code: def laplacian(A):
      r"""
      Computes the Laplacian of the given adjacency matrix as \(\D - \A\).
      :param A: rank 2 array or sparse matrix;
      :return: the Laplacian.
      """
      return degree_matrix(A) - A
  
imports: import copy
  import warnings
  from functools import partial
  import numpy
  import tensorflow
  from scipy import linalg
  from scipy import sparse
  from scipy.sparse.linalg import ArpackNoConvergence
label_desc: Use image node_id 4 for calling a global function with example usage: laplacian(A) and returns: unknown