How to use the saliency.GuidedBackprop function in saliency

saliency_method: string indicating saliency map type to generate.

  Returns:
    a saliency map and a smoothed saliency map.

  Raises:
    ValueError: if the saliency_method string does not match any included method
  """
  if saliency_method == 'integrated_gradients':
    integrated_placeholder = saliency.IntegratedGradients(graph, sess, y, image)
    return integrated_placeholder
  elif saliency_method == 'gradient':
    gradient_placeholder = saliency.GradientSaliency(graph, sess, y, image)
    return gradient_placeholder
  elif saliency_method == 'guided_backprop':
    gb_placeholder = saliency.GuidedBackprop(graph, sess, y, image)
    return gb_placeholder
  else:
    raise ValueError('No saliency method method matched. Verification of'
                     'input needed')