code: def _ref_softmax(values):
      m = np.max(values)
      e = np.exp(values - m)
      return e / np.sum(e)
  
imports: import numpy
  from keras import activations
  from keras import backend
  from keras import testing
label_desc: Use image node_id 1 for calling a global function with example usage: _ref_softmax(values) and returns: unknown