code: def occlude(f, occlusion):
      return f * (1 - occlusion)
  
file_path: autograd/examples/fluidsim/wing.py
imports: from __future__ import absolute_import
  from __future__ import print_function
  from builtins import range
  import autograd.numpy
  from autograd import value_and_grad
  from scipy.optimize import minimize
  import matplotlib.pyplot
  import os
label_desc: Use image node_id 1 for calling a global function with example usage: occlude(f, occlusion) and returns: unknown