improve relu6 test

Author: guschmue

tests/test_backend.py

@@ -900,10 +900,9 @@ def test_tanh(self):
         _ = tf.identity(x_, name=_TFOUTPUT)
         self._run_test_case([_OUTPUT], {_INPUT: x_val}, rtol=1e-05)
 
-    @check_onnxruntime_incompatibility("Max")
     def test_relu6(self):
-        x_val = np.array([0.5, 1.0, -0.5, -1.0], dtype=np.float32).reshape((2, 2))
-        x = tf.placeholder(tf.float32, [2, 2], name=_TFINPUT)
+        x_val = np.array([0.5, 1.0, -0.5, -1.0, 6, 7], dtype=np.float32).reshape((2, 3))
+        x = tf.placeholder(tf.float32, x_val.shape, name=_TFINPUT)
         x_ = tf.nn.relu6(x)
         _ = tf.identity(x_, name=_TFOUTPUT)
         self._run_test_case([_OUTPUT], {_INPUT: x_val})