Compatibility with JENN 2.0

[bpaul4]

Fixes/Addresses:

#1276

Summary/Motivation:

JENN 2.0 changed the import path of the NeuralNet class. This updates the import in the training file and regenerates the pkl model files. SMT already updated their syntax on their end, but our model file was out of date and needed to be regenerated as well.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.05%. Comparing base (bb11943) to head (f0572b8).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1282   +/-   ##
=======================================
  Coverage   39.05%   39.05%           
=======================================
  Files         165      165           
  Lines       37745    37745           
  Branches     5864     5864           
=======================================
  Hits        14740    14740           
  Misses      21879    21879           
  Partials     1126     1126           

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