Inference v2.1 for etna v1

[Mr-Geekman]

Before submitting (must do checklist)

• Did you read the contribution guide?
• Did you update the docs? We use Numpy format for all the methods and classes.
• Did you write any new necessary tests?
• Did you update the CHANGELOG?

Proposed Changes

Add

• Add refit parameter into backtest (#1159)
• Add stride parameter into backtest (#1165)
• Add optional parameter ts into forecast method of pipelines (#1071)
• Add tests on transform method of transforms on subset of segments, on new segments, on future with gap (#1094)
• Add tests on inverse_transform method of transforms on subset of segments, on new segments, on future with gap (#1127)

Change

• Add more scenarios into tests for models (#1082)
• Decouple SeasonalMovingAverageModel from PerSegmentModelMixin (#1132)
• Decouple DeadlineMovingAverageModel from PerSegmentModelMixin (#1140)

Fix

• Fix inference tests on new segments for DeepARModel and TFTModel (#1109)
• Fix alignment during forecasting in new NNs, add validation of context size during forecasting in new NNs, add validation of batch in MLPNet (#1108)
• Fix MeanSegmentEncoderTransform to work with subset of segments and raise error on new segments (#1104)
• Fix outliers transforms on future with gap (#1147)
• Fix SegmentEncoderTransform to work with subset of segments and raise error on new segments (#1103)
• Fix SklearnTransform in per-segment mode to work on subset of segments and raise error on new segments (#1107)
• Fix OutliersTransform and its children to raise error on new segments (#1139)
• Fix DifferencingTransform to raise error on new segments during transform and inverse_transform in inplace mode (#1141)
• Teach DifferencingTransform to inverse_transform with NaNs (#1155)

Closing issues

[review-notebook-app]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

---

Powered by ReviewNB

[github-actions]

🚀 Deployed on https://deploy-preview-1178--etna-docs.netlify.app

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (etna_v1@840f353). Click here to learn what that means.
The diff coverage is n/a.

📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

@@            Coverage Diff             @@
##             etna_v1    #1178   +/-   ##
==========================================
  Coverage           ?   87.21%           
==========================================
  Files              ?      159           
  Lines              ?     9211           
  Branches           ?        0           
==========================================
  Hits               ?     8033           
  Misses             ?     1178           
  Partials           ?        0           

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more