Hi @wyli @rijobro ,

To follow the same API patten, I used meta_key_postfix arg in this transform, but actually, the pred data usually doesn't have the corresponding pred_meta_dict. So to use this transform, we must use CopyItemD to copy the meta data from image_meta_dict to pred_meta_dict first (Just what the unit test did).
Maybe it's better to use meta_key as arg in this transform? So users can set meta_key="image_meta_dict".
Actually, the benefit of meta_key_postfix is to execute on several keys together, all the keys have the same meta_key_postfix. This SaveClassificationd transform can only work for 1 key because it will save data into a single file, multiple keys will generate a mass in the file, so no need this benefit.

We have the same problem with SaveImageD transform, but it can save several keys together, I am not sure whether we need to change it.

What do you think?

Thanks.

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I added both meta_key and meta_key_postfix args after offline discussion.
@wyli @rijobro , could you please help review it?

Thanks.

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