Bug-fix to skip keras LSTM test for TF2.1 (#1754)

Signed-off-by: congyc <[email protected]>

Co-authored-by: congyc <[email protected]>

Author: q-ycong-p

tests/test_lstm.py

@@ -729,6 +729,7 @@ def func(x, y1, y2):
                            require_lstm_count=2)
 
     @check_tf_min_version("2.0")
+    @skip_tf_versions("2.1", "Bug in TF 2.1")
     def test_keras_lstm(self):
         in_shape = [10, 3]
         x_val = np.random.uniform(size=[2, 10, 3]).astype(np.float32)