fix bug in output check (#55164)

test/legacy_test/eager_op_test.py

@@ -1146,18 +1146,22 @@ class OpTest(unittest.TestCase):
             fetch_list=fetch_list,
             return_numpy=False,
         )
+        assert len(outs) == len(
+            ir_outs
+        ), "Fetch result should have same length when executed in new ir"
+        for i in range(len(outs)):
             np.testing.assert_array_equal(
-            outs,
-            ir_outs,
-            err_msg='Operator ('
+                outs[i],
+                ir_outs[i],
+                err_msg='Operator Check ('
                 + self.op_type
                 + ') has diff at '
                 + str(place)
                 + '\nExpect '
-            + str(outs)
+                + str(outs[i])
                 + '\n'
                 + 'But Got'
-            + str(ir_outs)
+                + str(ir_outs[i])
                 + ' in class '
                 + self.__class__.__name__,
             )