fix: diagnose vllm serve runtime issues (#1198)

tests/test_cookbook_diagnosis.py

@@ -0,0 +1,15 @@
+from routes.cookbook_helpers import _diagnose_serve_output
+
+
+def test_diagnose_vllm_modelopt_lm_head_error():
+    output = """
+    ValueError: There is no module or parameter named 'lm_head.input_scale'
+    Engine core initialization failed.
+    """
+
+    diagnosis = _diagnose_serve_output(output)
+
+    assert diagnosis is not None
+    assert "ModelOpt LM-head" in diagnosis["message"]
+    assert diagnosis["suggestions"][0]["op"] == "manual"
+    assert "provides this CLI" in diagnosis["suggestions"][0]["label"]