support control eos, fix #6345

Former-commit-id: eda76de32bab103c650f246327d214539ae6f291

src/llamafactory/chat/hf_engine.py

@@ -205,7 +205,9 @@ class HuggingfaceEngine(BaseEngine):
         )
         generate_output = model.generate(**gen_kwargs)
         response_ids = generate_output[:, prompt_length:]
-        response = tokenizer.batch_decode(response_ids, skip_special_tokens=True, clean_up_tokenization_spaces=True)
+        response = tokenizer.batch_decode(
+            response_ids, skip_special_tokens=generating_args["skip_special_tokens"], clean_up_tokenization_spaces=True
+        )
         results = []
         for i in range(len(response)):
             eos_index = (response_ids[i] == tokenizer.eos_token_id).nonzero()
@@ -249,7 +251,9 @@ class HuggingfaceEngine(BaseEngine):
             videos,
             input_kwargs,
         )
-        streamer = TextIteratorStreamer(tokenizer, skip_prompt=True, skip_special_tokens=True)
+        streamer = TextIteratorStreamer(
+            tokenizer, skip_prompt=True, skip_special_tokens=generating_args["skip_special_tokens"]
+        )
         gen_kwargs["streamer"] = streamer
         thread = Thread(target=model.generate, kwargs=gen_kwargs, daemon=True)
         thread.start()

src/llamafactory/chat/vllm_engine.py

@@ -170,7 +170,7 @@ class VllmEngine(BaseEngine):
             stop=stop,
             stop_token_ids=[self.tokenizer.eos_token_id] + self.tokenizer.additional_special_tokens_ids,
             max_tokens=max_tokens,
-            skip_special_tokens=True,
+            skip_special_tokens=self.generating_args["skip_special_tokens"],
         )
 
         if images is not None:  # add image features

src/llamafactory/hparams/generating_args.py

@@ -64,6 +64,10 @@ class GeneratingArguments:
         default=None,
         metadata={"help": "Default system message to use in chat completion."},
     )
+    skip_special_tokens: bool = field(
+        default=True,
+        metadata={"help": "Whether or not to remove special tokens in the decoding."},
+    )
 
     def to_dict(self) -> Dict[str, Any]:
         args = asdict(self)

src/llamafactory/train/sft/trainer.py

@@ -141,7 +141,9 @@ class CustomSeq2SeqTrainer(Seq2SeqTrainer):
         padded_tensor[:, -src_tensor.shape[-1] :] = src_tensor  # adopt left-padding
         return padded_tensor.contiguous()  # in contiguous memory
 
-    def save_predictions(self, dataset: "Dataset", predict_results: "PredictionOutput") -> None:
+    def save_predictions(
+        self, dataset: "Dataset", predict_results: "PredictionOutput", gen_kwargs: Dict[str, Any]
+    ) -> None:
         r"""
         Saves model predictions to `output_dir`.
 
@@ -168,8 +170,12 @@ class CustomSeq2SeqTrainer(Seq2SeqTrainer):
                 preds[i] = np.concatenate((preds[i][pad_len[0] :], preds[i][: pad_len[0]]), axis=-1)
 
         decoded_inputs = self.processing_class.batch_decode(dataset["input_ids"], skip_special_tokens=False)
-        decoded_preds = self.processing_class.batch_decode(preds, skip_special_tokens=True)
+        decoded_preds = self.processing_class.batch_decode(
-        decoded_labels = self.processing_class.batch_decode(labels, skip_special_tokens=True)
+            preds, skip_special_tokens=gen_kwargs["skip_special_tokens"]
+        )
+        decoded_labels = self.processing_class.batch_decode(
+            labels, skip_special_tokens=gen_kwargs["skip_special_tokens"]
+        )
 
         with open(output_prediction_file, "w", encoding="utf-8") as f:
             for text, pred, label in zip(decoded_inputs, decoded_preds, decoded_labels):

src/llamafactory/train/sft/workflow.py

@@ -130,7 +130,7 @@ def run_sft(
             predict_results.metrics.pop("predict_loss", None)
         trainer.log_metrics("predict", predict_results.metrics)
         trainer.save_metrics("predict", predict_results.metrics)
-        trainer.save_predictions(dataset_module["eval_dataset"], predict_results)
+        trainer.save_predictions(dataset_module["eval_dataset"], predict_results, gen_kwargs)
 
     # Create model card
     create_modelcard_and_push(trainer, model_args, data_args, training_args, finetuning_args)