Should make sure model is running in right mode

[TsumiNa]

bugfix: should make sure model is running in right mode regenerate indices of docs bump version to 0.4.0.beta4

[codecov[bot]]

Codecov Report

Merging #149 into master will increase coverage by 0.62%. The diff coverage is 49.41%.

@@            Coverage Diff             @@
##           master     #149      +/-   ##
==========================================
+ Coverage   84.11%   84.74%   +0.62%     
==========================================
  Files          87       86       -1     
  Lines        5735     5657      -78     
==========================================
- Hits         4824     4794      -30     
+ Misses        911      863      -48

Impacted Files	Coverage Δ
xenonpy/model/utils/__init__.py	100% <ø> (ø)	:arrow_up:
xenonpy/model/training/__init__.py	100% <100%> (ø)	:arrow_up:
tests/models/test_extension.py	97.93% <100%> (+0.04%)	:arrow_up:
tests/models/test_checker.py	98.63% <100%> (ø)	:arrow_up:
xenonpy/model/training/checker.py	79.37% <100%> (ø)
xenonpy/model/training/extension/persist.py	35.52% <20%> (-2.16%)	:arrow_down:
xenonpy/model/training/trainer.py	93.43% <38.88%> (-3.91%)	:arrow_down:
xenonpy/model/training/extension/validator.py	60.29% <50%> (+4.36%)	:arrow_up:
xenonpy/model/nn/__init__.py	0% <0%> (-100%)	:arrow_down:
xenonpy/model/nn/wrap.py	0% <0%> (-60.79%)	:arrow_down:
... and 1 more

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