* add randperm with test and docs

* format code

* format

* fix docs

* format the code and add more tests

* format code

* Update test_randperm.py

* Update randperm.py

* add head

* format codes

* docs

* Update test_randperm.py

* Update test_randperm.py

* add more tests

* format

* Update randperm.py

* Update randperm_kernel.cu

* Update randperm_kernel.cu

* Update randperm_kernel.cpp

* reconstruct the code

* format the code

* 2

* s

* 1

* 1

* refine

* add more test

* refine code

* fix according to comment

* add more test
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