code: def delete(self):
      for fname in self.cache_map.values():
          if path_exists(fname):
              # Parquet entries in the cache_ma can be pointers to directories.
              delete(fname, recursive=True)
  
imports: import logging
  import os
  from typing import Optional
  from ludwig.constants import CHECKSUM, META, TEST, TRAINING, VALIDATION
  from ludwig.data.cache.types import alphanum, CacheableDataset
  from ludwig.data.cache.util import calculate_checksum
  from ludwig.data.dataset.base import DatasetManager
  from ludwig.utils import data_utils
  from ludwig.utils.fs_utils import delete, path_exists
label_desc: Use image node_id 4 for calling the DatasetCache obj's underlying member method code with example usage: obj.delete() without return types