Revert "690 nan inf loss"

[mathpluscode]

Reverts #719

This PR is buggy.

[codecov]

Codecov Report

Merging #732 (adb3b95) into main (e47c569) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #732   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           39        38    -1     
  Lines         2443      2445    +2     
=========================================
+ Hits          2443      2445    +2     

Impacted Files	Coverage Δ
deepreg/model/network.py	100.00% <ø> (ø)
deepreg/dataset/loader/interface.py	100.00% <100.00%> (ø)
deepreg/loss/image.py	100.00% <100.00%> (ø)
deepreg/loss/label.py	100.00% <100.00%> (ø)
deepreg/loss/util.py	100.00% <100.00%> (ø)

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