code: def __call__(
      self, guesses: Floats2d, truths: Floats2d
  ) -> Tuple[Floats2d, float]:
      return self.get_grad(guesses, truths), self.get_loss(
          guesses, truths
      )
  
imports: from abc import abstractmethod
  from typing import Any, Dict, Generic, List, Optional, Sequence, Tuple, TypeVar, Union, cast
  from .config import registry
  from .types import Floats2d, Ints1d
  from .util import get_array_module, to_categorical
label_desc: Use image node_id 2 for calling the L2Distance obj's underlying member method code with example usage: obj.__call__(guesses, truths) and returns: self,  self