[model] support audio (#6701)

* support qwen2_audio

* improve code

* lint

* fix

* fix

* fix

---------

Co-authored-by: hiyouga <hiyouga@buaa.edu.cn>
Former-commit-id: 5eacb5629e4d7733cd992a63747a1335f2c6a929

src/llamafactory/hparams/data_args.py

@@ -41,9 +41,9 @@ class DataArguments:
         default="data",
         metadata={"help": "Path to the folder containing the datasets."},
     )
-    image_dir: Optional[str] = field(
+    media_dir: Optional[str] = field(
         default=None,
-        metadata={"help": "Path to the folder containing the images or videos. Defaults to `dataset_dir`."},
+        metadata={"help": "Path to the folder containing the images, videos or audios. Defaults to `dataset_dir`."},
     )
     cutoff_len: int = field(
         default=2048,
@@ -133,8 +133,8 @@ class DataArguments:
         self.dataset = split_arg(self.dataset)
         self.eval_dataset = split_arg(self.eval_dataset)
 
-        if self.image_dir is None:
-            self.image_dir = self.dataset_dir
+        if self.media_dir is None:
+            self.media_dir = self.dataset_dir
 
         if self.dataset is None and self.val_size > 1e-6:
             raise ValueError("Cannot specify `val_size` if `dataset` is None.")