code: def testInitB(self):
      my_initializer = lambda shape, dtype: None
      mod = linear.Linear(1, b_init=my_initializer)
      self.assertIs(mod.b_init, my_initializer)
  
imports: from absl.testing import parameterized
  import numpy
  from sonnet.src import linear
  from sonnet.src import test_utils
  import tensorflow
label_desc: Use image node_id 2 for calling the LinearTest obj's underlying member method code with example usage: obj.testInitB() without return types