docstr: Test setting the policy multiple times in a row.
docstr_tok: ["Test","setting","the","policy","multiple","times","in","a","row","."]
code: def test_set_policy_multiple_times(self):
      """Test setting the policy multiple times in a row."""
      set_dtype_policy("mixed_float16")
      policy = dtype_policy()
      self.assertEqual(policy.name, "mixed_float16")
  
      set_dtype_policy("float32")
      policy = dtype_policy()
      self.assertEqual(policy.name, "float32")
  
imports: from keras.mixed_precision import DTypePolicy
  from keras.mixed_precision import dtype_policy
  from keras.mixed_precision import set_dtype_policy
  from keras.testing import test_case
label_desc: Use image node_id 2 for calling the DTypePolicyGlobalFunctionsEdgeCasesTest obj's underlying member method code with example usage: obj.test_set_policy_multiple_times() without return types