encode_for_summarization function did actually add CLS and SEP to separate sentences
https://github.com/huggingface/transformers/blob/d32585a304107cb9f42ccb0e1278405aa3eb6c9c/examples/summarization/bertabs/utils_summarization.py#L130

Hi, 

Could you please take a look at this part of the codes? I think this part might not act the function to separate the sentences. The function doesn't actually add CLS and SEP to sentences. Thank you in advance for your help! 
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