code: def _stride_arr(stride):
      """Map a stride scalar to the stride array for tf.nn.conv2d."""
      return [1, stride, stride, 1]
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import numpy
  import tensorflow
  from cleverhans.serial import NoRefModel
label_desc: Use image node_id 1 for calling a global function with example usage: _stride_arr(stride) and returns: list