code: def softmax(z):
      zz = _np.exp(z - z.max())
      return zz / zz.sum(-1, keepdims=True)
  
file_path: turicreate/src/python/turicreate/toolkits/object_detector/_detection.py
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import numpy
label_desc: Use image node_id 3 for calling a global function with example usage: softmax(z) and returns: unknown