message: Use a trailing period to define floating point constant.
  In the code for tf.estimator, the array y_eval uses the constant "-7", when the rest of surrounding constants use trailing periods.  The corresponding code for a custom estimator has the trailing period.
diff: @@ -375,7 +375,7 @@ estimator = tf.estimator.LinearRegressor(feature_columns=feature_columns)
  x_train = np.array([1., 2., 3., 4.])
  y_train = np.array([0., -1., -2., -3.])
  x_eval = np.array([2., 5., 8., 1.])
  -y_eval = np.array([-1.01, -4.1, -7, 0.])
  +y_eval = np.array([-1.01, -4.1, -7., 0.])
  input_fn = tf.estimator.inputs.numpy_input_fn(
  {"x": x_train}, y_train, batch_size=4, num_epochs=None, shuffle=True)
  train_input_fn = tf.estimator.inputs.numpy_input_fn(
  