对于部分dataloader需要缓存，如果设置不变可以从cache中读取，避免反复做process操作 Just save the cache in cwd, record the data hash and check whether the source is changed
对于部分dataloader需要缓存，如果设置不变可以从cache中读取，避免反复做process操作
Just save the cache in cwd, record the data hash and check whether the source is changed