Fix RPN show_result error

[hhaAndroid]

Fix RPN show_result error

[codecov]

Codecov Report

Merging #4716 (a3f5a15) into master (9946e12) will decrease coverage by 0.04%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #4716      +/-   ##
==========================================
- Coverage   63.89%   63.84%   -0.05%     
==========================================
  Files         252      252              
  Lines       19658    19583      -75     
  Branches     3329     3341      +12     
==========================================
- Hits        12560    12503      -57     
+ Misses       6426     6400      -26     
- Partials      672      680       +8     

Flag	Coverage Δ
unittests	63.81% <50.00%> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmdet/models/dense_heads/embedding_rpn_head.py	97.29% <ø> (+17.70%)	⬆️
mmdet/models/detectors/cascade_rcnn.py	50.00% <ø> (ø)
mmdet/models/detectors/rpn.py	67.24% <50.00%> (+7.24%)	⬆️
mmdet/core/bbox/coder/base_bbox_coder.py	75.00% <0.00%> (-5.00%)	⬇️
mmdet/models/detectors/single_stage.py	80.35% <0.00%> (-4.55%)	⬇️
mmdet/models/roi_heads/base_roi_head.py	76.31% <0.00%> (-3.69%)	⬇️
mmdet/models/dense_heads/rpn_head.py	69.47% <0.00%> (-3.57%)	⬇️
mmdet/models/detectors/two_stage.py	71.26% <0.00%> (-3.16%)	⬇️
mmdet/models/detectors/base.py	52.80% <0.00%> (-2.51%)	⬇️
mmdet/core/bbox/coder/yolo_bbox_coder.py	58.97% <0.00%> (-2.01%)	⬇️
... and 41 more

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