code: def override_from_dict(self, values_dict):
      
      for name, value in values_dict.items():
        self.set_hparam(name, value)
      return self
docs: Override existing hyperparameter values, parsing new values from a dictionary.
  
      Args:
        values_dict: Dictionary of name:value pairs.
  
      Returns:
        The `HParams` instance.
  
      Raises:
        KeyError: If a hyperparameter in `values_dict` doesn't exist.
        ValueError: If `values_dict` cannot be parsed.