reopen: llava-next fails to consider padding_side during Training (#32679)

restore #32386

tests/models/llava_next/test_modeling_llava_next.py

@@ -549,6 +549,24 @@ class LlavaNextForConditionalGenerationIntegrationTest(unittest.TestCase):
             output_train = model(**inputs_batched, output_hidden_states=True)
         self.assertTrue((output_train.hidden_states[0][0, -1414:, ...] == 0).all().item())
 
+        with self.assertLogs("transformers", level="WARNING") as logs:
+            model.padding_side = "left"
+            model.train()
+            model(**inputs_batched, output_hidden_states=True)
+
+            self.assertIn(
+                "Padding side is set to 'left' but the model is in training mode. For training", logs.output[0]
+            )
+
+        with self.assertLogs("transformers", level="WARNING") as logs:
+            model.padding_side = "right"
+            model.eval()
+            model(**inputs_batched, output_hidden_states=True)
+
+            self.assertIn(
+                "Padding side is set to 'right' but the model is in inference mode. For correct", logs.output[0]
+            )
+
     @slow
     @require_bitsandbytes
     def test_expansion_in_processing(self):