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grad is none when run gpt2 with pipeline parallelism only #204

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grad is none when run gpt2 with pipeline parallelism only#204
@lin88lin8850

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@lin88lin8850
lin88lin8850
opened on Dec 22, 2022

🐛 Describe the bug

image

Environment

torch==1.12.0a0+8a1a93a
num_gpu=4
pipeline=4
model = gpt2-small

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