code: def test_b_init_when_with_bias_false(self):
      with self.assertRaisesRegex(ValueError, "b_init must not be set"):
          mlp.MLP([1], with_bias=False, b_init=lambda *_: _)
  
imports: from absl.testing import absltest
  from absl.testing import parameterized
  from haiku._src import test_utils
  from haiku._src.nets import mlp
  import jax
  import jax.numpy
label_desc: Use image node_id 1 for calling the MLPTest obj's underlying member method code with example usage: obj.test_b_init_when_with_bias_false() without return types