add contrastive learning

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
4 out of 5 committers have signed the CLA.

:white_check_mark: yzhjerry
:white_check_mark: chenglongliu123
:white_check_mark: wwxxzz
:white_check_mark: yangxudong
:x: chengmengli06
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

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Code Style Test Failed