code: def __len__(self) -> int:
      return len(self._i2val)
  
file_path: scattertext/scattertext/indexstore/IndexStore.py
imports: from typing import Any, Iterable, List, Set, Tuple
label_desc: Use image node_id 4 for calling the IndexStore obj's underlying member method code with example usage: obj.__len__() and returns: len