code: def __call__(self, x: float, y: float = 0) -> float:
      return abs(x + y)
  
imports: import pickle
  import numpy
  import pytest
  import nevergrad
  from nevergrad.common import testing
  from nevergrad.functions import ArtificialFunction
  import nevergrad.common.typing
  from .None import base
  from .None import helpers
label_desc: Use image node_id 1 for calling the _Callable obj's underlying member method code with example usage: obj.__call__(x, y) and returns: abs