Finish adding support for torch.compile dynamic shapes (#30919)

add torch.compile dynamic support

src/transformers/models/dbrx/modeling_dbrx.py

@@ -615,13 +615,17 @@ class DbrxSdpaAttention(DbrxAttention):
             key_states = key_states.contiguous()
             value_states = value_states.contiguous()
 
+        # We dispatch to SDPA's Flash Attention or Efficient kernels via this `is_causal` if statement instead of an inline conditional assignment
+        # in SDPA to support both torch.compile's dynamic shapes and full graph options. An inline conditional prevents dynamic shapes from compiling.
+        is_causal = True if causal_mask is None and q_len > 1 else False
+
         attn_output = torch.nn.functional.scaled_dot_product_attention(
             query_states,
             key_states,
             value_states,
             attn_mask=causal_mask,
             dropout_p=self.attn_pdrop if self.training else 0.0,
-            is_causal=causal_mask is None and q_len > 1,
+            is_causal=is_causal,
         )
 
         attn_output = attn_output.transpose(1, 2).contiguous()

src/transformers/models/jamba/modeling_jamba.py

@@ -725,14 +725,18 @@ class JambaSdpaAttention(JambaAttention):
             key_states = key_states.contiguous()
             value_states = value_states.contiguous()
 
+        # We dispatch to SDPA's Flash Attention or Efficient kernels via this `is_causal` if statement instead of an inline conditional assignment
+        # in SDPA to support both torch.compile's dynamic shapes and full graph options. An inline conditional prevents dynamic shapes from compiling.
+        # The q_len > 1 is necessary to match with AttentionMaskConverter.to_causal_4d that does not create a causal mask in case q_len == 1.
+        is_causal = True if self.is_causal and causal_mask is None and q_len > 1 else False
+
         attn_output = torch.nn.functional.scaled_dot_product_attention(
             query_states,
             key_states,
             value_states,
             attn_mask=causal_mask,
             dropout_p=self.attention_dropout if self.training else 0.0,
-            # The q_len > 1 is necessary to match with AttentionMaskConverter.to_causal_4d that does not create a causal mask in case q_len == 1.
-            is_causal=self.is_causal and attention_mask is None and q_len > 1,
+            is_causal=is_causal,
         )
 
         attn_output = attn_output.transpose(1, 2).contiguous()

src/transformers/models/jetmoe/modeling_jetmoe.py

@@ -624,15 +624,17 @@ class JetMoeSdpaAttention(JetMoeAttention):
             key_states = key_states.contiguous()
             value_states = value_states.contiguous()
 
-        # In case we are not compiling, we may set `causal_mask` to None, which is required to dispatch to SDPA's Flash Attention 2 backend, rather
-        # relying on the `is_causal` argument.
+        # We dispatch to SDPA's Flash Attention or Efficient kernels via this `is_causal` if statement instead of an inline conditional assignment
+        # in SDPA to support both torch.compile's dynamic shapes and full graph options. An inline conditional prevents dynamic shapes from compiling.
+        is_causal = True if causal_mask is None and q_len > 1 else False
+
         attn_output = torch.nn.functional.scaled_dot_product_attention(
             query_states,
             key_states,
             value_states,
             attn_mask=causal_mask,
             dropout_p=self.attention_dropout if self.training else 0.0,
-            is_causal=causal_mask is None and q_len > 1,
+            is_causal=is_causal,
         )
 
         attn_output = attn_output.transpose(1, 2).contiguous()