code: def check_dataset(self, dataset_id, project_id=None):
                 
          dataset = self.get_dataset(dataset_id, project_id)
          return bool(dataset)
docs: Check to see if a dataset exists.
  
          Parameters
          ----------
          dataset_id : str
              Dataset unique id
          project_id: str, optional
              The project the dataset is in
  
          Returns
          -------
          bool
              True if dataset at `dataset_id` exists, else Fasle