unit test for probabilistic da-rnn

[kritim13]

Added json config for probabilistic da-rnn and made required changes to circleci config.yml

[codecov]

Codecov Report

Merging #152 into master will increase coverage by 2.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #152      +/-   ##
==========================================
+ Coverage   53.84%   55.98%   +2.13%     
==========================================
  Files          34       34              
  Lines        2431     2431              
==========================================
+ Hits         1309     1361      +52     
+ Misses       1122     1070      -52     

Flag	Coverage Δ
#python	55.98% <ø> (+2.13%)	⬆️

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Impacted Files	Coverage Δ
flood_forecast/training_utils.py	16.66% <0.00%> (-66.67%)	⬇️
flood_forecast/transformer_xl/transformer_basic.py	73.14% <0.00%> (-20.38%)	⬇️
flood_forecast/plot_functions.py	76.54% <0.00%> (-12.35%)	⬇️
flood_forecast/explain_model_output.py	84.61% <0.00%> (-4.40%)	⬇️
flood_forecast/trainer.py	86.53% <0.00%> (ø)
flood_forecast/custom/custom_opt.py	25.53% <0.00%> (ø)
flood_forecast/preprocessing/pytorch_loaders.py	85.32% <0.00%> (+0.91%)	⬆️
flood_forecast/utils.py	30.55% <0.00%> (+2.77%)	⬆️
flood_forecast/pytorch_training.py	80.12% <0.00%> (+4.81%)	⬆️
flood_forecast/basic/linear_regression.py	89.58% <0.00%> (+10.41%)	⬆️
... and 2 more

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