[Model][Feat] Support Minimax-H3 quality grading requests through dynamic loading/unloading with Cache-DiT (#5853)

Signed-off-by: mglyn <1203789601@qq.com>

tests/diffusion/test_diffusion_model_runner.py

@@ -162,6 +162,21 @@ def _fake_platform_for_peak_memory():
     )
 
 
+def test_request_scoped_cache_dit_lifecycle_is_pipeline_opt_in():
+    events = []
+    plain_pipeline = object()
+    request_scoped_pipeline = SimpleNamespace(
+        adopt_cache_dit_backend=lambda backend: events.append(backend),
+        is_cache_dit_enabled=lambda: True,
+    )
+    backend = object()
+
+    assert not model_runner_module.adopt_request_scoped_cache_dit(plain_pipeline, backend)
+    assert model_runner_module.adopt_request_scoped_cache_dit(request_scoped_pipeline, backend)
+    assert model_runner_module.is_request_scoped_cache_dit_enabled(request_scoped_pipeline)
+    assert events == [backend]
+
+
 def _make_runner(cache_backend, cache_backend_name: str, enable_cache_dit_summary: bool = True):
     runner = object.__new__(DiffusionModelRunner)
     runner.vllm_config = object()
@@ -419,6 +434,33 @@ def test_execute_model_emits_cache_summary_with_active_cache_dit_backend(monkeyp
     assert cache_backend.refresh_calls == [(runner.pipeline, 4, True)]
 
 
+@pytest.mark.core_model
+@hardware_test(res={"cuda": "L4"}, num_cards=1)
+@pytest.mark.parametrize("cache_dit_enabled", [False, True])
+def test_execute_model_cache_summary_follows_pipeline_owned_cache_dit_state(monkeypatch, cache_dit_enabled):
+    runner = _make_runner(cache_backend=None, cache_backend_name="cache_dit")
+    runner.pipeline.adopt_cache_dit_backend = lambda backend: None
+    runner.pipeline.is_cache_dit_enabled = lambda: cache_dit_enabled
+    req = _make_request()
+
+    cache_summary_calls = []
+
+    monkeypatch.setattr(model_runner_module, "set_forward_context", _noop_forward_context)
+    monkeypatch.setattr(model_runner_module.current_omni_platform, "reset_peak_memory_stats", lambda: None)
+    monkeypatch.setattr(model_runner_module.current_omni_platform, "max_memory_reserved", lambda: 0)
+    monkeypatch.setattr(model_runner_module.current_omni_platform, "max_memory_allocated", lambda: 0)
+    monkeypatch.setattr(
+        model_runner_module,
+        "cache_summary",
+        lambda pipeline, details: cache_summary_calls.append((pipeline, details)),
+    )
+
+    output = DiffusionModelRunner.execute_model(runner, req)
+
+    assert output.output == "ok"
+    assert cache_summary_calls == ([(runner.pipeline, True)] if cache_dit_enabled else [])
+
+
 @pytest.mark.core_model
 @pytest.mark.cpu
 def test_execute_model_passes_single_request_batch_to_non_admission_pipeline(monkeypatch):