code: def __call__(self, y: np.ndarray) -> float:
      a = float(self._a)
      y = self._input_converter(y)
      n = y.shape[0]
      indices = [
          (j + k + 1) % n for k in np.arange(n) for j in np.arange(n)
      ]
  
      q = (
          y.sum()
          + np.fabs(y[indices].reshape((n, n)) - y)[
              :, 0 : int(a) - 1
          ].sum()
      )
      r = n * np.ceil(a / 2) * (1.0 + 2 * a - 2 * np.ceil(a / 2)) / a
  
      return q / r
  
imports: from __future__ import annotations
  import abc
  from typing import Callable
  from typing import Union
  import numpy
label_desc: Use image node_id 2 for calling the NonSeparableReductionTransformation obj's underlying member method code with example usage: obj.__call__(y) and returns: unknown