class_docstr: In-memory results.
docstr: Check that predictions exist.
docstr_tok: ["Check","that","predictions","exist","."]
code: def check_predictions_exist(
      self, strategy, dataset_name, cv_fold, train_or_test
  ):
      """Check that predictions exist."""
      # for in-memory results, always false, results are always overwritten
      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 4 for calling the RAMResults obj's underlying member method code with example usage: obj.check_predictions_exist(strategy, dataset_name, cv_fold, train_or_test) and returns: False