Merge pull request #857 from will-jl944/develop_jf

Fix bug that occurs when `fpn_num_channels` is changed in FasterRCNN

dygraph/paddlex/cv/datasets/voc.py

@@ -14,7 +14,6 @@
 
 from __future__ import absolute_import
 import copy
-import os
 import os.path as osp
 import random
 import re

dygraph/paddlex/cv/models/detector.py

@@ -848,7 +848,8 @@ class FasterRCNN(BaseDetector):
                 if test_pre_nms_top_n is None else test_pre_nms_top_n,
                 'post_nms_top_n': test_post_nms_top_n
             }
-            head = ppdet.modeling.TwoFCHead(out_channel=1024)
+            head = ppdet.modeling.TwoFCHead(
+                in_channel=neck.out_shape[0].channels, out_channel=1024)
             roi_extractor_cfg = {
                 'resolution': 7,
                 'spatial_scale': [1. / i.stride for i in neck.out_shape],