code: def transformed_dot_product(a, b):
      ks = set(a.keys()).intersection(set(b.keys()))
      dotprod = sum([a[k] * b[k] for k in ks])
      return np.log(1 + np.exp(-1 * dotprod))
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import copy
  import unittest
  import numpy
  import turicreate
  from turicreate.toolkits._main import ToolkitError
  from collections import Counter
  import sys
label_desc: Use image node_id 4 for calling a global function with example usage: transformed_dot_product(a, b) and returns: np