code: def test_set_policy_factory(self):
      def factory():
          class MyModule(module.Module):
              def __call__(self, x):
                  return x
  
          return MyModule
  
      cls1 = factory()
      cls2 = factory()
  
      mixed_precision.set_policy(cls1, jmp.get_policy("o=f16"))
      mixed_precision.set_policy(cls2, jmp.get_policy("o=bf16"))
      x = jnp.ones([])
      self.assertEqual(cls1()(x).dtype, jnp.float16)
      self.assertEqual(cls2()(x).dtype, jnp.bfloat16)
  
imports: import importlib
  from typing import Optional
  from absl.testing import absltest
  from haiku._src import base
  from haiku._src import conv
  from haiku._src import mixed_precision
  from haiku._src import module
  from haiku._src import test_utils
  from haiku._src import transform
  import jax
  import jax.numpy
  import jmp
label_desc: Use image node_id 8 for calling the MixedPrecisionTest obj's underlying member method code with example usage: obj.test_set_policy_factory() and returns: MyModule, x