def get_anno(self, index):
        """obtain the annotation for one media (video or image)

        Args:
            index (int): The media index.

        Returns: dict.
            - "image": the filename, video also use "image".
            - "caption": The caption for this file.

        """
        anno = self.anno_list[index]
        if self.data_root is not None:
            anno["image"] = os.path.join(self.data_root, anno["image"])
        return anno
obtain the annotation for one media (video or image)

        Args:
            index (int): The media index.

        Returns: dict.
            - "image": the filename, video also use "image".
            - "caption": The caption for this file.

        
video_chat2/dataset/base_dataset.py