# Some third-party helper functions

+ generate_anchors.py: copied from [py-faster-rcnn](https://github.com/rbgirshick/py-faster-rcnn/blob/master/lib/rpn/generate_anchors.py).
+ box_ops.py: modified from [TF object detection API](https://github.com/tensorflow/models/blob/master/research/object_detection/core/box_list_ops.py).
+ np_box_ops.py: copied from [TF object detection API](https://github.com/tensorflow/models/blob/master/research/object_detection/utils/np_box_ops.py).