From 2efbc3ac21e860b3f59a573bd85de5d667d3d2ff Mon Sep 17 00:00:00 2001
From: RerankerGuo <121015044+RerankerGuo@users.noreply.github.com>
Date: Tue, 4 Aug 2026 17:59:37 +0800
Subject: [PATCH] fix(internvl): pass max patch count to vllm

Forward the InternVL MAX_NUM setting as max_dynamic_patch through vLLM multimodal processor kwargs while preserving explicit per-request overrides.

Fixes #7631

Test: python -m unittest tests.general.test_internvl_template
---
 swift/template/templates/internvl.py    |  1 +
 tests/general/test_internvl_template.py | 44 +++++++++++++++++++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 tests/general/test_internvl_template.py

diff --git a/swift/template/templates/internvl.py b/swift/template/templates/internvl.py
index 444a161a92..faac371da5 100644
--- a/swift/template/templates/internvl.py
+++ b/swift/template/templates/internvl.py
@@ -30,6 +30,7 @@ def init_env_args(self):
     def replace_tag(self, media_type: Literal['image', 'video', 'audio'], index: int,
                     inputs: StdTemplateInputs) -> List[Context]:
         if self.mode == 'vllm':
+            inputs.mm_processor_kwargs.setdefault('max_dynamic_patch', self.max_num)
             image_context = ['<image>\n']
         else:
             image_context = ['<img>', [-100], '</img>\n']
diff --git a/tests/general/test_internvl_template.py b/tests/general/test_internvl_template.py
new file mode 100644
index 0000000000..1661128fe3
--- /dev/null
+++ b/tests/general/test_internvl_template.py
@@ -0,0 +1,44 @@
+import unittest
+from types import SimpleNamespace
+
+from swift.template.templates.internvl import InternvlTemplate
+
+
+class TestInternvlTemplate(unittest.TestCase):
+
+    @staticmethod
+    def _template(mode):
+        template = object.__new__(InternvlTemplate)
+        template.mode = mode
+        template.max_num = 6
+        return template
+
+    def test_vllm_receives_max_dynamic_patch(self):
+        template = self._template('vllm')
+        inputs = SimpleNamespace(mm_processor_kwargs={})
+
+        context = template.replace_tag('image', 0, inputs)
+
+        self.assertEqual(context, ['<image>\n'])
+        self.assertEqual(inputs.mm_processor_kwargs, {'max_dynamic_patch': 6})
+
+    def test_vllm_preserves_explicit_max_dynamic_patch(self):
+        template = self._template('vllm')
+        inputs = SimpleNamespace(mm_processor_kwargs={'max_dynamic_patch': 4})
+
+        template.replace_tag('image', 0, inputs)
+
+        self.assertEqual(inputs.mm_processor_kwargs, {'max_dynamic_patch': 4})
+
+    def test_transformers_does_not_receive_vllm_processor_kwargs(self):
+        template = self._template('transformers')
+        inputs = SimpleNamespace(mm_processor_kwargs={})
+
+        context = template.replace_tag('image', 0, inputs)
+
+        self.assertEqual(context, ['<img>', [-100], '</img>\n'])
+        self.assertEqual(inputs.mm_processor_kwargs, {})
+
+
+if __name__ == '__main__':
+    unittest.main()