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[Main] Add the missing part to support 1F1B overlap for Qwen3-Next #2997

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Merged
Phlip79 merged 1 commit into from
Feb 4, 2026
Merged

[Main] Add the missing part to support 1F1B overlap for Qwen3-Next #2997

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13 changes: 13 additions & 0 deletions megatron/core/ssm/gated_delta_net.py
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Original file line number Diff line number Diff line change
Expand Up @@ -508,6 +508,19 @@ def sharded_state_dict(self, prefix="", sharded_offsets=(), metadata=None, tp_gr

return sharded_state_dict

def backward_dw(self):
"""Execute weight gradient computation for all linear layers."""
self._backward_in_proj()
self._backward_out_proj()

def _backward_in_proj(self):
"""Computes weight gradients of input projection layer."""
self.in_proj.backward_dw()

def _backward_out_proj(self):
"""Computes weight gradients of output projection layer."""
self.out_proj.backward_dw()


def _split_tensor_factory(
orig_sh_ten: ShardedTensor, split_sections: List[int], split_names: List[str], split_dim: int
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