fix #5411

Former-commit-id: 392bdaf1ea9e5baf6289f2d4415a175dd55a479d

src/llamafactory/chat/hf_engine.py

@@ -246,29 +246,18 @@ class HuggingfaceEngine(BaseEngine):
         batch_input: List[str],
         input_kwargs: Optional[Dict[str, Any]] = {},
     ) -> List[float]:
-        max_length = input_kwargs.pop("max_length", None)
+        max_length: Optional[int] = input_kwargs.pop("max_length", None)
         device = getattr(model.pretrained_model, "device", "cuda")
-        inputs = tokenizer(
+        inputs: Dict[str, "torch.Tensor"] = tokenizer(
             batch_input,
             padding=True,
             truncation=True,
             max_length=max_length or getattr(model.config, "max_position_embeddings", 1024),
             return_tensors="pt",
-            add_special_tokens=True,
+            add_special_tokens=False,
         ).to(device)
-
-        input_ids: torch.Tensor = inputs["input_ids"]
-        _, _, values = model(**inputs, output_hidden_states=True, return_dict=True)
-
-        if getattr(model.config, "model_type", None) == "chatglm":
-            values = torch.transpose(values, 0, 1)
-
-        scores = []
-        for i in range(input_ids.size(0)):
-            end_indexes = (input_ids[i] != tokenizer.pad_token_id).nonzero()
-            end_index = end_indexes[-1].item() if len(end_indexes) else 0
-            scores.append(values[i, end_index].nan_to_num().item())
-
+        values: "torch.Tensor" = model(**inputs, return_dict=True, use_cache=False)[-1]
+        scores = values.gather(dim=-1, index=(inputs["attention_mask"].sum(dim=-1, keepdim=True) - 1))
         return scores
 
     @override