code: def prev_widen(self, indices, magnifier, noise=None):
      self.widen_bn(indices, magnifier, noise=noise)
  
imports: from .basic_model import BasicModel
  import tensorflow
  import numpy
  import copy
label_desc: Use image node_id 7 for calling the PoolLayer obj's underlying member method code with example usage: obj.prev_widen(indices, magnifier, noise) without return types