update install script with lates mmdet dist to fix yolox input size i…

[fabiogeraci]

I modified the install script in order to fix the input_size issue with yolox, as pointed out by @dnth

[codecov]

Codecov Report

Merging #1123 (aa9a4f3) into master (356d29b) will decrease coverage by 0.19%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1123      +/-   ##
==========================================
- Coverage   85.48%   85.28%   -0.20%     
==========================================
  Files         305      305              
  Lines        6675     6675              
==========================================
- Hits         5706     5693      -13     
- Misses        969      982      +13     

Flag	Coverage Δ
unittests	85.28% <ø> (-0.20%)	⬇️

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Impacted Files	Coverage Δ
icevision/models/inference_sahi.py	81.44% <0.00%> (-13.41%)	⬇️

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[dnth]

Hi @fabiogeraci we've been wanting to upgrade the mmdet to 2.20.0 for a very long time now.. This change however breaks another model from mmdet (VFNet). Since there are many IceVision users who relied on VFNet we were reluctant to make this change.

We are now planning for an upgrade that will include this and will be out very soon! Thank you again for submitting this PR.

[fabiogeraci]

Thanks for the reply