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Created by Elizaveta Lutsenko@LizLutsenkoOwner
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Refactor metric evaluation for tuner

Created by: YamLyubov

Tuner now uses PipelineObjectiveEvaluate to evaluate metric while hyperparameters optimization.

  • Tuner uses the same metric function as composer
  • Pipeline.fine_tune_all_nodes is removed. To tune pipeline one can use PipelineTuner.tune. Initialized once, tuner can be used for tuning different pipelines, not only one.
  • Functions calculate_loss_function, cv_tabular_predictions, cv_time_series_predictions are replaced by PipelineObjectiveEvaluate and removed.
  • HyperoptTuner does not use information about whether metric is minimized or maximized. It always minimizes the metric.

#788