* New features
  1. perf(retrieval): update knn_rank implementation. 4bf26fb544
  2. perf(retrieval): to avoid invalid labels, using sort_idx_list to sort gallery_img_name_list. 484970e6efc
  3. feat(enhancer.py): judge whether to learn PCA parameters on the gallery dataset. f72addbde796
* Bug fixes
  1. fix(map_for_oxford.py): repair map calculation use self.batch_rank_name_list replace self.query_name_list to participate in the operation. d2b5a59afe8
  2. fix(resnet.py): pretrained: AssertionError: Missing keys when loading pretrained weights: []. 0f6b15eda0e