class_docstr: HDD results.
docstr: Save fitted strategy.
docstr_tok: ["Save","fitted","strategy","."]
code: def save_fitted_strategy(self, strategy, dataset_name, cv_fold):
      """Save fitted strategy."""
      path = (
          self._generate_key(
              strategy.name,
              dataset_name,
              cv_fold,
              train_or_test="train",
          )
          + ".pickle"
      )
      strategy.save(path)
      self._append_key(strategy.name, dataset_name)
  
imports: import os
  import numpy
  import pandas
  from joblib import load
  from sktime.benchmarking.base import BaseResults, HDDBaseResults, _PredictionsWrapper
label_desc: Use image node_id 3 for calling the HDDResults obj's underlying member method code with example usage: obj.save_fitted_strategy(strategy, dataset_name, cv_fold) without return types