^^^^ ...<3 lines>... kwargs, ^^^^^^^ ) ^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1408, in inline_user_function_return return InliningInstructionTranslator.inline_call(self, fn, args, kwargs) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/dynamo/symbolic_convert.py", line 5242, in inline_call return tracer.inline_call() ~~~~~~~~~~~~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/dynamo/symbolic_convert.py", line 5463, in inline_call self.run() ~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run while self.step(): ~~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step self.dispatch_table[inst.opcode](self, inst) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper return inner_fn(self, inst) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 2851, in CALL_FUNCTION_EX self.call_function(fn, argsvars.items, kwargsvars) ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function self.push(fn.call_function(self, args, kwargs)) # type: ignore[arg-type] ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 1674, in call_function return super().call_function(tx, args, kwargs) ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 815, in call_function return super().call_function(tx, args, kwargs) ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 494, in call_function return tx.inline_user_function_return(self, [*self.self_args(), *args], kwargs) # type: ignore[attr-defined] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1408, in inline_user_function_return return InliningInstructionTranslator.inline_call(self, fn, args, kwargs) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/dynamo/symbolic_convert.py", line 5242, in inline_call return tracer.inline_call() ~~~~~~~~~~~~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/dynamo/symbolic_convert.py", line 5463, in inline_call self.run() ~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run while self.step(): ~~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step self.dispatch_table[inst.opcode](self, inst) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper return inner_fn(self, inst) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 4171, in CALL self._call(inst) ~~~~~~~~~~^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 4162, in _call self.call_function(fn, args, kwargs) ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function self.push(fn.call_function(self, args, kwargs)) # type: ignore[arg-type] ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/lazy.py", line 294, in realize_and_forward return getattr(self.realize(), name)(*args, **kwargs) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/user_defined.py", line 1175, in call_function return tx.inline_user_function_return( ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^ VariableTracker.build( ^^^^^^^^^^^^^^^^^^^^^^ ...<3 lines>... kwargs, ^^^^^^^ ) ^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1408, in inline_user_function_return return InliningInstructionTranslator.inline_call(self, fn, args, kwargs) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/dynamo/symbolic_convert.py", line 5242, in inline_call return tracer.inline_call() ~~~~~~~~~~~~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/dynamo/symbolic_convert.py", line 5463, in inline_call self.run() ~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run while self.step(): ~~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step self.dispatch_table[inst.opcode](self, inst) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper return inner_fn(self, inst) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 2851, in CALL_FUNCTION_EX self.call_function(fn, argsvars.items, kwargsvars) ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function self.push(fn.call_function(self, args, kwargs)) # type: ignore[arg-type] ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 1674, in call_function return super().call_function(tx, args, kwargs) ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 815, in call_function return super().call_function(tx, args, kwargs) ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 494, in call_function return tx.inline_user_function_return(self, [*self.self_args(), *args], kwargs) # type: ignore[attr-defined] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1408, in inline_user_function_return return InliningInstructionTranslator.inline_call(self, fn, args, kwargs) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/dynamo/symbolic_convert.py", line 5242, in inline_call return tracer.inline_call() ~~~~~~~~~~~~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/dynamo/symbolic_convert.py", line 5463, in inline_call self.run() ~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run while self.step(): ~~~~~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step self.dispatch_table[inst.opcode](self, inst) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper return inner_fn(self, inst) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 2851, in CALL_FUNCTION_EX self.call_function(fn, argsvars.items, kwargsvars) ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function self.push(fn.call_function(self, args, kwargs)) # type: ignore[arg-type] ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/lazy.py", line 294, in realize_and_forward return getattr(self.realize(), name)(args, **kwargs) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/torch.py", line 2699, in call_function tensor_variable = wrap_fx_proxy( tx=tx, ...<4 lines>... ), ) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/builder.py", line 3078, in wrap_fx_proxy return wrap_fx_proxy_cls(target_cls=TensorVariable, **kwargs) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/builder.py", line 3153, in wrap_fx_proxy_cls out: VTTypeAlias = _wrap_fx_proxy( ~~~~~~~~~~~~~~^ target_cls, tx, proxy, example_value, subclass_type, **options ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ) ^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/builder.py", line 3277, in _wrap_fx_proxy example_value = get_fake_value(proxy.node, tx, allow_non_graph_fake=True) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3752, in get_fake_value return _get_fake_value_impl(node, tx, allow_non_graph_fake) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3943, in _get_fake_value_impl _wrap_graph_break_with_torch_runtime_err( ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^ lambda: unimplemented( ^^^^^^^^^^^^^^^^^^^^^^ ...<5 lines>... ) ^ ) ^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3741, in _wrap_graph_break_with_torch_runtime_err raise exc.with_traceback(e.traceback) from None File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3738, in _wrap_graph_break_with_torch_runtime_err gb_fn() ~~~~~^^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3944, in <lambda> lambda: unimplemented( ~~~~~~~~~~~~~^ gb_type="RuntimeError when making fake tensor call", ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ...<3 lines>... from_exc=cause, ^^^^^^^^^^^^^^^ ) ^ File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/exc.py", line 653, in unimplemented raise Unsupported( msg, gb_type, skip_frame, real_stack=past_real_stack ) from from_exc torch._dynamo.exc.TorchRuntimeError: RuntimeError when making fake tensor call Explanation: Dynamo failed to run FX node with fake tensors: call_function <built-in method empty of type object at 0x7f62eff72c70>(((32, 2),), **{'device': None, 'dtype': None}): got RuntimeError('tls_on_entry.has_value() INTERNAL ASSERT FAILED at "/__w/pytorch/pytorch/aten/src/ATen/core/PythonFallbackKernel.cpp":53, please report a bug to PyTorch. ') Hint: Your code may result in an error when running in eager. Please double check that your code doesn't contain a similar error when actually running eager/uncompiled. You can do this by removing the torch.compile call, or by using torch.compiler.set_stance("force_eager").

Developer debug context:

For more details about this graph break, please visit: https://meta-pytorch.github.io/compile-graph-break-site/gb/gb4315.html

from user code: File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4645, in init_fn models = tuple(MLPClassifier().to(device) for _ in range(num_models)) File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4645, in <genexpr> models = tuple(MLPClassifier().to(device) for _ in range(num_models)) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/polyfills/init.py", line 429, in instantiate_user_defined_class_object obj.init(*args, **kwargs) File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4606, in init self.fc1 = nn.Linear(2, self.hidden_dim) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/polyfills/init.py", line 429, in instantiate_user_defined_class_object obj.init(*args, **kwargs) File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/nn/modules/linear.py", line 109, in init torch.empty((out_features, in_features), **factory_kwargs)

Set TORCHDYNAMO_VERBOSE=1 for the internal stack trace (please do this especially if you're reporting a bug to PyTorch). For even more developer context, set TORCH_LOGS="+dynamo"

To execute this test, run the following from the base repo dir: PYTORCH_TEST_WITH_DYNAMO=1 python test/functorch/test_eager_transforms.py TestExamplesCorrectnessCPU.test_ensemble_regression_mechanism_make_functional_cpu

This message can be suppressed by setting PYTORCH_PRINT_REPRO_ON_FAILURE=0

Root Cause

This test was disabled because it is failing in CI. See recent examples and the most recent trunk workflow logs.

Fix Action

Fix / Workaround

Traceback (most recent call last):
  File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4600, in test_ensemble_regression
    class MLPClassifier(nn.Module):
  File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4619, in torch_dynamo_resume_in_test_ensemble_regression_at_4600
    MLPClassifier().to(device), mechanism
  File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4618, in torch_dynamo_resume_in_test_ensemble_regression_at_4619
    func_model, weights = _get_weights_and_functional_call(
  File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4656, in torch_dynamo_resume_in_test_ensemble_regression_at_4618
    batched_weights = init_fn(num_models=2)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 2432, in __call__
    result = self._torchdynamo_orig_backend(
        frame, cache_entry, self.hooks, frame_state, skip=1
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 2150, in __call__
    result = self._inner_convert(
        frame, cache_entry, hooks, frame_state, skip=skip + 1
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 735, in __call__
    result = _compile(
        frame.f_code,
    ...<16 lines>...
        convert_frame_box=self._box,
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1919, in _compile
    guarded_code, tracer_output = compile_inner(code, one_graph, hooks)
                                  ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_utils_internal.py", line 96, in wrapper_function
    return function(*args, **kwargs)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1535, in compile_inner
    result = _compile_inner(code, one_graph, hooks)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1594, in _compile_inner
    dynamo_output = compile_frame(
        code,
    ...<11 lines>...
        package=package,
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1442, in compile_frame
    bytecode, tracer_output = transform_code_object(code, transform)
                              ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/bytecode_transformation.py", line 1626, in transform_code_object
    tracer_output = transformations(instructions, code_options)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1414, in transform
    tracer_output = trace_frame(
        code,
    ...<14 lines>...
        package=package,
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 342, in _fn
    return fn(*args, **kwargs)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 875, in trace_frame
    run_tracer()
    ~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 856, in run_tracer
    tracer.run()
    ~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 2288, in FOR_ITER
    val = it.next_variable(self)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 1174, in next_variable
    return tracer.inline_call_()
           ~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5734, in inline_call_
    return super().inline_call_()
           ~~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5463, in inline_call_
    self.run()
    ~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper
    return inner_fn(self, inst)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 4171, in CALL
    self._call(inst)
    ~~~~~~~~~~^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 4162, in _call
    self.call_function(fn, args, kwargs)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function
    self.push(fn.call_function(self, args, kwargs))  # type: ignore[arg-type]
              ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/lazy.py", line 294, in realize_and_forward
    return getattr(self.realize(), name)(*args, **kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/user_defined.py", line 1175, in call_function
    return tx.inline_user_function_return(
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        VariableTracker.build(
        ^^^^^^^^^^^^^^^^^^^^^^
    ...<3 lines>...
        kwargs,
        ^^^^^^^
    )
    ^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1408, in inline_user_function_return
    return InliningInstructionTranslator.inline_call(self, fn, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5242, in inline_call
    return tracer.inline_call_()
           ~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5463, in inline_call_
    self.run()
    ~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper
    return inner_fn(self, inst)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 2851, in CALL_FUNCTION_EX
    self.call_function(fn, argsvars.items, kwargsvars)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function
    self.push(fn.call_function(self, args, kwargs))  # type: ignore[arg-type]
              ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 1674, in call_function
    return super().call_function(tx, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 815, in call_function
    return super().call_function(tx, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 494, in call_function
    return tx.inline_user_function_return(self, [*self.self_args(), *args], kwargs)  # type: ignore[attr-defined]
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1408, in inline_user_function_return
    return InliningInstructionTranslator.inline_call(self, fn, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5242, in inline_call
    return tracer.inline_call_()
           ~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5463, in inline_call_
    self.run()
    ~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper
    return inner_fn(self, inst)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 4171, in CALL
    self._call(inst)
    ~~~~~~~~~~^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 4162, in _call
    self.call_function(fn, args, kwargs)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function
    self.push(fn.call_function(self, args, kwargs))  # type: ignore[arg-type]
              ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/lazy.py", line 294, in realize_and_forward
    return getattr(self.realize(), name)(*args, **kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/user_defined.py", line 1175, in call_function
    return tx.inline_user_function_return(
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        VariableTracker.build(
        ^^^^^^^^^^^^^^^^^^^^^^
    ...<3 lines>...
        kwargs,
        ^^^^^^^
    )
    ^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1408, in inline_user_function_return
    return InliningInstructionTranslator.inline_call(self, fn, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5242, in inline_call
    return tracer.inline_call_()
           ~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5463, in inline_call_
    self.run()
    ~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper
    return inner_fn(self, inst)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 2851, in CALL_FUNCTION_EX
    self.call_function(fn, argsvars.items, kwargsvars)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function
    self.push(fn.call_function(self, args, kwargs))  # type: ignore[arg-type]
              ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 1674, in call_function
    return super().call_function(tx, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 815, in call_function
    return super().call_function(tx, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 494, in call_function
    return tx.inline_user_function_return(self, [*self.self_args(), *args], kwargs)  # type: ignore[attr-defined]
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1408, in inline_user_function_return
    return InliningInstructionTranslator.inline_call(self, fn, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5242, in inline_call
    return tracer.inline_call_()
           ~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5463, in inline_call_
    self.run()
    ~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper
    return inner_fn(self, inst)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 2851, in CALL_FUNCTION_EX
    self.call_function(fn, argsvars.items, kwargsvars)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function
    self.push(fn.call_function(self, args, kwargs))  # type: ignore[arg-type]
              ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/lazy.py", line 294, in realize_and_forward
    return getattr(self.realize(), name)(*args, **kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/torch.py", line 2699, in call_function
    tensor_variable = wrap_fx_proxy(
        tx=tx,
    ...<4 lines>...
        ),
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/builder.py", line 3078, in wrap_fx_proxy
    return wrap_fx_proxy_cls(target_cls=TensorVariable, **kwargs)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/builder.py", line 3153, in wrap_fx_proxy_cls
    out: VTTypeAlias = _wrap_fx_proxy(
                       ~~~~~~~~~~~~~~^
        target_cls, tx, proxy, example_value, subclass_type, **options
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/builder.py", line 3277, in _wrap_fx_proxy
    example_value = get_fake_value(proxy.node, tx, allow_non_graph_fake=True)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3752, in get_fake_value
    return _get_fake_value_impl(node, tx, allow_non_graph_fake)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3943, in _get_fake_value_impl
    _wrap_graph_break_with_torch_runtime_err(
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        lambda: unimplemented(
        ^^^^^^^^^^^^^^^^^^^^^^
    ...<5 lines>...
        )
        ^
    )
    ^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3741, in _wrap_graph_break_with_torch_runtime_err
    raise exc.with_traceback(e.__traceback__) from None
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3738, in _wrap_graph_break_with_torch_runtime_err
    gb_fn()
    ~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3944, in <lambda>
    lambda: unimplemented(
            ~~~~~~~~~~~~~^
        gb_type="RuntimeError when making fake tensor call",
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<3 lines>...
        from_exc=cause,
        ^^^^^^^^^^^^^^^
    )
    ^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/exc.py", line 653, in unimplemented
    raise Unsupported(
        msg, gb_type, skip_frame, real_stack=past_real_stack
    ) from from_exc
torch._dynamo.exc.TorchRuntimeError: RuntimeError when making fake tensor call
  Explanation: Dynamo failed to run FX node with fake tensors: call_function <built-in method empty of type object at 0x7f62eff72c70>(*((32, 2),), **{'device': None, 'dtype': None}): got RuntimeError('tls_on_entry.has_value() INTERNAL ASSERT FAILED at "/__w/pytorch/pytorch/aten/src/ATen/core/PythonFallbackKernel.cpp":53, please report a bug to PyTorch. ')
  Hint: Your code may result in an error when running in eager. Please double check that your code doesn't contain a similar error when actually running eager/uncompiled. You can do this by removing the `torch.compile` call, or by using `torch.compiler.set_stance("force_eager")`.

PR fix notes

PR #180636: [dynamo] restore Python dispatch TLS across graph breaks

Description (problem / solution / changelog)

Stack from ghstack (oldest at bottom):

  • -> #180636

Fix a flaky functorch+dynamo failure where Python fallback can be entered without a valid TLS snapshot, or with Python dispatch TLS leaked past the compiled frame. Use MaybeSetTLSOnEntryGuard in Python fallback, and restore the saved dispatch TLS around the compiled call so later eager ops like assertEqual/isclose/module setup do not trip the same failure after a graph break.

Add a regression test covering the graph-break path that previously left Python=True and PythonTLSSnapshot=False in local dispatch TLS.

This appears related to the flaky test disables in #180299, #180300, #180320, #180321, #180322, #180336, #180337, and likely the same failure family as #180436, #180555, #180590, #180591, and #180592. Though I could not repro any of them locally.

cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @kadeng @chauhang @amjames @Lucaskabela @jataylo @azahed98

Changed files

  • aten/src/ATen/core/PythonFallbackKernel.cpp (modified, +1/-1)
  • test/dynamo/test_error_messages.py (modified, +12/-0)
  • test/dynamo/test_python_dispatcher.py (modified, +29/-0)
  • torch/_dynamo/eval_frame.py (modified, +46/-39)

Code Example

Traceback (most recent call last):
  File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4600, in test_ensemble_regression
    class MLPClassifier(nn.Module):
  File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4619, in torch_dynamo_resume_in_test_ensemble_regression_at_4600
    MLPClassifier().to(device), mechanism
  File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4618, in torch_dynamo_resume_in_test_ensemble_regression_at_4619
    func_model, weights = _get_weights_and_functional_call(
  File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4656, in torch_dynamo_resume_in_test_ensemble_regression_at_4618
    batched_weights = init_fn(num_models=2)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 2432, in __call__
    result = self._torchdynamo_orig_backend(
        frame, cache_entry, self.hooks, frame_state, skip=1
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 2150, in __call__
    result = self._inner_convert(
        frame, cache_entry, hooks, frame_state, skip=skip + 1
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 735, in __call__
    result = _compile(
        frame.f_code,
    ...<16 lines>...
        convert_frame_box=self._box,
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1919, in _compile
    guarded_code, tracer_output = compile_inner(code, one_graph, hooks)
                                  ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_utils_internal.py", line 96, in wrapper_function
    return function(*args, **kwargs)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1535, in compile_inner
    result = _compile_inner(code, one_graph, hooks)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1594, in _compile_inner
    dynamo_output = compile_frame(
        code,
    ...<11 lines>...
        package=package,
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1442, in compile_frame
    bytecode, tracer_output = transform_code_object(code, transform)
                              ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/bytecode_transformation.py", line 1626, in transform_code_object
    tracer_output = transformations(instructions, code_options)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1414, in transform
    tracer_output = trace_frame(
        code,
    ...<14 lines>...
        package=package,
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 342, in _fn
    return fn(*args, **kwargs)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 875, in trace_frame
    run_tracer()
    ~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 856, in run_tracer
    tracer.run()
    ~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 2288, in FOR_ITER
    val = it.next_variable(self)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 1174, in next_variable
    return tracer.inline_call_()
           ~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5734, in inline_call_
    return super().inline_call_()
           ~~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5463, in inline_call_
    self.run()
    ~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper
    return inner_fn(self, inst)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 4171, in CALL
    self._call(inst)
    ~~~~~~~~~~^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 4162, in _call
    self.call_function(fn, args, kwargs)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function
    self.push(fn.call_function(self, args, kwargs))  # type: ignore[arg-type]
              ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/lazy.py", line 294, in realize_and_forward
    return getattr(self.realize(), name)(*args, **kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/user_defined.py", line 1175, in call_function
    return tx.inline_user_function_return(
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        VariableTracker.build(
        ^^^^^^^^^^^^^^^^^^^^^^
    ...<3 lines>...
        kwargs,
        ^^^^^^^
    )
    ^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1408, in inline_user_function_return
    return InliningInstructionTranslator.inline_call(self, fn, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5242, in inline_call
    return tracer.inline_call_()
           ~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5463, in inline_call_
    self.run()
    ~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper
    return inner_fn(self, inst)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 2851, in CALL_FUNCTION_EX
    self.call_function(fn, argsvars.items, kwargsvars)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function
    self.push(fn.call_function(self, args, kwargs))  # type: ignore[arg-type]
              ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 1674, in call_function
    return super().call_function(tx, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 815, in call_function
    return super().call_function(tx, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 494, in call_function
    return tx.inline_user_function_return(self, [*self.self_args(), *args], kwargs)  # type: ignore[attr-defined]
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1408, in inline_user_function_return
    return InliningInstructionTranslator.inline_call(self, fn, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5242, in inline_call
    return tracer.inline_call_()
           ~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5463, in inline_call_
    self.run()
    ~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper
    return inner_fn(self, inst)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 4171, in CALL
    self._call(inst)
    ~~~~~~~~~~^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 4162, in _call
    self.call_function(fn, args, kwargs)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function
    self.push(fn.call_function(self, args, kwargs))  # type: ignore[arg-type]
              ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/lazy.py", line 294, in realize_and_forward
    return getattr(self.realize(), name)(*args, **kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/user_defined.py", line 1175, in call_function
    return tx.inline_user_function_return(
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        VariableTracker.build(
        ^^^^^^^^^^^^^^^^^^^^^^
    ...<3 lines>...
        kwargs,
        ^^^^^^^
    )
    ^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1408, in inline_user_function_return
    return InliningInstructionTranslator.inline_call(self, fn, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5242, in inline_call
    return tracer.inline_call_()
           ~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5463, in inline_call_
    self.run()
    ~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper
    return inner_fn(self, inst)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 2851, in CALL_FUNCTION_EX
    self.call_function(fn, argsvars.items, kwargsvars)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function
    self.push(fn.call_function(self, args, kwargs))  # type: ignore[arg-type]
              ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 1674, in call_function
    return super().call_function(tx, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 815, in call_function
    return super().call_function(tx, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 494, in call_function
    return tx.inline_user_function_return(self, [*self.self_args(), *args], kwargs)  # type: ignore[attr-defined]
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1408, in inline_user_function_return
    return InliningInstructionTranslator.inline_call(self, fn, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5242, in inline_call
    return tracer.inline_call_()
           ~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5463, in inline_call_
    self.run()
    ~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper
    return inner_fn(self, inst)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 2851, in CALL_FUNCTION_EX
    self.call_function(fn, argsvars.items, kwargsvars)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function
    self.push(fn.call_function(self, args, kwargs))  # type: ignore[arg-type]
              ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/lazy.py", line 294, in realize_and_forward
    return getattr(self.realize(), name)(*args, **kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/torch.py", line 2699, in call_function
    tensor_variable = wrap_fx_proxy(
        tx=tx,
    ...<4 lines>...
        ),
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/builder.py", line 3078, in wrap_fx_proxy
    return wrap_fx_proxy_cls(target_cls=TensorVariable, **kwargs)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/builder.py", line 3153, in wrap_fx_proxy_cls
    out: VTTypeAlias = _wrap_fx_proxy(
                       ~~~~~~~~~~~~~~^
        target_cls, tx, proxy, example_value, subclass_type, **options
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/builder.py", line 3277, in _wrap_fx_proxy
    example_value = get_fake_value(proxy.node, tx, allow_non_graph_fake=True)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3752, in get_fake_value
    return _get_fake_value_impl(node, tx, allow_non_graph_fake)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3943, in _get_fake_value_impl
    _wrap_graph_break_with_torch_runtime_err(
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        lambda: unimplemented(
        ^^^^^^^^^^^^^^^^^^^^^^
    ...<5 lines>...
        )
        ^
    )
    ^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3741, in _wrap_graph_break_with_torch_runtime_err
    raise exc.with_traceback(e.__traceback__) from None
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3738, in _wrap_graph_break_with_torch_runtime_err
    gb_fn()
    ~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3944, in <lambda>
    lambda: unimplemented(
            ~~~~~~~~~~~~~^
        gb_type="RuntimeError when making fake tensor call",
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<3 lines>...
        from_exc=cause,
        ^^^^^^^^^^^^^^^
    )
    ^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/exc.py", line 653, in unimplemented
    raise Unsupported(
        msg, gb_type, skip_frame, real_stack=past_real_stack
    ) from from_exc
torch._dynamo.exc.TorchRuntimeError: RuntimeError when making fake tensor call
  Explanation: Dynamo failed to run FX node with fake tensors: call_function <built-in method empty of type object at 0x7f62eff72c70>(*((32, 2),), **{'device': None, 'dtype': None}): got RuntimeError('tls_on_entry.has_value() INTERNAL ASSERT FAILED at "/__w/pytorch/pytorch/aten/src/ATen/core/PythonFallbackKernel.cpp":53, please report a bug to PyTorch. ')
  Hint: Your code may result in an error when running in eager. Please double check that your code doesn't contain a similar error when actually running eager/uncompiled. You can do this by removing the `torch.compile` call, or by using `torch.compiler.set_stance("force_eager")`. 

  Developer debug context: 

 For more details about this graph break, please visit: https://meta-pytorch.github.io/compile-graph-break-site/gb/gb4315.html

from user code:
   File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4645, in init_fn
    models = tuple(MLPClassifier().to(device) for _ in range(num_models))
  File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4645, in <genexpr>
    models = tuple(MLPClassifier().to(device) for _ in range(num_models))
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/polyfills/__init__.py", line 429, in instantiate_user_defined_class_object
    obj.__init__(*args, **kwargs)
  File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4606, in __init__
    self.fc1 = nn.Linear(2, self.hidden_dim)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/polyfills/__init__.py", line 429, in instantiate_user_defined_class_object
    obj.__init__(*args, **kwargs)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/nn/modules/linear.py", line 109, in __init__
    torch.empty((out_features, in_features), **factory_kwargs)

Set TORCHDYNAMO_VERBOSE=1 for the internal stack trace (please do this especially if you're reporting a bug to PyTorch). For even more developer context, set TORCH_LOGS="+dynamo"


To execute this test, run the following from the base repo dir:
    PYTORCH_TEST_WITH_DYNAMO=1 python test/functorch/test_eager_transforms.py TestExamplesCorrectnessCPU.test_ensemble_regression_mechanism_make_functional_cpu

This message can be suppressed by setting PYTORCH_PRINT_REPRO_ON_FAILURE=0
RAW_BUFFERClick to expand / collapse

Platforms: dynamo

This test was disabled because it is failing in CI. See recent examples and the most recent trunk workflow logs.

Over the past 6 hours, it has been determined flaky in 7 workflow(s) with 7 failures and 7 successes.

Debugging instructions (after clicking on the recent samples link): DO NOT ASSUME THINGS ARE OKAY IF THE CI IS GREEN. We now shield flaky tests from developers so CI will thus be green but it will be harder to parse the logs. To find relevant log snippets:

  1. Click on the workflow logs linked above
  2. Click on the Test step of the job so that it is expanded. Otherwise, the grepping will not work.
  3. Grep for test_ensemble_regression_mechanism_make_functional_cpu
  4. There should be several instances run (as flaky tests are rerun in CI) from which you can study the logs.
<details><summary>Sample error message</summary>
Traceback (most recent call last):
  File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4600, in test_ensemble_regression
    class MLPClassifier(nn.Module):
  File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4619, in torch_dynamo_resume_in_test_ensemble_regression_at_4600
    MLPClassifier().to(device), mechanism
  File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4618, in torch_dynamo_resume_in_test_ensemble_regression_at_4619
    func_model, weights = _get_weights_and_functional_call(
  File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4656, in torch_dynamo_resume_in_test_ensemble_regression_at_4618
    batched_weights = init_fn(num_models=2)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 2432, in __call__
    result = self._torchdynamo_orig_backend(
        frame, cache_entry, self.hooks, frame_state, skip=1
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 2150, in __call__
    result = self._inner_convert(
        frame, cache_entry, hooks, frame_state, skip=skip + 1
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 735, in __call__
    result = _compile(
        frame.f_code,
    ...<16 lines>...
        convert_frame_box=self._box,
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1919, in _compile
    guarded_code, tracer_output = compile_inner(code, one_graph, hooks)
                                  ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_utils_internal.py", line 96, in wrapper_function
    return function(*args, **kwargs)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1535, in compile_inner
    result = _compile_inner(code, one_graph, hooks)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1594, in _compile_inner
    dynamo_output = compile_frame(
        code,
    ...<11 lines>...
        package=package,
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1442, in compile_frame
    bytecode, tracer_output = transform_code_object(code, transform)
                              ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/bytecode_transformation.py", line 1626, in transform_code_object
    tracer_output = transformations(instructions, code_options)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 1414, in transform
    tracer_output = trace_frame(
        code,
    ...<14 lines>...
        package=package,
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 342, in _fn
    return fn(*args, **kwargs)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 875, in trace_frame
    run_tracer()
    ~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/convert_frame.py", line 856, in run_tracer
    tracer.run()
    ~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 2288, in FOR_ITER
    val = it.next_variable(self)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 1174, in next_variable
    return tracer.inline_call_()
           ~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5734, in inline_call_
    return super().inline_call_()
           ~~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5463, in inline_call_
    self.run()
    ~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper
    return inner_fn(self, inst)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 4171, in CALL
    self._call(inst)
    ~~~~~~~~~~^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 4162, in _call
    self.call_function(fn, args, kwargs)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function
    self.push(fn.call_function(self, args, kwargs))  # type: ignore[arg-type]
              ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/lazy.py", line 294, in realize_and_forward
    return getattr(self.realize(), name)(*args, **kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/user_defined.py", line 1175, in call_function
    return tx.inline_user_function_return(
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        VariableTracker.build(
        ^^^^^^^^^^^^^^^^^^^^^^
    ...<3 lines>...
        kwargs,
        ^^^^^^^
    )
    ^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1408, in inline_user_function_return
    return InliningInstructionTranslator.inline_call(self, fn, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5242, in inline_call
    return tracer.inline_call_()
           ~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5463, in inline_call_
    self.run()
    ~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper
    return inner_fn(self, inst)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 2851, in CALL_FUNCTION_EX
    self.call_function(fn, argsvars.items, kwargsvars)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function
    self.push(fn.call_function(self, args, kwargs))  # type: ignore[arg-type]
              ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 1674, in call_function
    return super().call_function(tx, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 815, in call_function
    return super().call_function(tx, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 494, in call_function
    return tx.inline_user_function_return(self, [*self.self_args(), *args], kwargs)  # type: ignore[attr-defined]
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1408, in inline_user_function_return
    return InliningInstructionTranslator.inline_call(self, fn, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5242, in inline_call
    return tracer.inline_call_()
           ~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5463, in inline_call_
    self.run()
    ~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper
    return inner_fn(self, inst)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 4171, in CALL
    self._call(inst)
    ~~~~~~~~~~^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 4162, in _call
    self.call_function(fn, args, kwargs)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function
    self.push(fn.call_function(self, args, kwargs))  # type: ignore[arg-type]
              ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/lazy.py", line 294, in realize_and_forward
    return getattr(self.realize(), name)(*args, **kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/user_defined.py", line 1175, in call_function
    return tx.inline_user_function_return(
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        VariableTracker.build(
        ^^^^^^^^^^^^^^^^^^^^^^
    ...<3 lines>...
        kwargs,
        ^^^^^^^
    )
    ^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1408, in inline_user_function_return
    return InliningInstructionTranslator.inline_call(self, fn, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5242, in inline_call
    return tracer.inline_call_()
           ~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5463, in inline_call_
    self.run()
    ~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper
    return inner_fn(self, inst)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 2851, in CALL_FUNCTION_EX
    self.call_function(fn, argsvars.items, kwargsvars)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function
    self.push(fn.call_function(self, args, kwargs))  # type: ignore[arg-type]
              ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 1674, in call_function
    return super().call_function(tx, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 815, in call_function
    return super().call_function(tx, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/functions.py", line 494, in call_function
    return tx.inline_user_function_return(self, [*self.self_args(), *args], kwargs)  # type: ignore[attr-defined]
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1408, in inline_user_function_return
    return InliningInstructionTranslator.inline_call(self, fn, args, kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5242, in inline_call
    return tracer.inline_call_()
           ~~~~~~~~~~~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 5463, in inline_call_
    self.run()
    ~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1813, in run
    while self.step():
          ~~~~~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1480, in step
    self.dispatch_table[inst.opcode](self, inst)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1017, in wrapper
    return inner_fn(self, inst)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 2851, in CALL_FUNCTION_EX
    self.call_function(fn, argsvars.items, kwargsvars)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/symbolic_convert.py", line 1381, in call_function
    self.push(fn.call_function(self, args, kwargs))  # type: ignore[arg-type]
              ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/lazy.py", line 294, in realize_and_forward
    return getattr(self.realize(), name)(*args, **kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/torch.py", line 2699, in call_function
    tensor_variable = wrap_fx_proxy(
        tx=tx,
    ...<4 lines>...
        ),
    )
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/builder.py", line 3078, in wrap_fx_proxy
    return wrap_fx_proxy_cls(target_cls=TensorVariable, **kwargs)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/builder.py", line 3153, in wrap_fx_proxy_cls
    out: VTTypeAlias = _wrap_fx_proxy(
                       ~~~~~~~~~~~~~~^
        target_cls, tx, proxy, example_value, subclass_type, **options
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/variables/builder.py", line 3277, in _wrap_fx_proxy
    example_value = get_fake_value(proxy.node, tx, allow_non_graph_fake=True)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3752, in get_fake_value
    return _get_fake_value_impl(node, tx, allow_non_graph_fake)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3943, in _get_fake_value_impl
    _wrap_graph_break_with_torch_runtime_err(
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        lambda: unimplemented(
        ^^^^^^^^^^^^^^^^^^^^^^
    ...<5 lines>...
        )
        ^
    )
    ^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3741, in _wrap_graph_break_with_torch_runtime_err
    raise exc.with_traceback(e.__traceback__) from None
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3738, in _wrap_graph_break_with_torch_runtime_err
    gb_fn()
    ~~~~~^^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/utils.py", line 3944, in <lambda>
    lambda: unimplemented(
            ~~~~~~~~~~~~~^
        gb_type="RuntimeError when making fake tensor call",
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<3 lines>...
        from_exc=cause,
        ^^^^^^^^^^^^^^^
    )
    ^
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/exc.py", line 653, in unimplemented
    raise Unsupported(
        msg, gb_type, skip_frame, real_stack=past_real_stack
    ) from from_exc
torch._dynamo.exc.TorchRuntimeError: RuntimeError when making fake tensor call
  Explanation: Dynamo failed to run FX node with fake tensors: call_function <built-in method empty of type object at 0x7f62eff72c70>(*((32, 2),), **{'device': None, 'dtype': None}): got RuntimeError('tls_on_entry.has_value() INTERNAL ASSERT FAILED at "/__w/pytorch/pytorch/aten/src/ATen/core/PythonFallbackKernel.cpp":53, please report a bug to PyTorch. ')
  Hint: Your code may result in an error when running in eager. Please double check that your code doesn't contain a similar error when actually running eager/uncompiled. You can do this by removing the `torch.compile` call, or by using `torch.compiler.set_stance("force_eager")`. 

  Developer debug context: 

 For more details about this graph break, please visit: https://meta-pytorch.github.io/compile-graph-break-site/gb/gb4315.html

from user code:
   File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4645, in init_fn
    models = tuple(MLPClassifier().to(device) for _ in range(num_models))
  File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4645, in <genexpr>
    models = tuple(MLPClassifier().to(device) for _ in range(num_models))
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/polyfills/__init__.py", line 429, in instantiate_user_defined_class_object
    obj.__init__(*args, **kwargs)
  File "/__w/pytorch/pytorch/test/functorch/test_eager_transforms.py", line 4606, in __init__
    self.fc1 = nn.Linear(2, self.hidden_dim)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/_dynamo/polyfills/__init__.py", line 429, in instantiate_user_defined_class_object
    obj.__init__(*args, **kwargs)
  File "/opt/conda/envs/py_3.14/lib/python3.14t/site-packages/torch/nn/modules/linear.py", line 109, in __init__
    torch.empty((out_features, in_features), **factory_kwargs)

Set TORCHDYNAMO_VERBOSE=1 for the internal stack trace (please do this especially if you're reporting a bug to PyTorch). For even more developer context, set TORCH_LOGS="+dynamo"


To execute this test, run the following from the base repo dir:
    PYTORCH_TEST_WITH_DYNAMO=1 python test/functorch/test_eager_transforms.py TestExamplesCorrectnessCPU.test_ensemble_regression_mechanism_make_functional_cpu

This message can be suppressed by setting PYTORCH_PRINT_REPRO_ON_FAILURE=0
</details>

Test file path: functorch/test_eager_transforms.py

For all disabled tests (by GitHub issue), see https://hud.pytorch.org/disabled.

cc @chauhang @penguinwu @Chillee @samdow @kshitij12345

extent analysis

TL;DR

The test test_ensemble_regression_mechanism_make_functional_cpu is failing due to a TorchRuntimeError caused by Dynamo's failure to run an FX node with fake tensors.

Guidance

  1. Review the stacktrace: The error message indicates a TorchRuntimeError when making a fake tensor call, which suggests an issue with the tensor creation process.
  2. Check the code: The error occurs in the init_fn function, specifically when creating a tuple of MLPClassifier models and moving them to a device. Verify that the device and dtype arguments are correctly set.
  3. Test without compilation: As suggested in the error message, try removing the torch.compile call or setting torch.compiler.set_stance("force_eager") to see if the error persists in eager mode.
  4. Enable verbose logging: Set TORCHDYNAMO_VERBOSE=1 to obtain the internal stack trace, which may provide more insight into the issue.

Example

No specific code example is provided, as the issue is related to a complex error message and requires further investigation.

Notes

  • The error message suggests that the issue may be related to the creation of fake tensors, which is a complex process in PyTorch.
  • The test is disabled due to flakiness, and the error message provides guidance on how to reproduce and debug the issue.

Recommendation

Apply a workaround by setting torch.compiler.set_stance("force_eager") to test the code in eager mode and verify if the error persists. This may help identify if the issue is specific to the compiled mode or a more general problem with the code.

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