code: def __init__(self, indices: np.ndarray, indim: int) -> None:
      self.indices = indices
      self.outdim = indices.size
      self.indim = indim
  
imports: from typing import List, Callable, Optional
  from math import exp, sqrt
  import numpy
label_desc: Use image node_id 1 to create a new Indexing object  with example: obj = Indexing(indices, indim)