code: def guided(model):
      """Modifies backprop to only propagate positive gradients for positive activations.
  
      Args:
          model: The `keras.models.Model` instance whose gradient computation needs to be overridden.
  
      References:
          Details on guided back propagation can be found in paper: [String For Simplicity: The All Convolutional Net]
          (https://arxiv.org/pdf/1412.6806.pdf)
      """
      return backend.modify_model_backprop(model, "guided")
  
imports: from __future__ import absolute_import
  from .None import backend
  from .utils import utils
label_desc: Use image node_id 1 for calling a global function with example usage: guided(model) and returns: backend