Fix evaluation import problem (#46)

* Detection evaluation function

* Add license

* Fix python import problem

* Modify requirement.txt

* Add requirements.txt

Co-authored-by: Jason <jiangjiajun@baidu.com>

fastdeploy/vision/evaluation/utils/coco.py

@@ -15,7 +15,6 @@
 from __future__ import absolute_import
 import copy
 import os.path as osp
-import six
 import sys
 import numpy as np
 from . import fd_logging as logging