fix rotary_emb for llama (#8470)

Author: EnflameGCU

paddlenlp/transformers/llama/fusion_ops.py

@@ -57,11 +57,13 @@ def fusion_rope(query_states, key_states, value_states, hidden_states, position_
         assert past_key_value is None, "fuse rotary not support cache kv for now"
     batch_size, seq_length, num_heads, head_dim = query_states.shape
     _, kv_seq_len, num_key_value_heads, _ = key_states.shape
-    cos, sin, cos_sin = rotary_emb(value_states, seq_len=kv_seq_len)
+    if get_env_device() != "gcu":
+        cos, sin = rotary_emb(value_states, seq_len=kv_seq_len)
     if get_env_device() == "npu":
         query_states = core.eager._run_custom_op("fused_rope", query_states, cos, sin)[0]
         key_states = core.eager._run_custom_op("fused_rope", key_states, cos, sin)[0]
     elif get_env_device() == "gcu":
+        cos_sin = rotary_emb.get_fused_cos_sin(value_states, seq_len=kv_seq_len)
         query_states, key_states = core.eager._run_custom_op(
             "fused_rotary_embedding_gcu", query_states, key_states, cos_sin, position_ids, True
         )

paddlenlp/transformers/llama/modeling.py

@@ -419,11 +419,14 @@ def forward(self, x, seq_len=None):
         return (
             cos.cast(x.dtype) if cos.dtype != x.dtype else cos,
             sin.cast(x.dtype) if sin.dtype != x.dtype else sin,
-            self.cos_sin_table.cast(x.dtype)
-            if self.cos_sin_table is not None and self.cos_sin_table.dtype != x.dtype
-            else self.cos_sin_table,
         )
 
+    def get_fused_cos_sin(self, x, seq_len=None):
+        if self.cos_sin_table is not None and self.cos_sin_table.dtype != x.dtype:
+            return self.cos_sin_table.cast(x.dtype)
+        else:
+            return self.cos_sin_table
+
 
 class LlamaLinearScalingRotaryEmbedding(LlamaRotaryEmbedding):
     def __init__(self, dim, max_position_embeddings=2048, base=10000, scaling_factor=1.0):
@@ -482,19 +485,26 @@ def _scale_cos_sin(self, seq_len):
     def forward(self, x, seq_len=None):
         # x: [bs, num_attention_heads, seq_len, head_size]
         if seq_len > self.max_position_embeddings:
-            scale_cos, scale_sin, scale_cos_sin = self._scale_cos_sin(seq_len=seq_len)
+            scale_cos, scale_sin, _ = self._scale_cos_sin(seq_len=seq_len)
         else:
-            scale_cos, scale_sin, scale_cos_sin = self.cos_cached, self.sin_cached, self.cos_sin_table
+            scale_cos, scale_sin = self.cos_cached, self.sin_cached
         cos = scale_cos[:, :seq_len, :, ...]
         sin = scale_sin[:, :seq_len, :, ...]
         return (
             cos.cast(x.dtype) if cos.dtype != x.dtype else cos,
             sin.cast(x.dtype) if sin.dtype != x.dtype else sin,
-            scale_cos_sin.cast(x.dtype)
-            if scale_cos_sin is not None and scale_cos_sin.dtype != x.dtype
-            else scale_cos_sin,
         )
 
+    def get_fused_cos_sin(self, x, seq_len=None):
+        if seq_len > self.max_position_embeddings:
+            _, _, scale_cos_sin = self._scale_cos_sin(seq_len=seq_len)
+        else:
+            scale_cos_sin = self.cos_sin_table
+        if scale_cos_sin is not None and scale_cos_sin.dtype != x.dtype:
+            return scale_cos_sin.cast(x.dtype)
+        else:
+            return scale_cos_sin
+
 
 def rotate_half(x):
     """Rotates half the hidden dims of the input."""
@@ -943,7 +953,7 @@ def forward(
                         sin.cast(value_states.dtype) if sin.dtype != value_states.dtype else sin,
                     )
                 else:
-                    cos, sin, _ = self.rotary_emb(value_states, seq_len=kv_seq_len)
+                    cos, sin = self.rotary_emb(value_states, seq_len=kv_seq_len)
 
                 query_states, key_states = apply_rotary_pos_emb(query_states, key_states, cos, sin, position_ids)