class_docstr: HDD results.
docstr: Check that fitted strategy exists.
docstr_tok: ["Check","that","fitted","strategy","exists","."]
code: def check_fitted_strategy_exists(
      self, strategy_name, dataset_name, cv_fold
  ):
      """Check that fitted strategy exists."""
      path = (
          self._generate_key(
              strategy_name,
              dataset_name,
              cv_fold,
              train_or_test="train",
          )
          + ".pickle"
      )
      if os.path.isfile(path):
          return True
      else:
          return False
  
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 5 for calling the HDDResults obj's underlying member method code with example usage: obj.check_fitted_strategy_exists(strategy_name, dataset_name, cv_fold) and returns: True, False