Add replace_ImageToTensor for batch inference

[Johnson-Wang]

No description provided.

[codecov]

Codecov Report

Merging #3686 into master will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3686      +/-   ##
==========================================
- Coverage   60.84%   60.82%   -0.02%     
==========================================
  Files         216      217       +1     
  Lines       15351    15328      -23     
  Branches     2622     2610      -12     
==========================================
- Hits         9341     9324      -17     
+ Misses       5536     5535       -1     
+ Partials      474      469       -5     

Flag	Coverage Δ
#unittests	60.82% <100.00%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
mmdet/utils/__init__.py	100.00% <100.00%> (ø)
mmdet/utils/config_hacks.py	100.00% <100.00%> (ø)
mmdet/models/roi_heads/test_mixins.py	47.78% <0.00%> (-9.74%)	⬇️
mmdet/models/roi_heads/mask_heads/fcn_mask_head.py	73.37% <0.00%> (-1.30%)	⬇️
mmdet/datasets/coco.py	45.39% <0.00%> (-0.25%)	⬇️
mmdet/models/roi_heads/cascade_roi_head.py	72.01% <0.00%> (-0.12%)	⬇️
mmdet/models/roi_heads/__init__.py	100.00% <0.00%> (ø)
mmdet/datasets/lvis.py	14.38% <0.00%> (+0.20%)	⬆️
mmdet/apis/test.py	13.08% <0.00%> (+0.24%)	⬆️
... and 2 more

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