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Fix new FA2 if is_causal is passed explicitly #35390

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merged 3 commits into from
Dec 22, 2024
Merged

Fix new FA2 if is_causal is passed explicitly #35390

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9f4de68
fix
Cyrilvallez Dec 22, 2024
a44be4c
Update modeling_decision_transformer.py
Cyrilvallez Dec 22, 2024
2ea3371
Update flash_attention.py
Cyrilvallez Dec 22, 2024
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3 changes: 3 additions & 0 deletions src/transformers/integrations/flash_attention.py
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,9 @@ def flash_attention_forward(
else:
target_dtype = next(layer for layer in module.modules() if isinstance(layer, torch.nn.Linear)).weight.dtype

# FA2 always relies on the value set in the module, so remove it if present in kwargs to avoid passing it twice
kwargs.pop("is_causal", None)

attn_output = _flash_attention_forward(
query,
key,
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6 changes: 3 additions & 3 deletions src/transformers/models/decision_transformer/modeling_decision_transformer.py
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Expand Up @@ -285,9 +285,9 @@ def forward(
shape_q = (*query_states.shape[:-1], -1, self.head_dim)
shape_kv = (*key_states.shape[:-1], -1, self.head_dim)

query_states = query_states.reshape(shape_q).transpose(1, 2)
key_states = key_states.reshape(shape_kv).transpose(1, 2)
value_states = value_states.reshape(shape_kv).transpose(1, 2)
query_states = query_states.view(shape_q).transpose(1, 2)
key_states = key_states.view(shape_kv).transpose(1, 2)
value_states = value_states.view(shape_kv).transpose(1, 2)

if layer_past is not None:
past_key, past_value = layer_past
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6 changes: 3 additions & 3 deletions src/transformers/models/gpt2/modeling_gpt2.py
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Original file line number Diff line number Diff line change
Expand Up @@ -295,9 +295,9 @@ def forward(
shape_q = (*query_states.shape[:-1], -1, self.head_dim)
shape_kv = (*key_states.shape[:-1], -1, self.head_dim)

query_states = query_states.reshape(shape_q).transpose(1, 2)
key_states = key_states.reshape(shape_kv).transpose(1, 2)
value_states = value_states.reshape(shape_kv).transpose(1, 2)
query_states = query_states.view(shape_q).transpose(1, 2)
key_states = key_states.view(shape_kv).transpose(1, 2)
value_states = value_states.view(shape_kv).transpose(1, 2)

if layer_past is not None:
past_key, past_value = layer_past
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