fix problem about chunk_interval

zhaomingwork

2023-05-06 eb6c31aeddfa1840b9de2aebec652c5ea8795948

 egs/aishell/transformer/utils/prepare_checkpoint.py

@@ -1,8 +1,6 @@
import os
import shutil

from modelscope.pipelines import pipeline
from modelscope.utils.constant import Tasks
from modelscope.hub.snapshot_download import snapshot_download