class_docstr: Base results class.
class_docstr_tok: ["Base","results","class","."]
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."""
      raise NotImplementedError()
  
imports: import os
  from abc import ABC, abstractmethod
  from warnings import warn
  import numpy
  from joblib import dump, load
label_desc: Use image node_id 4 for calling the BaseResults obj's underlying member method code with example usage: obj.check_predictions_exist(strategy, dataset_name, cv_fold, train_or_test) without return types