[Frontend] [Core] Add Tensorizer support for V1, LoRA adapter serialization and deserialization (#17926)

Signed-off-by: Sanger Steel <sangersteel@gmail.com>

tests/entrypoints/openai/test_tensorizer_entrypoint.py

@@ -0,0 +1,97 @@
+# SPDX-License-Identifier: Apache-2.0
+import gc
+import json
+import tempfile
+
+import openai
+import pytest
+import pytest_asyncio
+import torch.cuda
+
+from vllm.engine.arg_utils import EngineArgs
+from vllm.model_executor.model_loader.tensorizer import (
+    TensorizerConfig, tensorize_lora_adapter, tensorize_vllm_model)
+
+from ...utils import RemoteOpenAIServer
+
+MODEL_NAME = "unsloth/llama-3.2-1b-Instruct"
+LORA_PATH = "davzoku/finqa_adapter_1b"
+
+
+def _cleanup():
+    gc.collect()
+    torch.cuda.empty_cache()
+
+
+@pytest.fixture(autouse=True)
+def cleanup():
+    _cleanup()
+
+
+@pytest.fixture(scope='module')
+def tmp_dir():
+    with tempfile.TemporaryDirectory() as path:
+        yield path
+
+
+@pytest.fixture(scope='module')
+def model_uri(tmp_dir):
+    yield f"{tmp_dir}/model.tensors"
+
+
+@pytest.fixture(scope="module")
+def tensorize_model_and_lora(tmp_dir, model_uri):
+    tensorizer_config = TensorizerConfig(tensorizer_uri=model_uri,
+                                         lora_dir=tmp_dir)
+    args = EngineArgs(model=MODEL_NAME, device="cuda")
+
+    tensorize_lora_adapter(LORA_PATH, tensorizer_config)
+    tensorize_vllm_model(args, tensorizer_config)
+
+    # Manually invoke a _cleanup() here, as the cleanup()
+    # fixture won't be guaranteed to be called after this
+    # when this fixture is used for a test
+    _cleanup()
+    yield
+
+
+@pytest.fixture(scope="module")
+def server(model_uri, tensorize_model_and_lora):
+    model_loader_extra_config = {
+        "tensorizer_uri": model_uri,
+    }
+
+    ## Start OpenAI API server
+    args = [
+        "--load-format", "tensorizer", "--device", "cuda",
+        "--model-loader-extra-config",
+        json.dumps(model_loader_extra_config), "--enable-lora"
+    ]
+
+    with RemoteOpenAIServer(MODEL_NAME, args) as remote_server:
+        yield remote_server
+
+
+@pytest_asyncio.fixture
+async def client(server):
+    async with server.get_async_client() as async_client:
+        yield async_client
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("model_name", [MODEL_NAME])
+async def test_single_completion(client: openai.AsyncOpenAI, model_name: str):
+    _cleanup()
+    completion = await client.completions.create(model=model_name,
+                                                 prompt="Hello, my name is",
+                                                 max_tokens=5,
+                                                 temperature=0.0)
+
+    assert completion.id is not None
+    assert completion.choices is not None and len(completion.choices) == 1
+    assert completion.model == MODEL_NAME
+    assert len(completion.choices) == 1
+    assert len(completion.choices[0].text) >= 5
+    assert completion.choices[0].finish_reason == "length"
+    assert completion.usage == openai.types.CompletionUsage(
+        completion_tokens=5, prompt_tokens=6, total_tokens=11)