Besides removing unnecessary imports, this also fixes the missing logger module in test_architectures.py within the static directory.

* update solov2 some detail

* fix check paddle version

* add enable_static()

* follow comments

* remove blank line

* clean useless log in DataLoader

* fix infer set_sample_list_generator

* Update docs
* Update README.md

* update check config

* fix slim/xx

* exit1 in travis failed