add linear lr warmup and lr decay scheduler#23
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lessw2020 merged 8 commits intopytorch:mainfrom Feb 1, 2024
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Thanks for adding this. I think we should use the pytorch optim apis instead of doing manual lr update for all optim states. either use LambaLR or LinearLR https://pytorch.org/docs/stable/optim.html#how-to-adjust-learning-rate
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updates - now uses LambdaLR and does a full linear warmup and linear decay. |
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Sounds good, have a few more suggestion, can either do in this PR or have a follow up.
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this PR adds a linear lr scheduler and includes some automation based on current best practices: a - takes user lr provided in args as lr_max, and computes final min_lr for the decay schedule based on lr / 10, per chinchilla paper. (i.e. total decay will be one order of magnitude). b - computes an automated linear warmup schedule of 10% total iters as warmup, with min warmup of 2 steps. c - computes a linear decay schedule after warmup, declining from lr_max to lr_min over the end of warmup to end of training. (per Aarons latest paper, linear is preferred schedule). d - I updated learning rate to 8e-4, in order to provide more visible per iter results to the user assuming debugModel. LR scheduling produces much improved loss curve: <img width="1052" alt="Screenshot 2024-01-28 at 6 39 34 PM" src="https://github.com/pytorch-labs/torchtrain/assets/46302957/667e8520-809f-419e-bfdd-c3bb8f82ff95"> I added two log prints - the warmup schedule as one line, and then a step and current lr at each iter. Both could be disabled if too much info.
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Add debug instructions to the README
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recomputing MoE during backward ``` [rank4]: (Triggered internally at /data/users/whc/pytorch/torch/csrc/autograd/python_anomaly_mode.cpp:122.) [rank4]: return Variable._execution_engine.run_backward( # Calls into the C++ engine to run the backward pass [rank4]:Exception in thread Thread-2 (run_backward): [rank4]:Traceback (most recent call last): [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/_backward.py", line 384, in stage_backward [rank4]: torch.autograd.backward( [rank4]: File "/data/users/whc/pytorch/torch/autograd/__init__.py", line 364, in backward [rank4]: _engine_run_backward( [rank4]: File "/data/users/whc/pytorch/torch/autograd/graph.py", line 865, in _engine_run_backward [rank4]: return Variable._execution_engine.run_backward( # Calls into the C++ engine to run the backward pass [rank4]:RuntimeError: NCCL Error 5: invalid usage (run with NCCL_DEBUG=WARN for details) [rank4]:Exception raised from throw_nccl_error at /data/users/whc/pytorch/torch/csrc/cuda/nccl.cpp:259 (most recent call first): [rank4]:C++ CapturedTraceback: [rank4]:#4 std::_Function_handler<std::shared_ptr<c10::LazyValue<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const> (), c10::SetStackTraceFetcher(std::function< std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > ()>)::{lambda()#1}>::_M_invoke(std::_Any_data const&) from Logging.cpp:0 [rank4]:#5 c10::Error::Error(c10::SourceLocation, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) from ??:0 [rank4]:#6 c10::detail::torchCheckFail(char const*, char const*, unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) from ??:0 [rank4]:#7 torch::cuda::nccl::detail::throw_nccl_error(torch::cuda::nccl::ncclResult) from ??:0 [rank4]:#8 torch::cuda::nccl::detail::NCCL_CHECK_TIMEOUT(torch::cuda::nccl::ncclResult, void*) from nccl.cpp:0 [rank4]:#9 torch::cuda::nccl::all2all_single_unequal_split(void*, unsigned long const*, unsigned long const*, void*, unsigned long const*, unsigned long const*, unsigned long, c10::ScalarType, void* , c10::cuda::CUDAStream&) from ??:0 [rank4]:#10 c10d::ProcessGroupNCCL::alltoall_base(at::Tensor&, at::Tensor&, std::vector<long, std::allocator<long> >&, std::vector<long, std::allocator<long> >&, c10d::AllToAllOptions const&) from ? ?:0 [rank4]:#11 c10d::ops::(anonymous namespace)::alltoall_base_CUDA(at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> >, bool, long) from Ops.cpp:0 [rank4]:#12 c10::impl::make_boxed_from_unboxed_functor<c10::impl::detail::WrapFunctionIntoRuntimeFunctor_<c10::intrusive_ptr<c10d::Work, c10::detail::intrusive_target_default_null_type<c10d::Work> > (*)(at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vec tor<long, std::allocator<long> >, bool, long), c10::intrusive_ptr<c10d::Work, c10::detail::intrusive_target_default_null_type<c10d::Work> >, c10::guts::typelist::typelist<at::Tensor&, at::Tensor&, c 10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> > , bool, long> >, false>::call(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c10::IValue, std::allocator<c10::IValue> >*) from :0 [rank4]:#13 void c10::BoxedKernel::make_boxed_function<&torch::autograd::basicAutogradNotImplementedFallbackImpl>(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c 10::IValue, std::allocator<c10::IValue> >*) from autograd_not_implemented_fallback.cpp:0 [rank4]:#14 c10::impl::BoxedKernelWrapper<c10::intrusive_ptr<c10d::Work, c10::detail::intrusive_target_default_null_type<c10d::Work> > (at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGrou p, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> >, bool, long), void>::call(c10::Box edKernel const&, c10::OperatorHandle const&, c10::DispatchKeySet, at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> >, bool, long) from :0 [rank4]:#15 c10d::ProcessGroup::alltoall_base(at::Tensor&, at::Tensor&, std::vector<long, std::allocator<long> >&, std::vector<long, std::allocator<long> >&, c10d::AllToAllOptions const&) from :0 [rank4]:#16 c10d::all_to_all_single(at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) from ? ?:0 [rank4]:#17 c10::impl::make_boxed_from_unboxed_functor<c10::impl::detail::WrapFunctionIntoRuntimeFunctor_<at::Tensor (*)(at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, st d::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >), at::Tensor, c10::guts::typelist::typelist<at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, s td::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, false>::call(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c10::IValue, std:: allocator<c10::IValue> >*) from :0 [rank4]:#18 void c10::BoxedKernel::make_boxed_function<&torch::autograd::basicAutogradNotImplementedFallbackImpl>(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c 10::IValue, std::allocator<c10::IValue> >*) from autograd_not_implemented_fallback.cpp:0 [rank4]:#19 c10::impl::BoxedKernelWrapper<at::Tensor (at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocat or<char> >), void>::call(c10::BoxedKernel const&, c10::OperatorHandle const&, c10::DispatchKeySet, at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, std::__cxx11::basic_stri ng<char, std::char_traits<char>, std::allocator<char> >) from :0 [rank4]:#20 std::vector<at::Tensor, std::allocator<at::Tensor> > torch::autograd::CppNode_apply_functional<(anonymous namespace)::AllToAllSingle>(std::vector<at::Tensor, std::allocator<at::Tensor> > &&, torch::autograd::AutogradContext&, std::vector<bool, std::allocator<bool> > const&, std::vector<torch::autograd::VariableInfo, std::allocator<torch::autograd::VariableInfo> > const&, std::__cxx1 1::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) from Functional.cpp:0 [rank4]:#21 torch::autograd::CppNode<(anonymous namespace)::AllToAllSingle>::apply(std::vector<at::Tensor, std::allocator<at::Tensor> >&&) from Functional.cpp:0 [rank4]:#22 torch::autograd::Node::operator()(std::vector<at::Tensor, std::allocator<at::Tensor> >&&) from :0 [rank4]:#23 torch::autograd::Engine::evaluate_function(std::shared_ptr<torch::autograd::GraphTask>&, torch::autograd::Node*, torch::autograd::InputBuffer&, std::shared_ptr<torch::autograd::ReadyQueu e> const&) from ??:0 [rank4]:#24 torch::autograd::Engine::thread_main(std::shared_ptr<torch::autograd::GraphTask> const&) from ??:0 [rank4]:#25 torch::autograd::Engine::thread_init(int, std::shared_ptr<torch::autograd::ReadyQueue> const&, bool) from ??:0 [rank4]:#26 torch::autograd::python::PythonEngine::thread_init(int, std::shared_ptr<torch::autograd::ReadyQueue> const&, bool) from :0 [rank4]:#27 std::error_code::default_error_condition() const from ??:0 [rank4]:#28 start_thread from ??:0 [rank4]:#29 __clone3 from :0 [rank4]: [rank4]: [rank4]:The above exception was the direct cause of the following exception: [rank4]: [rank4]:Traceback (most recent call last): [rank4]: File "/home/whc/.conda/envs/pytorch-3.10/lib/python3.10/threading.py", line 1016, in _bootstrap_inner [rank4]: self.run() [rank4]: File "/home/whc/.conda/envs/pytorch-3.10/lib/python3.10/threading.py", line 953, in run [rank4]: self._target(*self._args, **self._kwargs) [rank4]: File "/data/users/whc/torchtitan/torchtitan/distributed/dual_pipe_v.py", line 254, in run_backward [rank4]: backward_stage.backward_one_chunk( [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/stage.py", line 799, in backward_one_chunk [rank4]: grads_input, _ = self.backward_maybe_with_nosync( [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/stage.py", line 653, in backward_maybe_with_nosync [rank4]: result = perform_backward(backward_type)() [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/stage.py", line 607, in <lambda> [rank4]: stage_backward( [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/_backward.py", line 425, in stage_backward [rank4]: raise RuntimeError(exc_msg) from e [rank4]:RuntimeError: [rank4]: Failed to run stage backward: [rank4]: Stage output: ('Tensor(torch.Size([1, 4096, 2048]), grad=True, dtype=torch.bfloat16)',) [rank4]: Output gradient: ('Tensor(torch.Size([1, 4096, 2048]), grad=False, dtype=torch.bfloat16)',) [rank4]: Input: ['Tensor(torch.Size([1, 4096, 2048]), grad=True, dtype=torch.bfloat16)'] ```
H-Huang
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Dec 2, 2025
recomputing MoE during backward ``` [rank4]: (Triggered internally at /data/users/whc/pytorch/torch/csrc/autograd/python_anomaly_mode.cpp:122.) [rank4]: return Variable._execution_engine.run_backward( # Calls into the C++ engine to run the backward pass [rank4]:Exception in thread Thread-2 (run_backward): [rank4]:Traceback (most recent call last): [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/_backward.py", line 384, in stage_backward [rank4]: torch.autograd.backward( [rank4]: File "/data/users/whc/pytorch/torch/autograd/__init__.py", line 364, in backward [rank4]: _engine_run_backward( [rank4]: File "/data/users/whc/pytorch/torch/autograd/graph.py", line 865, in _engine_run_backward [rank4]: return Variable._execution_engine.run_backward( # Calls into the C++ engine to run the backward pass [rank4]:RuntimeError: NCCL Error 5: invalid usage (run with NCCL_DEBUG=WARN for details) [rank4]:Exception raised from throw_nccl_error at /data/users/whc/pytorch/torch/csrc/cuda/nccl.cpp:259 (most recent call first): [rank4]:C++ CapturedTraceback: [rank4]:pytorch#4 std::_Function_handler<std::shared_ptr<c10::LazyValue<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const> (), c10::SetStackTraceFetcher(std::function< std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > ()>)::{lambda()pytorch#1}>::_M_invoke(std::_Any_data const&) from Logging.cpp:0 [rank4]:pytorch#5 c10::Error::Error(c10::SourceLocation, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) from ??:0 [rank4]:pytorch#6 c10::detail::torchCheckFail(char const*, char const*, unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) from ??:0 [rank4]:pytorch#7 torch::cuda::nccl::detail::throw_nccl_error(torch::cuda::nccl::ncclResult) from ??:0 [rank4]:pytorch#8 torch::cuda::nccl::detail::NCCL_CHECK_TIMEOUT(torch::cuda::nccl::ncclResult, void*) from nccl.cpp:0 [rank4]:pytorch#9 torch::cuda::nccl::all2all_single_unequal_split(void*, unsigned long const*, unsigned long const*, void*, unsigned long const*, unsigned long const*, unsigned long, c10::ScalarType, void* , c10::cuda::CUDAStream&) from ??:0 [rank4]:pytorch#10 c10d::ProcessGroupNCCL::alltoall_base(at::Tensor&, at::Tensor&, std::vector<long, std::allocator<long> >&, std::vector<long, std::allocator<long> >&, c10d::AllToAllOptions const&) from ? ?:0 [rank4]:pytorch#11 c10d::ops::(anonymous namespace)::alltoall_base_CUDA(at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> >, bool, long) from Ops.cpp:0 [rank4]:pytorch#12 c10::impl::make_boxed_from_unboxed_functor<c10::impl::detail::WrapFunctionIntoRuntimeFunctor_<c10::intrusive_ptr<c10d::Work, c10::detail::intrusive_target_default_null_type<c10d::Work> > (*)(at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vec tor<long, std::allocator<long> >, bool, long), c10::intrusive_ptr<c10d::Work, c10::detail::intrusive_target_default_null_type<c10d::Work> >, c10::guts::typelist::typelist<at::Tensor&, at::Tensor&, c 10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> > , bool, long> >, false>::call(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c10::IValue, std::allocator<c10::IValue> >*) from :0 [rank4]:pytorch#13 void c10::BoxedKernel::make_boxed_function<&torch::autograd::basicAutogradNotImplementedFallbackImpl>(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c 10::IValue, std::allocator<c10::IValue> >*) from autograd_not_implemented_fallback.cpp:0 [rank4]:pytorch#14 c10::impl::BoxedKernelWrapper<c10::intrusive_ptr<c10d::Work, c10::detail::intrusive_target_default_null_type<c10d::Work> > (at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGrou p, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> >, bool, long), void>::call(c10::Box edKernel const&, c10::OperatorHandle const&, c10::DispatchKeySet, at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> >, bool, long) from :0 [rank4]:pytorch#15 c10d::ProcessGroup::alltoall_base(at::Tensor&, at::Tensor&, std::vector<long, std::allocator<long> >&, std::vector<long, std::allocator<long> >&, c10d::AllToAllOptions const&) from :0 [rank4]:pytorch#16 c10d::all_to_all_single(at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) from ? ?:0 [rank4]:pytorch#17 c10::impl::make_boxed_from_unboxed_functor<c10::impl::detail::WrapFunctionIntoRuntimeFunctor_<at::Tensor (*)(at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, st d::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >), at::Tensor, c10::guts::typelist::typelist<at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, s td::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, false>::call(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c10::IValue, std:: allocator<c10::IValue> >*) from :0 [rank4]:pytorch#18 void c10::BoxedKernel::make_boxed_function<&torch::autograd::basicAutogradNotImplementedFallbackImpl>(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c 10::IValue, std::allocator<c10::IValue> >*) from autograd_not_implemented_fallback.cpp:0 [rank4]:pytorch#19 c10::impl::BoxedKernelWrapper<at::Tensor (at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocat or<char> >), void>::call(c10::BoxedKernel const&, c10::OperatorHandle const&, c10::DispatchKeySet, at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, std::__cxx11::basic_stri ng<char, std::char_traits<char>, std::allocator<char> >) from :0 [rank4]:pytorch#20 std::vector<at::Tensor, std::allocator<at::Tensor> > torch::autograd::CppNode_apply_functional<(anonymous namespace)::AllToAllSingle>(std::vector<at::Tensor, std::allocator<at::Tensor> > &&, torch::autograd::AutogradContext&, std::vector<bool, std::allocator<bool> > const&, std::vector<torch::autograd::VariableInfo, std::allocator<torch::autograd::VariableInfo> > const&, std::__cxx1 1::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) from Functional.cpp:0 [rank4]:pytorch#21 torch::autograd::CppNode<(anonymous namespace)::AllToAllSingle>::apply(std::vector<at::Tensor, std::allocator<at::Tensor> >&&) from Functional.cpp:0 [rank4]:pytorch#22 torch::autograd::Node::operator()(std::vector<at::Tensor, std::allocator<at::Tensor> >&&) from :0 [rank4]:pytorch#23 torch::autograd::Engine::evaluate_function(std::shared_ptr<torch::autograd::GraphTask>&, torch::autograd::Node*, torch::autograd::InputBuffer&, std::shared_ptr<torch::autograd::ReadyQueu e> const&) from ??:0 [rank4]:pytorch#24 torch::autograd::Engine::thread_main(std::shared_ptr<torch::autograd::GraphTask> const&) from ??:0 [rank4]:pytorch#25 torch::autograd::Engine::thread_init(int, std::shared_ptr<torch::autograd::ReadyQueue> const&, bool) from ??:0 [rank4]:pytorch#26 torch::autograd::python::PythonEngine::thread_init(int, std::shared_ptr<torch::autograd::ReadyQueue> const&, bool) from :0 [rank4]:pytorch#27 std::error_code::default_error_condition() const from ??:0 [rank4]:pytorch#28 start_thread from ??:0 [rank4]:pytorch#29 __clone3 from :0 [rank4]: [rank4]: [rank4]:The above exception was the direct cause of the following exception: [rank4]: [rank4]:Traceback (most recent call last): [rank4]: File "/home/whc/.conda/envs/pytorch-3.10/lib/python3.10/threading.py", line 1016, in _bootstrap_inner [rank4]: self.run() [rank4]: File "/home/whc/.conda/envs/pytorch-3.10/lib/python3.10/threading.py", line 953, in run [rank4]: self._target(*self._args, **self._kwargs) [rank4]: File "/data/users/whc/torchtitan/torchtitan/distributed/dual_pipe_v.py", line 254, in run_backward [rank4]: backward_stage.backward_one_chunk( [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/stage.py", line 799, in backward_one_chunk [rank4]: grads_input, _ = self.backward_maybe_with_nosync( [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/stage.py", line 653, in backward_maybe_with_nosync [rank4]: result = perform_backward(backward_type)() [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/stage.py", line 607, in <lambda> [rank4]: stage_backward( [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/_backward.py", line 425, in stage_backward [rank4]: raise RuntimeError(exc_msg) from e [rank4]:RuntimeError: [rank4]: Failed to run stage backward: [rank4]: Stage output: ('Tensor(torch.Size([1, 4096, 2048]), grad=True, dtype=torch.bfloat16)',) [rank4]: Output gradient: ('Tensor(torch.Size([1, 4096, 2048]), grad=False, dtype=torch.bfloat16)',) [rank4]: Input: ['Tensor(torch.Size([1, 4096, 2048]), grad=True, dtype=torch.bfloat16)'] ```
H-Huang
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Dec 17, 2025
recomputing MoE during backward ``` [rank4]: (Triggered internally at /data/users/whc/pytorch/torch/csrc/autograd/python_anomaly_mode.cpp:122.) [rank4]: return Variable._execution_engine.run_backward( # Calls into the C++ engine to run the backward pass [rank4]:Exception in thread Thread-2 (run_backward): [rank4]:Traceback (most recent call last): [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/_backward.py", line 384, in stage_backward [rank4]: torch.autograd.backward( [rank4]: File "/data/users/whc/pytorch/torch/autograd/__init__.py", line 364, in backward [rank4]: _engine_run_backward( [rank4]: File "/data/users/whc/pytorch/torch/autograd/graph.py", line 865, in _engine_run_backward [rank4]: return Variable._execution_engine.run_backward( # Calls into the C++ engine to run the backward pass [rank4]:RuntimeError: NCCL Error 5: invalid usage (run with NCCL_DEBUG=WARN for details) [rank4]:Exception raised from throw_nccl_error at /data/users/whc/pytorch/torch/csrc/cuda/nccl.cpp:259 (most recent call first): [rank4]:C++ CapturedTraceback: [rank4]:pytorch#4 std::_Function_handler<std::shared_ptr<c10::LazyValue<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const> (), c10::SetStackTraceFetcher(std::function< std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > ()>)::{lambda()pytorch#1}>::_M_invoke(std::_Any_data const&) from Logging.cpp:0 [rank4]:pytorch#5 c10::Error::Error(c10::SourceLocation, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) from ??:0 [rank4]:pytorch#6 c10::detail::torchCheckFail(char const*, char const*, unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) from ??:0 [rank4]:pytorch#7 torch::cuda::nccl::detail::throw_nccl_error(torch::cuda::nccl::ncclResult) from ??:0 [rank4]:pytorch#8 torch::cuda::nccl::detail::NCCL_CHECK_TIMEOUT(torch::cuda::nccl::ncclResult, void*) from nccl.cpp:0 [rank4]:pytorch#9 torch::cuda::nccl::all2all_single_unequal_split(void*, unsigned long const*, unsigned long const*, void*, unsigned long const*, unsigned long const*, unsigned long, c10::ScalarType, void* , c10::cuda::CUDAStream&) from ??:0 [rank4]:pytorch#10 c10d::ProcessGroupNCCL::alltoall_base(at::Tensor&, at::Tensor&, std::vector<long, std::allocator<long> >&, std::vector<long, std::allocator<long> >&, c10d::AllToAllOptions const&) from ? ?:0 [rank4]:pytorch#11 c10d::ops::(anonymous namespace)::alltoall_base_CUDA(at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> >, bool, long) from Ops.cpp:0 [rank4]:pytorch#12 c10::impl::make_boxed_from_unboxed_functor<c10::impl::detail::WrapFunctionIntoRuntimeFunctor_<c10::intrusive_ptr<c10d::Work, c10::detail::intrusive_target_default_null_type<c10d::Work> > (*)(at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vec tor<long, std::allocator<long> >, bool, long), c10::intrusive_ptr<c10d::Work, c10::detail::intrusive_target_default_null_type<c10d::Work> >, c10::guts::typelist::typelist<at::Tensor&, at::Tensor&, c 10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> > , bool, long> >, false>::call(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c10::IValue, std::allocator<c10::IValue> >*) from :0 [rank4]:pytorch#13 void c10::BoxedKernel::make_boxed_function<&torch::autograd::basicAutogradNotImplementedFallbackImpl>(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c 10::IValue, std::allocator<c10::IValue> >*) from autograd_not_implemented_fallback.cpp:0 [rank4]:pytorch#14 c10::impl::BoxedKernelWrapper<c10::intrusive_ptr<c10d::Work, c10::detail::intrusive_target_default_null_type<c10d::Work> > (at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGrou p, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> >, bool, long), void>::call(c10::Box edKernel const&, c10::OperatorHandle const&, c10::DispatchKeySet, at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> >, bool, long) from :0 [rank4]:pytorch#15 c10d::ProcessGroup::alltoall_base(at::Tensor&, at::Tensor&, std::vector<long, std::allocator<long> >&, std::vector<long, std::allocator<long> >&, c10d::AllToAllOptions const&) from :0 [rank4]:pytorch#16 c10d::all_to_all_single(at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) from ? ?:0 [rank4]:pytorch#17 c10::impl::make_boxed_from_unboxed_functor<c10::impl::detail::WrapFunctionIntoRuntimeFunctor_<at::Tensor (*)(at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, st d::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >), at::Tensor, c10::guts::typelist::typelist<at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, s td::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, false>::call(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c10::IValue, std:: allocator<c10::IValue> >*) from :0 [rank4]:pytorch#18 void c10::BoxedKernel::make_boxed_function<&torch::autograd::basicAutogradNotImplementedFallbackImpl>(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c 10::IValue, std::allocator<c10::IValue> >*) from autograd_not_implemented_fallback.cpp:0 [rank4]:pytorch#19 c10::impl::BoxedKernelWrapper<at::Tensor (at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocat or<char> >), void>::call(c10::BoxedKernel const&, c10::OperatorHandle const&, c10::DispatchKeySet, at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, std::__cxx11::basic_stri ng<char, std::char_traits<char>, std::allocator<char> >) from :0 [rank4]:pytorch#20 std::vector<at::Tensor, std::allocator<at::Tensor> > torch::autograd::CppNode_apply_functional<(anonymous namespace)::AllToAllSingle>(std::vector<at::Tensor, std::allocator<at::Tensor> > &&, torch::autograd::AutogradContext&, std::vector<bool, std::allocator<bool> > const&, std::vector<torch::autograd::VariableInfo, std::allocator<torch::autograd::VariableInfo> > const&, std::__cxx1 1::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) from Functional.cpp:0 [rank4]:pytorch#21 torch::autograd::CppNode<(anonymous namespace)::AllToAllSingle>::apply(std::vector<at::Tensor, std::allocator<at::Tensor> >&&) from Functional.cpp:0 [rank4]:pytorch#22 torch::autograd::Node::operator()(std::vector<at::Tensor, std::allocator<at::Tensor> >&&) from :0 [rank4]:pytorch#23 torch::autograd::Engine::evaluate_function(std::shared_ptr<torch::autograd::GraphTask>&, torch::autograd::Node*, torch::autograd::InputBuffer&, std::shared_ptr<torch::autograd::ReadyQueu e> const&) from ??:0 [rank4]:pytorch#24 torch::autograd::Engine::thread_main(std::shared_ptr<torch::autograd::GraphTask> const&) from ??:0 [rank4]:pytorch#25 torch::autograd::Engine::thread_init(int, std::shared_ptr<torch::autograd::ReadyQueue> const&, bool) from ??:0 [rank4]:pytorch#26 torch::autograd::python::PythonEngine::thread_init(int, std::shared_ptr<torch::autograd::ReadyQueue> const&, bool) from :0 [rank4]:pytorch#27 std::error_code::default_error_condition() const from ??:0 [rank4]:pytorch#28 start_thread from ??:0 [rank4]:pytorch#29 __clone3 from :0 [rank4]: [rank4]: [rank4]:The above exception was the direct cause of the following exception: [rank4]: [rank4]:Traceback (most recent call last): [rank4]: File "/home/whc/.conda/envs/pytorch-3.10/lib/python3.10/threading.py", line 1016, in _bootstrap_inner [rank4]: self.run() [rank4]: File "/home/whc/.conda/envs/pytorch-3.10/lib/python3.10/threading.py", line 953, in run [rank4]: self._target(*self._args, **self._kwargs) [rank4]: File "/data/users/whc/torchtitan/torchtitan/distributed/dual_pipe_v.py", line 254, in run_backward [rank4]: backward_stage.backward_one_chunk( [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/stage.py", line 799, in backward_one_chunk [rank4]: grads_input, _ = self.backward_maybe_with_nosync( [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/stage.py", line 653, in backward_maybe_with_nosync [rank4]: result = perform_backward(backward_type)() [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/stage.py", line 607, in <lambda> [rank4]: stage_backward( [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/_backward.py", line 425, in stage_backward [rank4]: raise RuntimeError(exc_msg) from e [rank4]:RuntimeError: [rank4]: Failed to run stage backward: [rank4]: Stage output: ('Tensor(torch.Size([1, 4096, 2048]), grad=True, dtype=torch.bfloat16)',) [rank4]: Output gradient: ('Tensor(torch.Size([1, 4096, 2048]), grad=False, dtype=torch.bfloat16)',) [rank4]: Input: ['Tensor(torch.Size([1, 4096, 2048]), grad=True, dtype=torch.bfloat16)'] ```
H-Huang
pushed a commit
to H-Huang/torchtitan
that referenced
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Dec 17, 2025
recomputing MoE during backward ``` [rank4]: (Triggered internally at /data/users/whc/pytorch/torch/csrc/autograd/python_anomaly_mode.cpp:122.) [rank4]: return Variable._execution_engine.run_backward( # Calls into the C++ engine to run the backward pass [rank4]:Exception in thread Thread-2 (run_backward): [rank4]:Traceback (most recent call last): [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/_backward.py", line 384, in stage_backward [rank4]: torch.autograd.backward( [rank4]: File "/data/users/whc/pytorch/torch/autograd/__init__.py", line 364, in backward [rank4]: _engine_run_backward( [rank4]: File "/data/users/whc/pytorch/torch/autograd/graph.py", line 865, in _engine_run_backward [rank4]: return Variable._execution_engine.run_backward( # Calls into the C++ engine to run the backward pass [rank4]:RuntimeError: NCCL Error 5: invalid usage (run with NCCL_DEBUG=WARN for details) [rank4]:Exception raised from throw_nccl_error at /data/users/whc/pytorch/torch/csrc/cuda/nccl.cpp:259 (most recent call first): [rank4]:C++ CapturedTraceback: [rank4]:pytorch#4 std::_Function_handler<std::shared_ptr<c10::LazyValue<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const> (), c10::SetStackTraceFetcher(std::function< std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > ()>)::{lambda()pytorch#1}>::_M_invoke(std::_Any_data const&) from Logging.cpp:0 [rank4]:pytorch#5 c10::Error::Error(c10::SourceLocation, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) from ??:0 [rank4]:pytorch#6 c10::detail::torchCheckFail(char const*, char const*, unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) from ??:0 [rank4]:pytorch#7 torch::cuda::nccl::detail::throw_nccl_error(torch::cuda::nccl::ncclResult) from ??:0 [rank4]:pytorch#8 torch::cuda::nccl::detail::NCCL_CHECK_TIMEOUT(torch::cuda::nccl::ncclResult, void*) from nccl.cpp:0 [rank4]:pytorch#9 torch::cuda::nccl::all2all_single_unequal_split(void*, unsigned long const*, unsigned long const*, void*, unsigned long const*, unsigned long const*, unsigned long, c10::ScalarType, void* , c10::cuda::CUDAStream&) from ??:0 [rank4]:pytorch#10 c10d::ProcessGroupNCCL::alltoall_base(at::Tensor&, at::Tensor&, std::vector<long, std::allocator<long> >&, std::vector<long, std::allocator<long> >&, c10d::AllToAllOptions const&) from ? ?:0 [rank4]:pytorch#11 c10d::ops::(anonymous namespace)::alltoall_base_CUDA(at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> >, bool, long) from Ops.cpp:0 [rank4]:pytorch#12 c10::impl::make_boxed_from_unboxed_functor<c10::impl::detail::WrapFunctionIntoRuntimeFunctor_<c10::intrusive_ptr<c10d::Work, c10::detail::intrusive_target_default_null_type<c10d::Work> > (*)(at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vec tor<long, std::allocator<long> >, bool, long), c10::intrusive_ptr<c10d::Work, c10::detail::intrusive_target_default_null_type<c10d::Work> >, c10::guts::typelist::typelist<at::Tensor&, at::Tensor&, c 10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> > , bool, long> >, false>::call(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c10::IValue, std::allocator<c10::IValue> >*) from :0 [rank4]:pytorch#13 void c10::BoxedKernel::make_boxed_function<&torch::autograd::basicAutogradNotImplementedFallbackImpl>(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c 10::IValue, std::allocator<c10::IValue> >*) from autograd_not_implemented_fallback.cpp:0 [rank4]:pytorch#14 c10::impl::BoxedKernelWrapper<c10::intrusive_ptr<c10d::Work, c10::detail::intrusive_target_default_null_type<c10d::Work> > (at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGrou p, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> >, bool, long), void>::call(c10::Box edKernel const&, c10::OperatorHandle const&, c10::DispatchKeySet, at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> >, bool, long) from :0 [rank4]:pytorch#15 c10d::ProcessGroup::alltoall_base(at::Tensor&, at::Tensor&, std::vector<long, std::allocator<long> >&, std::vector<long, std::allocator<long> >&, c10d::AllToAllOptions const&) from :0 [rank4]:pytorch#16 c10d::all_to_all_single(at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) from ? ?:0 [rank4]:pytorch#17 c10::impl::make_boxed_from_unboxed_functor<c10::impl::detail::WrapFunctionIntoRuntimeFunctor_<at::Tensor (*)(at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, st d::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >), at::Tensor, c10::guts::typelist::typelist<at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, s td::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, false>::call(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c10::IValue, std:: allocator<c10::IValue> >*) from :0 [rank4]:pytorch#18 void c10::BoxedKernel::make_boxed_function<&torch::autograd::basicAutogradNotImplementedFallbackImpl>(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c 10::IValue, std::allocator<c10::IValue> >*) from autograd_not_implemented_fallback.cpp:0 [rank4]:pytorch#19 c10::impl::BoxedKernelWrapper<at::Tensor (at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocat or<char> >), void>::call(c10::BoxedKernel const&, c10::OperatorHandle const&, c10::DispatchKeySet, at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, std::__cxx11::basic_stri ng<char, std::char_traits<char>, std::allocator<char> >) from :0 [rank4]:pytorch#20 std::vector<at::Tensor, std::allocator<at::Tensor> > torch::autograd::CppNode_apply_functional<(anonymous namespace)::AllToAllSingle>(std::vector<at::Tensor, std::allocator<at::Tensor> > &&, torch::autograd::AutogradContext&, std::vector<bool, std::allocator<bool> > const&, std::vector<torch::autograd::VariableInfo, std::allocator<torch::autograd::VariableInfo> > const&, std::__cxx1 1::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) from Functional.cpp:0 [rank4]:pytorch#21 torch::autograd::CppNode<(anonymous namespace)::AllToAllSingle>::apply(std::vector<at::Tensor, std::allocator<at::Tensor> >&&) from Functional.cpp:0 [rank4]:pytorch#22 torch::autograd::Node::operator()(std::vector<at::Tensor, std::allocator<at::Tensor> >&&) from :0 [rank4]:pytorch#23 torch::autograd::Engine::evaluate_function(std::shared_ptr<torch::autograd::GraphTask>&, torch::autograd::Node*, torch::autograd::InputBuffer&, std::shared_ptr<torch::autograd::ReadyQueu e> const&) from ??:0 [rank4]:pytorch#24 torch::autograd::Engine::thread_main(std::shared_ptr<torch::autograd::GraphTask> const&) from ??:0 [rank4]:pytorch#25 torch::autograd::Engine::thread_init(int, std::shared_ptr<torch::autograd::ReadyQueue> const&, bool) from ??:0 [rank4]:pytorch#26 torch::autograd::python::PythonEngine::thread_init(int, std::shared_ptr<torch::autograd::ReadyQueue> const&, bool) from :0 [rank4]:pytorch#27 std::error_code::default_error_condition() const from ??:0 [rank4]:pytorch#28 start_thread from ??:0 [rank4]:pytorch#29 __clone3 from :0 [rank4]: [rank4]: [rank4]:The above exception was the direct cause of the following exception: [rank4]: [rank4]:Traceback (most recent call last): [rank4]: File "/home/whc/.conda/envs/pytorch-3.10/lib/python3.10/threading.py", line 1016, in _bootstrap_inner [rank4]: self.run() [rank4]: File "/home/whc/.conda/envs/pytorch-3.10/lib/python3.10/threading.py", line 953, in run [rank4]: self._target(*self._args, **self._kwargs) [rank4]: File "/data/users/whc/torchtitan/torchtitan/distributed/dual_pipe_v.py", line 254, in run_backward [rank4]: backward_stage.backward_one_chunk( [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/stage.py", line 799, in backward_one_chunk [rank4]: grads_input, _ = self.backward_maybe_with_nosync( [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/stage.py", line 653, in backward_maybe_with_nosync [rank4]: result = perform_backward(backward_type)() [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/stage.py", line 607, in <lambda> [rank4]: stage_backward( [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/_backward.py", line 425, in stage_backward [rank4]: raise RuntimeError(exc_msg) from e [rank4]:RuntimeError: [rank4]: Failed to run stage backward: [rank4]: Stage output: ('Tensor(torch.Size([1, 4096, 2048]), grad=True, dtype=torch.bfloat16)',) [rank4]: Output gradient: ('Tensor(torch.Size([1, 4096, 2048]), grad=False, dtype=torch.bfloat16)',) [rank4]: Input: ['Tensor(torch.Size([1, 4096, 2048]), grad=True, dtype=torch.bfloat16)'] ```
H-Huang
pushed a commit
to H-Huang/torchtitan
that referenced
this pull request
Jan 22, 2026
recomputing MoE during backward ``` [rank4]: (Triggered internally at /data/users/whc/pytorch/torch/csrc/autograd/python_anomaly_mode.cpp:122.) [rank4]: return Variable._execution_engine.run_backward( # Calls into the C++ engine to run the backward pass [rank4]:Exception in thread Thread-2 (run_backward): [rank4]:Traceback (most recent call last): [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/_backward.py", line 384, in stage_backward [rank4]: torch.autograd.backward( [rank4]: File "/data/users/whc/pytorch/torch/autograd/__init__.py", line 364, in backward [rank4]: _engine_run_backward( [rank4]: File "/data/users/whc/pytorch/torch/autograd/graph.py", line 865, in _engine_run_backward [rank4]: return Variable._execution_engine.run_backward( # Calls into the C++ engine to run the backward pass [rank4]:RuntimeError: NCCL Error 5: invalid usage (run with NCCL_DEBUG=WARN for details) [rank4]:Exception raised from throw_nccl_error at /data/users/whc/pytorch/torch/csrc/cuda/nccl.cpp:259 (most recent call first): [rank4]:C++ CapturedTraceback: [rank4]:pytorch#4 std::_Function_handler<std::shared_ptr<c10::LazyValue<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const> (), c10::SetStackTraceFetcher(std::function< std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > ()>)::{lambda()pytorch#1}>::_M_invoke(std::_Any_data const&) from Logging.cpp:0 [rank4]:pytorch#5 c10::Error::Error(c10::SourceLocation, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) from ??:0 [rank4]:pytorch#6 c10::detail::torchCheckFail(char const*, char const*, unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) from ??:0 [rank4]:pytorch#7 torch::cuda::nccl::detail::throw_nccl_error(torch::cuda::nccl::ncclResult) from ??:0 [rank4]:pytorch#8 torch::cuda::nccl::detail::NCCL_CHECK_TIMEOUT(torch::cuda::nccl::ncclResult, void*) from nccl.cpp:0 [rank4]:pytorch#9 torch::cuda::nccl::all2all_single_unequal_split(void*, unsigned long const*, unsigned long const*, void*, unsigned long const*, unsigned long const*, unsigned long, c10::ScalarType, void* , c10::cuda::CUDAStream&) from ??:0 [rank4]:pytorch#10 c10d::ProcessGroupNCCL::alltoall_base(at::Tensor&, at::Tensor&, std::vector<long, std::allocator<long> >&, std::vector<long, std::allocator<long> >&, c10d::AllToAllOptions const&) from ? ?:0 [rank4]:pytorch#11 c10d::ops::(anonymous namespace)::alltoall_base_CUDA(at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> >, bool, long) from Ops.cpp:0 [rank4]:pytorch#12 c10::impl::make_boxed_from_unboxed_functor<c10::impl::detail::WrapFunctionIntoRuntimeFunctor_<c10::intrusive_ptr<c10d::Work, c10::detail::intrusive_target_default_null_type<c10d::Work> > (*)(at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vec tor<long, std::allocator<long> >, bool, long), c10::intrusive_ptr<c10d::Work, c10::detail::intrusive_target_default_null_type<c10d::Work> >, c10::guts::typelist::typelist<at::Tensor&, at::Tensor&, c 10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> > , bool, long> >, false>::call(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c10::IValue, std::allocator<c10::IValue> >*) from :0 [rank4]:pytorch#13 void c10::BoxedKernel::make_boxed_function<&torch::autograd::basicAutogradNotImplementedFallbackImpl>(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c 10::IValue, std::allocator<c10::IValue> >*) from autograd_not_implemented_fallback.cpp:0 [rank4]:pytorch#14 c10::impl::BoxedKernelWrapper<c10::intrusive_ptr<c10d::Work, c10::detail::intrusive_target_default_null_type<c10d::Work> > (at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGrou p, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> >, bool, long), void>::call(c10::Box edKernel const&, c10::OperatorHandle const&, c10::DispatchKeySet, at::Tensor&, at::Tensor&, c10::intrusive_ptr<c10d::ProcessGroup, c10::detail::intrusive_target_default_null_type<c10d::ProcessGroup> > const&, std::vector<long, std::allocator<long> >, std::vector<long, std::allocator<long> >, bool, long) from :0 [rank4]:pytorch#15 c10d::ProcessGroup::alltoall_base(at::Tensor&, at::Tensor&, std::vector<long, std::allocator<long> >&, std::vector<long, std::allocator<long> >&, c10d::AllToAllOptions const&) from :0 [rank4]:pytorch#16 c10d::all_to_all_single(at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) from ? ?:0 [rank4]:pytorch#17 c10::impl::make_boxed_from_unboxed_functor<c10::impl::detail::WrapFunctionIntoRuntimeFunctor_<at::Tensor (*)(at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, st d::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >), at::Tensor, c10::guts::typelist::typelist<at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, s td::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, false>::call(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c10::IValue, std:: allocator<c10::IValue> >*) from :0 [rank4]:pytorch#18 void c10::BoxedKernel::make_boxed_function<&torch::autograd::basicAutogradNotImplementedFallbackImpl>(c10::OperatorKernel*, c10::OperatorHandle const&, c10::DispatchKeySet, std::vector<c 10::IValue, std::allocator<c10::IValue> >*) from autograd_not_implemented_fallback.cpp:0 [rank4]:pytorch#19 c10::impl::BoxedKernelWrapper<at::Tensor (at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocat or<char> >), void>::call(c10::BoxedKernel const&, c10::OperatorHandle const&, c10::DispatchKeySet, at::Tensor const&, c10::ArrayRef<c10::SymInt>, c10::ArrayRef<c10::SymInt>, std::__cxx11::basic_stri ng<char, std::char_traits<char>, std::allocator<char> >) from :0 [rank4]:pytorch#20 std::vector<at::Tensor, std::allocator<at::Tensor> > torch::autograd::CppNode_apply_functional<(anonymous namespace)::AllToAllSingle>(std::vector<at::Tensor, std::allocator<at::Tensor> > &&, torch::autograd::AutogradContext&, std::vector<bool, std::allocator<bool> > const&, std::vector<torch::autograd::VariableInfo, std::allocator<torch::autograd::VariableInfo> > const&, std::__cxx1 1::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) from Functional.cpp:0 [rank4]:pytorch#21 torch::autograd::CppNode<(anonymous namespace)::AllToAllSingle>::apply(std::vector<at::Tensor, std::allocator<at::Tensor> >&&) from Functional.cpp:0 [rank4]:pytorch#22 torch::autograd::Node::operator()(std::vector<at::Tensor, std::allocator<at::Tensor> >&&) from :0 [rank4]:pytorch#23 torch::autograd::Engine::evaluate_function(std::shared_ptr<torch::autograd::GraphTask>&, torch::autograd::Node*, torch::autograd::InputBuffer&, std::shared_ptr<torch::autograd::ReadyQueu e> const&) from ??:0 [rank4]:pytorch#24 torch::autograd::Engine::thread_main(std::shared_ptr<torch::autograd::GraphTask> const&) from ??:0 [rank4]:pytorch#25 torch::autograd::Engine::thread_init(int, std::shared_ptr<torch::autograd::ReadyQueue> const&, bool) from ??:0 [rank4]:pytorch#26 torch::autograd::python::PythonEngine::thread_init(int, std::shared_ptr<torch::autograd::ReadyQueue> const&, bool) from :0 [rank4]:pytorch#27 std::error_code::default_error_condition() const from ??:0 [rank4]:pytorch#28 start_thread from ??:0 [rank4]:pytorch#29 __clone3 from :0 [rank4]: [rank4]: [rank4]:The above exception was the direct cause of the following exception: [rank4]: [rank4]:Traceback (most recent call last): [rank4]: File "/home/whc/.conda/envs/pytorch-3.10/lib/python3.10/threading.py", line 1016, in _bootstrap_inner [rank4]: self.run() [rank4]: File "/home/whc/.conda/envs/pytorch-3.10/lib/python3.10/threading.py", line 953, in run [rank4]: self._target(*self._args, **self._kwargs) [rank4]: File "/data/users/whc/torchtitan/torchtitan/distributed/dual_pipe_v.py", line 254, in run_backward [rank4]: backward_stage.backward_one_chunk( [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/stage.py", line 799, in backward_one_chunk [rank4]: grads_input, _ = self.backward_maybe_with_nosync( [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/stage.py", line 653, in backward_maybe_with_nosync [rank4]: result = perform_backward(backward_type)() [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/stage.py", line 607, in <lambda> [rank4]: stage_backward( [rank4]: File "/data/users/whc/pytorch/torch/distributed/pipelining/_backward.py", line 425, in stage_backward [rank4]: raise RuntimeError(exc_msg) from e [rank4]:RuntimeError: [rank4]: Failed to run stage backward: [rank4]: Stage output: ('Tensor(torch.Size([1, 4096, 2048]), grad=True, dtype=torch.bfloat16)',) [rank4]: Output gradient: ('Tensor(torch.Size([1, 4096, 2048]), grad=False, dtype=torch.bfloat16)',) [rank4]: Input: ['Tensor(torch.Size([1, 4096, 2048]), grad=True, dtype=torch.bfloat16)'] ```
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this PR adds a linear lr scheduler and includes some automation based on current best practices:
a - takes user lr provided in args as lr_max, and computes final min_lr for the decay schedule based on lr / 10, per chinchilla paper. (i.e. total decay will be one order of magnitude).
b - computes an automated linear warmup schedule of 10% total iters as warmup, with min warmup of 2 steps.
c - computes a linear decay schedule after warmup, declining from lr_max to lr_min over the end of warmup to end of training. (per Aarons latest paper, linear is preferred schedule).
d - I updated learning rate to 8e-4, in order to provide more visible per iter results to the user assuming debugModel.
LR scheduling produces much improved loss curve:
I added two log prints - the warmup schedule as one line, and then a step and current lr at each iter.
Both could be disabled if too much info.