fix: Fixed rexnet1_3x and rexnet1_5x and updated checkpoints

[frgfm]

This PR introduces the following modifications:

• fixes building of rexnet1_3x and rexnet1_5x (they were actually building a rexnet1_0x because of a typo)
• adds new features to training scipt: non-square image size, resize mode, updated augmentations, improved sample plotting, added gradient accumulation option, added an option to analyze training set image sizes and added a feature of Holocron to plot samples in the training set that yielded the highest loss
• retrained all rexnets & updated checkpoints
• updated the csv with performance
• fixed the resizing in API & demo

Any feedback is welcome!

[codecov[bot]]

Codecov Report

Merging #164 (458ac8b) into master (6d88202) will decrease coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
- Coverage   93.88%   93.85%   -0.03%     
==========================================
  Files           9        9              
  Lines         229      228       -1     
==========================================
- Hits          215      214       -1     
  Misses         14       14              

Flag	Coverage Δ
unittests	93.85% <100.00%> (-0.03%)	:arrow_down:

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

Impacted Files	Coverage Δ
pyrovision/models/mobilenetv3.py	100.00% <ø> (ø)
pyrovision/models/resnet.py	100.00% <ø> (ø)
pyrovision/datasets/utils.py	88.57% <100.00%> (-0.17%)	:arrow_down:
pyrovision/models/rexnet.py	100.00% <100.00%> (ø)

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[MateoLostanlen]

Hi @frgfm just a question did you use readme parameters for all models ? If not, it would be nice to add them to the performance table to keep track

[frgfm]

@MateoLostanlen I kept everything, but the args are not always the same from one model to the other. So we'll have to think about how to keep track of that & share it

[frgfm]

I just updated the readme instruction to display the command I use most often :+1: