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Revert "[LayerNorm] Don't store x + residual if we don't need gradients"

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This reverts commit 800401847e.
This commit is contained in:
Tri Dao 2024-08-15 12:02:39 -07:00
parent 800401847e
commit bd82d6c6eb
1 changed files with 1 additions and 8 deletions
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9
flash_attn/ops/triton/layer_norm.py
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@ -307,14 +307,7 @@ def _layer_norm_fwd(
or dropout_p > 0.0
or rowscale is not None
or x1 is not None
) and (
x.requires_grad
or weight.requires_grad
or (bias is not None and bias.requires_grad)
or (residual is not None and residual.requires_grad)
or (x1 is not None and x1.requires_grad)
or (weight1 is not None and weight1.requires_grad)
or (bias1 is not None and bias1.requires_grad)):
):
residual_out = torch.empty(
M, N, device=x.device, dtype=residual_dtype if residual_dtype is not None else x.dtype
)