revert softmax inside the pooledr

Signed-off-by: Kevin-Yang <[email protected]>

Author: jason9693

vllm/model_executor/layers/pooler.py

@@ -28,11 +28,15 @@ class Pooler(nn.Module):
         normalize: Whether to normalize the pooled data.
     """
 
-    def __init__(self, pooling_type: PoolingType, normalize: bool):
+    def __init__(self,
+                 pooling_type: PoolingType,
+                 normalize: bool,
+                 softmax: bool = False):
         super().__init__()
 
         self.pooling_type = pooling_type
         self.normalize = normalize
+        self.softmax = softmax
 
     def forward(
         self,
@@ -64,6 +68,9 @@ def forward(
         if self.normalize:
             pooled_data = nn.functional.normalize(pooled_data, p=2, dim=1)
 
+        if self.softmax:
+            pooled_data = nn.functional.softmax(pooled_data, dim=-1)
+
         pooled_outputs = [
             EmbeddingSequenceGroupOutput(data.tolist()) for data in pooled_data
         ]

vllm/model_executor/models/qwen2_cls.py

@@ -77,7 +77,9 @@ def __init__(
         self.score = RowParallelLinear(config.hidden_size,
                                        config.num_labels,
                                        quant_config=quant_config)
-        self._pooler = Pooler(pooling_type=PoolingType.LAST, normalize=False)
+        self._pooler = Pooler(pooling_type=PoolingType.LAST,
+                              normalize=False,
+                              softmax=True)
 
     def forward(
         self,
@@ -97,8 +99,7 @@ def pooler(
         hidden_states: torch.Tensor,
         pooling_metadata: PoolingMetadata,
     ) -> Optional[PoolerOutput]:
-        pooled = self._pooler(hidden_states, pooling_metadata)
-        return nn.functional.softmax(pooled, dim=-1)
+        return self._pooler(hidden_states, pooling_metadata)
 
     def load_weights(self, weights: Iterable[Tuple[str, torch.Tensor]]):
         loader = AutoWeightsLoader(self,