def paths_from_lmdb(folder):
    """Generate paths from lmdb.

    Args:
        folder (str): Folder path.

    Returns:
        list[str]: Returned path list.
    """
    if not folder.endswith('.lmdb'):
        raise ValueError(f'Folder {folder}folder should in lmdb format.')
    with open(osp.join(folder, 'meta_info.txt')) as fin:
        paths = [line.split('.')[0] for line in fin]
    return paths
Generate paths from lmdb.

Args:
folder (str): Folder path.

Returns:
list[str]: Returned path list.
opensora/models/super_resolution/basicsr/data/data_util.py