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[SkafteNicki]

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• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
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• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes # (issue).

PR review

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Did you have fun?

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[codecov]

Codecov Report

Merging #198 (adc6254) into master (d3058c4) will decrease coverage by 16.70%.
The diff coverage is n/a.

❗ Current head adc6254 differs from pull request most recent head 5339f12. Consider uploading reports for the commit 5339f12 to get more accurate results

@@             Coverage Diff             @@
##           master     #198       +/-   ##
===========================================
- Coverage   96.63%   79.93%   -16.71%     
===========================================
  Files         180       90       -90     
  Lines        5760     2870     -2890     
===========================================
- Hits         5566     2294     -3272     
- Misses        194      576      +382     

Flag	Coverage Δ
Linux	79.93% <ø> (ø)
Windows	79.93% <ø> (ø)
cpu	79.93% <ø> (-16.71%)	⬇️
gpu	?
macOS	79.93% <ø> (-16.71%)	⬇️
pytest	79.93% <ø> (-16.71%)	⬇️
python3.6	?
python3.8	?
python3.9	?
torch1.3.1	?
torch1.4.0	?
torch1.8.1	?

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

Impacted Files	Coverage Δ
torchmetrics/utilities/distributed.py	22.85% <0.00%> (-74.29%)	⬇️
torchmetrics/classification/auc.py	47.61% <0.00%> (-52.39%)	⬇️
torchmetrics/functional/classification/auroc.py	46.15% <0.00%> (-40.01%)	⬇️
torchmetrics/metric.py	56.17% <0.00%> (-39.05%)	⬇️
torchmetrics/functional/regression/psnr.py	60.60% <0.00%> (-36.37%)	⬇️
torchmetrics/functional/classification/accuracy.py	57.57% <0.00%> (-36.37%)	⬇️
...chmetrics/functional/classification/stat_scores.py	66.66% <0.00%> (-33.34%)	⬇️
...rics/functional/classification/confusion_matrix.py	66.66% <0.00%> (-33.34%)	⬇️
torchmetrics/utilities/checks.py	60.54% <0.00%> (-31.90%)	⬇️
torchmetrics/functional/classification/f_beta.py	73.91% <0.00%> (-26.09%)	⬇️
... and 132 more

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