code: def list_evaluation_functions(kind=None):
      
  
      if kind is None:
          kind = tuple(_REGSITRY_KIND_CLASS_MAP.keys())
  
      if not isinstance(kind, tuple):
          if kind not in _REGSITRY_KIND_CLASS_MAP.keys():
              raise KeyError(
                  'Cannot find `kind` {}. Use '
                  '`list_evaluation_functions(kind=None).keys()` to get all the'
                  'valid kinds of evaluation functions.'.format(kind))
  
          reg = registry.get_registry(_REGSITRY_KIND_CLASS_MAP[kind])
          return list(reg.keys())
      else:
          return {name: list_evaluation_functions(kind=name) for name in kind}
docs: Get valid word embedding functions names.
  
      Parameters
      ----------
      kind : ['similarity', 'analogy', None]
          Return only valid names for similarity, analogy or both kinds of functions.
  
      Returns
      -------
      dict or list:
          A list of all the valid evaluation function names for the specified
          kind. If kind is set to None, returns a dict mapping each valid name to
          its respective output list. The valid names can be plugged in
          `gluonnlp.model.word_evaluation_model.create(name)`.