code: def id(x):
      return x
  
imports: from __future__ import division, print_function, absolute_import
  from numpy import asanyarray, asarray, array, matrix, zeros
  from scipy.sparse.sputils import asmatrix
  from scipy.sparse.linalg.interface import aslinearoperator, LinearOperator, IdentityOperator
label_desc: Use image node_id 2 for calling a global function with example usage: id(x) and returns: x