class_docstr: This estimates bluriness.
code: def __call__(self, img: np.ndarray) -> float:
      assert img.shape[2] == 3
      assert len(img.shape) == 3
      img = np.asarray(img, dtype=np.float64)
      return -float(cv2.Laplacian(img, cv2.CV_64F).var())
  
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 1 for calling the Blur obj's underlying member method code with example usage: obj.__call__(img) and returns: unknown