code: def oracle_call(self, x: np.ndarray) -> float:
      return float(x[0])
  
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 2 for calling the ExampleFunction obj's underlying member method code with example usage: obj.oracle_call(x) and returns: float