Rescale to original scale after post-processor

[zhiqwang]

Actually the predicted result after the post-processor has not changed to the original scale.

[codecov]

Codecov Report

Merging #47 (1ac7a60) into master (cc65a6d) will decrease coverage by 6.21%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #47      +/-   ##
==========================================
- Coverage   78.35%   72.14%   -6.22%     
==========================================
  Files           8        8              
  Lines         619      621       +2     
==========================================
- Hits          485      448      -37     
- Misses        134      173      +39     

Flag	Coverage Δ
unittests	72.14% <100.00%> (-6.22%)	⬇️

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Impacted Files	Coverage Δ
test/test_engine.py	82.60% <100.00%> (-15.12%)	⬇️
test/test_torchscript.py	97.43% <100.00%> (ø)
test/dataset_utils.py	27.27% <0.00%> (-72.73%)	⬇️

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