code: def init_weights_and_state(self, input_signature):
      self.weights = np.zeros(input_signature.shape[-1])
  
imports: import os
  import pathlib
  import urllib
  import zipfile
  import gin
  import jax
  import tensorflow
  from trax import fastmath
  from trax import layers
  from trax.fastmath import numpy
label_desc: Use image node_id 2 for calling the AddBias obj's underlying member method code with example usage: obj.init_weights_and_state(input_signature) without return types