code: def reshape_z(z, dim_z, ndim):
      """ensure z is a (dim_z, 1) shaped vector"""
  
      z = np.atleast_2d(z)
      if z.shape[1] == dim_z:
          z = z.T
  
      if z.shape != (dim_z, 1):
          raise ValueError(
              "z (shape {}) must be convertible to shape ({}, 1)".format(
                  z.shape, dim_z
              )
          )
  
      if ndim == 1:
          z = z[:, 0]
  
      if ndim == 0:
          z = z[0, 0]
  
      return z
  
imports: from __future__ import print_function
  from collections import defaultdict, deque
  import copy
  import inspect
  import numpy
label_desc: Use image node_id 4 for calling a global function with example usage: reshape_z(z, dim_z, ndim) and returns: z