* [Docs] Improve the ResNet model page. * Fix lint. * Update stat.py
fvcore
* [Feature] Use fvcore for flops count * update requirements * update
* Refactor tools folder structure. * Modify tools/test.py and add eval_metric.py to analysis test output. * Add new tools `analyze_logs.py` and `print_config.py`. * Add comment for analysis_tools functions.