class_docstr: This loss uses the neural network Koncept512 to score images
  It takes one image or a list of images of shape [x, y, 3], with each pixel between 0 and 256, and returns a score.
code: def __call__(self, img: np.ndarray) -> float:
      loss = -self.koncept.assess(img)
      return float(loss)
  
imports: import os
  import typing
  import torch
  import numpy
  import cv2
  from nevergrad.functions.base import UnsupportedExperiment
  from nevergrad.common.decorators import Registry
label_desc: Use image node_id 2 for calling the Koncept512 obj's underlying member method code with example usage: obj.__call__(img) and returns: float