docstr: Reset the global dtype policy before each test.
docstr_tok: ["Reset","the","global","dtype","policy","before","each","test","."]
code: def setUp(self):
      """Reset the global dtype policy before each test."""
      set_dtype_policy("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 1 for calling the DTypePolicyGlobalFunctionsTest obj's underlying member method code with example usage: obj.setUp() without return types