code: def perform(self, node, inputs, output_storage):
      x = inputs[0]
      z = output_storage[0]
      z[0] = x * 2
  
file_path: Theano/doc/hpcs2011_tutorial/double_op.py
imports: from __future__ import absolute_import, print_function, division
  import numpy
  import theano
label_desc: Use image node_id 5 for calling the DoubleOp obj's underlying member method code with example usage: obj.perform(node, inputs, output_storage) without return types