Which model checkpoint should be selected for evaluation？
According to this sample：
https://github.com/huggingface/transformers/blob/master/examples/pytorch/summarization/run_summarization.py

I get many checkpoints. 
![image](https://user-images.githubusercontent.com/20811685/148014017-c86d6aff-abb1-49b7-9390-26cf5b627244.png)

Which should be selected for testing
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