[Fix] Fix bug of chunk_loss when backward with the froze lm_head
#1458
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This was referenced Jan 28, 2026
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HAOCHENYE
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`torch.autograd.grad` will raise an error if any tensor of `input` does not require gradient, e.g, the frozen `lm_head`. This commit just fix it with a simple control flow. ghstack-source-id: 10ade62 Pull-Request: InternLM#1458
HAOCHENYE
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Jan 28, 2026
`torch.autograd.grad` will raise an error if any tensor of `input` does not require gradient, e.g, the frozen `lm_head`. This commit just fix it with a simple control flow. ghstack-source-id: 10ade62 Pull-Request: InternLM#1458
HAOCHENYE
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Jan 28, 2026
`torch.autograd.grad` will raise an error if any tensor of `input` does not require gradient, e.g, the frozen `lm_head`. This commit just fix it with a simple control flow. ghstack-source-id: 70be6dd Pull-Request: InternLM#1458
HAOCHENYE
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Jan 28, 2026
`torch.autograd.grad` will raise an error if any tensor of `input` does not require gradient, e.g, the frozen `lm_head`. This commit just fix it with a simple control flow. ghstack-source-id: be56a30 Pull-Request: InternLM#1458
HAOCHENYE
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Jan 28, 2026
`torch.autograd.grad` will raise an error if any tensor of `input` does not require gradient, e.g, the frozen `lm_head`. This commit just fix it with a simple control flow. ghstack-source-id: ec3804f Pull-Request: InternLM#1458
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Stack from ghstack (oldest at bottom):
fullyshard in BaseModel` #1460chunk_losswhen backward with the frozelm_head#1458XTunerBaseModelConfig#1456DataloaderConfig#1454clean_param_name#1452SequenceContext#1451float8_handlerinfully_shared#1450torch.autograd.gradwill raise an error if any tensor ofinputdoesnot require gradient, e.g, the frozen
lm_head. This commit just fixit with a simple control flow.