message: Update layers_test.py
  Done with the necessary change , please verify and get back.
diff: @@ -1740,7 +1740,7 @@ class BatchNormTest(test.TestCase):
  return expected_var, correction_factor
  def testBatchNormCenterFalse(self):
  - a = array_ops.placeholder(dtype.float32, shape=(10, 10, 10, 10))
  + a = array_ops.placeholder(dtype=dtypes.float32, shape=(10, 10, 10, 10))
  # Test that center=False builds a valid graph.
  _layers.batch_norm(a, center=False, data_format='NCHW',
  zero_debias_moving_mean=True)
  