code: def prev_widen(self, indices, magnifier, noise=None):
      assert self._init is not None, "Uninitialized layer"
      # rescale kernel
      self._init["kernel"] = self._init["kernel"][
          :, :, indices, :
      ] * magnifier.reshape([1, 1, -1, 1])
      if self.pre_activation:
          self.widen_bn(indices, magnifier, noise=noise)
  
imports: from models.basic_model import BasicModel
  import tensorflow
  import numpy
  import copy
label_desc: Use image node_id 8 for calling the ConvLayer obj's underlying member method code with example usage: obj.prev_widen(indices, magnifier, noise) without return types