def read_metadata(metadata_df, index):
    """Returns a dictionary of useful metadata."""
    file_path = metadata_df['file_path'].values[index]
    base_name_pkl = file_path.split('/')[-1]

    metadata_dict = {
        'base_name_pkl': base_name_pkl,
        'classifier': metadata_df['full_classifier'].values[index],
        'obj_type': metadata_df['object_type'].values[index],
        'obj_name': metadata_df['object_name'].values[index]
    }

    return metadata_dict