[Fix] CheckpointManager couldn't work properly and KV files couldn't be restored when user using a lazy build Keras model. #374
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Description
Fix the problems which checkpointManager couldn't work properly and KV files couldn't be restored when user using a lazy build Keras model.
Also fix some DE Keras Embedding demo which couldn't run. Fixes #370
Type of change
Checklist:
How Has This Been Tested?
also run the demo demo/dynamic_embedding/movielens-1m-keras and demo/dynamic_embedding/movielens-1m-keras-with-horovod