class_docstr: This class is used to register function or :class:`functools.partial` class to a registry.
class_docstr_tok: ["This","class","is","used","to","register","function","or",":","class",":","`","functools.partial","`","class","to","a","registry","."]
code: def __len__(self) -> int:
      return len(self.functions)
  
imports: import functools
  import inspect
  import itertools
  from typing import Any, Callable, Dict, List, Optional, Union
  from pytorch_lightning.utilities import rank_zero_info
  from flash.core.utilities.providers import Provider
label_desc: Use image node_id 3 for calling the FlashRegistry obj's underlying member method code with example usage: obj.__len__() and returns: len