switch to torchmetrics

[Borda]

What does this PR do?

switch to torchmetrics

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[kaushikb11]

@Borda

ERROR: Could not find a version that satisfies the requirement torchmetrics==0.2 (from lightning-flash)
ERROR: No matching distribution found for torchmetrics==0.2

[Borda]

yes, the package is not in final release yet, just RC, so will rerun tests when it is up... :]

[tchaton]

Really excited to see this !

[codecov]

Codecov Report

Merging #169 (82b3835) into master (dbb768c) will decrease coverage by 7.51%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #169      +/-   ##
==========================================
- Coverage   87.39%   79.88%   -7.52%     
==========================================
  Files          49       49              
  Lines        1579     1581       +2     
==========================================
- Hits         1380     1263     -117     
- Misses        199      318     +119     

Flag	Coverage Δ
unittests	79.88% <100.00%> (-7.52%)	⬇️

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

Impacted Files	Coverage Δ
flash/tabular/classification/model.py	79.31% <100.00%> (+0.73%)	⬆️
flash/text/classification/model.py	66.66% <100.00%> (-30.31%)	⬇️
flash/text/seq2seq/summarization/metric.py	84.48% <100.00%> (-12.07%)	⬇️
flash/text/seq2seq/translation/metric.py	95.83% <100.00%> (ø)
flash/vision/classification/model.py	100.00% <100.00%> (ø)
flash/vision/embedding/image_embedder_model.py	79.66% <100.00%> (ø)
flash/text/seq2seq/core/data.py	30.13% <0.00%> (-54.80%)	⬇️
flash/text/classification/data.py	31.86% <0.00%> (-53.85%)	⬇️
flash/text/seq2seq/translation/model.py	55.55% <0.00%> (-16.67%)	⬇️
... and 8 more

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