210130121

* add argmax test

* fix ci error

* fix docstring warning

* fix tensor greater and less bug

* fix conflict

* add test_flow_xxx_against_pytorch func

* add asinh and arcsinh test

* add asinh and arcsinh test

* add sinh test

* add atan2 module test

* add softplus test, softplus module has bug

* comment softplus

* add elu module autotest

* refine

* auto format by CI

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Co-authored-by: oneflow-ci-bot <ci-bot@oneflow.org>