code: def size_of_shape(shape):
      return functools.reduce(operator.mul, shape, 1)
  
file_path: chainerrl/chainerrl/initializers/orthogonal.py
imports: import functools
  import operator
  import numpy
  from chainer import cuda
  from chainer import initializer
label_desc: Use image node_id 1 for calling a global function with example usage: size_of_shape(shape) and returns: functools