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

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

.buildkite/test-pipeline.yaml

@@ -128,6 +128,7 @@ steps:
   - VLLM_USE_V1=0 pytest -v -s entrypoints/llm/test_guided_generate.py # it needs a clean process
   - pytest -v -s entrypoints/openai --ignore=entrypoints/openai/test_oot_registration.py  --ignore=entrypoints/openai/test_chat_with_tool_reasoning.py --ignore=entrypoints/openai/correctness/
   - pytest -v -s entrypoints/test_chat_utils.py
+  - pytest -v -s entrypoints/openai/test_tensorizer_entrypoint.py
   - VLLM_USE_V1=0 pytest -v -s entrypoints/offline_mode # Needs to avoid interference with other tests
 
 - label: Distributed Tests (4 GPUs) # 10min

examples/other/tensorize_vllm_model.py

@@ -6,11 +6,12 @@ import json
 import os
 import uuid
 
-from vllm import LLM
+from vllm import LLM, SamplingParams
 from vllm.engine.arg_utils import EngineArgs
-from vllm.model_executor.model_loader.tensorizer import (TensorizerArgs,
-                                                         TensorizerConfig,
-                                                         tensorize_vllm_model)
+from vllm.lora.request import LoRARequest
+from vllm.model_executor.model_loader.tensorizer import (
+    TensorizerArgs, TensorizerConfig, tensorize_lora_adapter,
+    tensorize_vllm_model)
 from vllm.utils import FlexibleArgumentParser
 
 # yapf conflicts with isort for this docstring
@@ -27,7 +28,7 @@ https://github.com/coreweave/tensorizer
 To serialize a model, install vLLM from source, then run something 
 like this from the root level of this repository:
 
-python -m examples.other.tensorize_vllm_model \
+python examples/other/tensorize_vllm_model.py \
    --model facebook/opt-125m \
    serialize \
    --serialized-directory s3://my-bucket \
@@ -47,7 +48,7 @@ providing a `--keyfile` argument.
 To deserialize a model, you can run something like this from the root 
 level of this repository:
 
-python -m examples.other.tensorize_vllm_model \
+python examples/other/tensorize_vllm_model.py \
    --model EleutherAI/gpt-j-6B \
    --dtype float16 \
    deserialize \
@@ -69,7 +70,7 @@ For more information on the available arguments for serializing, run
 
 Or for deserializing:
 
-`python -m examples.other.tensorize_vllm_model deserialize --help`.
+`python examples/other/tensorize_vllm_model.py deserialize --help`.
 
 Once a model is serialized, tensorizer can be invoked with the `LLM` class 
 directly to load models:
@@ -90,11 +91,27 @@ TensorizerConfig arguments desired.
 In order to see all of the available arguments usable to configure 
 loading with tensorizer that are given to `TensorizerConfig`, run:
 
-`python -m examples.other.tensorize_vllm_model deserialize --help`
+`python examples/other/tensorize_vllm_model.py deserialize --help`
 
 under the `tensorizer options` section. These can also be used for
 deserialization in this example script, although `--tensorizer-uri` and
 `--path-to-tensors` are functionally the same in this case.
+
+Tensorizer can also be used to save and load LoRA adapters. A LoRA adapter
+can be serialized directly with the path to the LoRA adapter on HF Hub and
+a TensorizerConfig object. In this script, passing a HF id to a LoRA adapter
+will serialize the LoRA adapter artifacts to `--serialized-directory`.
+
+You can then use the LoRA adapter with `vllm serve`, for instance, by ensuring 
+the LoRA artifacts are in your model artifacts directory and specifying 
+`--enable-lora`. For instance:
+
+```
+vllm serve <model_path> \
+    --load-format tensorizer \
+    --model-loader-extra-config '{"tensorizer_uri": "<model_path>.tensors"}' \
+    --enable-lora
+```
 """
 
 
@@ -107,6 +124,19 @@ def parse_args():
         "also supported, although libsodium must be installed to "
         "use it.")
     parser = EngineArgs.add_cli_args(parser)
+
+    parser.add_argument(
+        "--lora-path",
+        type=str,
+        required=False,
+        help="Path to a LoRA adapter to "
+        "serialize along with model tensors. This can then be deserialized "
+        "along with the model by passing a tensorizer_config kwarg to "
+        "LoRARequest with type TensorizerConfig. See the docstring for this "
+        "for a usage example."
+
+    )
+
     subparsers = parser.add_subparsers(dest='command')
 
     serialize_parser = subparsers.add_parser(
@@ -169,11 +199,42 @@ def parse_args():
 
 
 def deserialize():
-    llm = LLM(model=args.model,
-              load_format="tensorizer",
-              tensor_parallel_size=args.tensor_parallel_size,
-              model_loader_extra_config=tensorizer_config
-    )
+    if args.lora_path:
+        tensorizer_config.lora_dir = tensorizer_config.tensorizer_dir
+        llm = LLM(model=args.model,
+                  load_format="tensorizer",
+                  tensor_parallel_size=args.tensor_parallel_size,
+                  model_loader_extra_config=tensorizer_config,
+                  enable_lora=True,
+        )
+        sampling_params = SamplingParams(
+            temperature=0,
+            max_tokens=256,
+            stop=["[/assistant]"]
+        )
+
+        # Truncating this as the extra text isn't necessary
+        prompts = [
+            "[user] Write a SQL query to answer the question based on ..."
+        ]
+
+        # Test LoRA load
+        print(
+            llm.generate(
+            prompts,
+            sampling_params,
+            lora_request=LoRARequest("sql-lora",
+                                     1,
+                                     args.lora_path,
+                                     tensorizer_config = tensorizer_config)
+            )
+        )
+    else:
+        llm = LLM(model=args.model,
+                  load_format="tensorizer",
+                  tensor_parallel_size=args.tensor_parallel_size,
+                  model_loader_extra_config=tensorizer_config
+        )
     return llm
 
 
@@ -197,7 +258,10 @@ if __name__ == '__main__':
 
     model_name = model_ref.split("/")[1]
 
-    keyfile = args.keyfile if args.keyfile else None
+    if args.command == "serialize" or args.command == "deserialize":
+        keyfile = args.keyfile
+    else:
+        keyfile = None
 
     if args.model_loader_extra_config:
         config = json.loads(args.model_loader_extra_config)
@@ -228,6 +292,10 @@ if __name__ == '__main__':
             encryption_keyfile=keyfile,
             **credentials)
 
+        if args.lora_path:
+            tensorizer_config.lora_dir = tensorizer_config.tensorizer_dir
+            tensorize_lora_adapter(args.lora_path, tensorizer_config)
+
         tensorize_vllm_model(engine_args, tensorizer_config)
 
     elif args.command == "deserialize":

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)

tests/lora/test_llama_tp.py

@@ -1,12 +1,17 @@
 # SPDX-License-Identifier: Apache-2.0
+import subprocess
+import sys
+from typing import Union
 
 import pytest
 import ray
 
 import vllm
+from vllm import LLM
 from vllm.lora.request import LoRARequest
+from vllm.model_executor.model_loader.tensorizer import TensorizerConfig
 
-from ..utils import create_new_process_for_each_test, multi_gpu_test
+from ..utils import VLLM_PATH, create_new_process_for_each_test, multi_gpu_test
 
 MODEL_PATH = "meta-llama/Llama-2-7b-hf"
 
@@ -36,7 +41,10 @@ def v1(run_with_both_engines_lora):
     pass
 
 
-def do_sample(llm: vllm.LLM, lora_path: str, lora_id: int) -> list[str]:
+def do_sample(llm: vllm.LLM,
+              lora_path: str,
+              lora_id: int,
+              tensorizer_config_dict: Union[dict, None] = None) -> list[str]:
     prompts = [
         "[user] Write a SQL query to answer the question based on the table schema.\n\n context: CREATE TABLE table_name_74 (icao VARCHAR, airport VARCHAR)\n\n question: Name the ICAO for lilongwe international airport [/user] [assistant]",  # noqa: E501
         "[user] Write a SQL query to answer the question based on the table schema.\n\n context: CREATE TABLE table_name_11 (nationality VARCHAR, elector VARCHAR)\n\n question: When Anchero Pantaleone was the elector what is under nationality? [/user] [assistant]",  # noqa: E501
@@ -45,15 +53,28 @@ def do_sample(llm: vllm.LLM, lora_path: str, lora_id: int) -> list[str]:
         "[user] Write a SQL query to answer the question based on the table schema.\n\n context: CREATE TABLE table_name_60 (pick INTEGER, former_wnba_team VARCHAR)\n\n question: What pick was a player that previously played for the Minnesota Lynx? [/user] [assistant]",  # noqa: E501
         "[user] Write a SQL query to answer the question based on the table schema.\n\n context: CREATE TABLE table_28138035_4 (womens_doubles VARCHAR, mens_singles VARCHAR)\n\n question: Name the women's doubles for werner schlager [/user] [assistant]"  # noqa: E501
     ]
+
     sampling_params = vllm.SamplingParams(temperature=0,
                                           max_tokens=256,
                                           skip_special_tokens=False,
                                           stop=["[/assistant]"])
-    outputs = llm.generate(
-        prompts,
-        sampling_params,
-        lora_request=LoRARequest(str(lora_id), lora_id, lora_path)
-        if lora_id else None)
+
+    if tensorizer_config_dict is not None:
+        outputs = llm.generate(
+            prompts,
+            sampling_params,
+            lora_request=LoRARequest(
+                str(lora_id),
+                lora_id,
+                lora_path,
+                tensorizer_config_dict=tensorizer_config_dict)
+            if lora_id else None)
+    else:
+        outputs = llm.generate(
+            prompts,
+            sampling_params,
+            lora_request=LoRARequest(str(lora_id), lora_id, lora_path)
+            if lora_id else None)
     # Print the outputs.
     generated_texts: list[str] = []
     for output in outputs:
@@ -64,18 +85,32 @@ def do_sample(llm: vllm.LLM, lora_path: str, lora_id: int) -> list[str]:
     return generated_texts
 
 
-def generate_and_test(llm, sql_lora_files):
+def generate_and_test(llm,
+                      sql_lora_files,
+                      tensorizer_config_dict: Union[dict, None] = None):
     print("lora adapter created")
-    assert do_sample(llm, sql_lora_files, lora_id=0) == EXPECTED_NO_LORA_OUTPUT
+    assert do_sample(llm,
+                     sql_lora_files,
+                     tensorizer_config_dict=tensorizer_config_dict,
+                     lora_id=0) == EXPECTED_NO_LORA_OUTPUT
 
     print("lora 1")
-    assert do_sample(llm, sql_lora_files, lora_id=1) == EXPECTED_LORA_OUTPUT
+    assert do_sample(llm,
+                     sql_lora_files,
+                     tensorizer_config_dict=tensorizer_config_dict,
+                     lora_id=1) == EXPECTED_LORA_OUTPUT
 
     print("no lora")
-    assert do_sample(llm, sql_lora_files, lora_id=0) == EXPECTED_NO_LORA_OUTPUT
+    assert do_sample(llm,
+                     sql_lora_files,
+                     tensorizer_config_dict=tensorizer_config_dict,
+                     lora_id=0) == EXPECTED_NO_LORA_OUTPUT
 
     print("lora 2")
-    assert do_sample(llm, sql_lora_files, lora_id=2) == EXPECTED_LORA_OUTPUT
+    assert do_sample(llm,
+                     sql_lora_files,
+                     tensorizer_config_dict=tensorizer_config_dict,
+                     lora_id=2) == EXPECTED_LORA_OUTPUT
 
     print("removing lora")
 
@@ -153,3 +188,64 @@ def test_llama_lora_tp4_fully_sharded_loras(sql_lora_files):
         enable_chunked_prefill=True,
     )
     generate_and_test(llm, sql_lora_files)
+
+
+@multi_gpu_test(num_gpus=2)
+@create_new_process_for_each_test()
+def test_tp2_serialize_and_deserialize_lora(tmp_path, sql_lora_files,
+                                            sql_lora_huggingface_id):
+
+    # Run the tensorizing of the LoRA adapter and the model in a subprocess
+    # to guarantee cleanup
+
+    tp_size = 2
+    model_name = "model-rank-%03d.tensors"
+
+    model_ref = MODEL_PATH
+    lora_path = sql_lora_huggingface_id
+    suffix = "test"
+    try:
+        result = subprocess.run([
+            sys.executable,
+            f"{VLLM_PATH}/examples/other/tensorize_vllm_model.py", "--model",
+            MODEL_PATH, "--lora-path", lora_path, "--tensor-parallel-size",
+            str(tp_size), "serialize", "--serialized-directory",
+            str(tmp_path), "--suffix", suffix
+        ],
+                                check=True,
+                                capture_output=True,
+                                text=True)
+    except subprocess.CalledProcessError as e:
+        print("Tensorizing failed.")
+        print("STDOUT:\n", e.stdout)
+        print("STDERR:\n", e.stderr)
+        raise
+
+    print("STDOUT:\n", result.stdout)
+
+    model_uri = tmp_path / "vllm" / model_ref / suffix / model_name
+    tensorizer_config = TensorizerConfig(tensorizer_uri=str(model_uri))
+    tensorizer_config.lora_dir = tensorizer_config.tensorizer_dir
+
+    loaded_vllm_model = LLM(model=model_ref,
+                            load_format="tensorizer",
+                            enable_lora=True,
+                            enforce_eager=True,
+                            model_loader_extra_config=tensorizer_config,
+                            max_num_seqs=13,
+                            tensor_parallel_size=2,
+                            max_loras=2)
+
+    tensorizer_config_dict = tensorizer_config.to_dict()
+
+    print("lora adapter created")
+    assert do_sample(loaded_vllm_model,
+                     sql_lora_files,
+                     tensorizer_config_dict=tensorizer_config_dict,
+                     lora_id=0) == EXPECTED_NO_LORA_OUTPUT
+
+    print("lora 1")
+    assert do_sample(loaded_vllm_model,
+                     sql_lora_files,
+                     tensorizer_config_dict=tensorizer_config_dict,
+                     lora_id=1) == EXPECTED_LORA_OUTPUT

tests/tensorizer_loader/conftest.py

@@ -5,14 +5,6 @@ from vllm.distributed import cleanup_dist_env_and_memory
 from vllm.model_executor.model_loader.tensorizer import TensorizerConfig
 
 
-@pytest.fixture(scope="function", autouse=True)
-def use_v0_only(monkeypatch):
-    """
-    Tensorizer only tested on V0 so far.
-    """
-    monkeypatch.setenv('VLLM_USE_V1', '0')
-
-
 @pytest.fixture(autouse=True)
 def cleanup():
     cleanup_dist_env_and_memory(shutdown_ray=True)

tests/tensorizer_loader/test_tensorizer.py

@@ -1,17 +1,13 @@
 # SPDX-License-Identifier: Apache-2.0
 
 import gc
-import json
 import os
 import pathlib
 import subprocess
-from functools import partial
 from unittest.mock import MagicMock, patch
 
-import openai
 import pytest
 import torch
-from huggingface_hub import snapshot_download
 
 from vllm import SamplingParams
 from vllm.engine.arg_utils import EngineArgs
@@ -22,12 +18,11 @@ from vllm.model_executor.model_loader.tensorizer import (TensorizerConfig,
                                                          is_vllm_tensorized,
                                                          load_with_tensorizer,
                                                          open_stream,
-                                                         serialize_vllm_model,
                                                          tensorize_vllm_model)
 # yapf: enable
-from vllm.utils import PlaceholderModule, import_from_path
+from vllm.utils import PlaceholderModule
 
-from ..utils import VLLM_PATH, RemoteOpenAIServer
+from ..utils import VLLM_PATH
 
 try:
     from tensorizer import EncryptionParams
@@ -103,6 +98,7 @@ def test_can_deserialize_s3(vllm_runner):
 @pytest.mark.skipif(not is_curl_installed(), reason="cURL is not installed")
 def test_deserialized_encrypted_vllm_model_has_same_outputs(
         vllm_runner, tmp_path):
+    args = EngineArgs(model=model_ref)
     with vllm_runner(model_ref) as vllm_model:
         model_path = tmp_path / (model_ref + ".tensors")
         key_path = tmp_path / (model_ref + ".key")
@@ -110,15 +106,13 @@ def test_deserialized_encrypted_vllm_model_has_same_outputs(
 
         outputs = vllm_model.generate(prompts, sampling_params)
 
-        config_for_serializing = TensorizerConfig(tensorizer_uri=model_path,
-                                                  encryption_keyfile=key_path)
+    config_for_serializing = TensorizerConfig(tensorizer_uri=str(model_path),
+                                              encryption_keyfile=str(key_path))
 
-        vllm_model.apply_model(
-            partial(serialize_vllm_model,
-                    tensorizer_config=config_for_serializing))
+    tensorize_vllm_model(args, config_for_serializing)
 
-    config_for_deserializing = TensorizerConfig(tensorizer_uri=model_path,
-                                                encryption_keyfile=key_path)
+    config_for_deserializing = TensorizerConfig(
+        tensorizer_uri=str(model_path), encryption_keyfile=str(key_path))
 
     with vllm_runner(model_ref,
                      load_format="tensorizer",
@@ -154,113 +148,46 @@ def test_deserialized_hf_model_has_same_outputs(hf_runner, vllm_runner,
         assert outputs == deserialized_outputs
 
 
-def test_vllm_model_can_load_with_lora(vllm_runner, tmp_path):
-    multilora_inference = import_from_path(
-        "examples.offline_inference.multilora_inference",
-        EXAMPLES_PATH / "offline_inference/multilora_inference.py",
-    )
-
-    model_ref = "meta-llama/Llama-2-7b-hf"
-    lora_path = snapshot_download(repo_id="yard1/llama-2-7b-sql-lora-test")
-    test_prompts = multilora_inference.create_test_prompts(lora_path)
-
-    # Serialize model before deserializing and binding LoRA adapters
-    with vllm_runner(model_ref) as vllm_model:
-        model_path = tmp_path / (model_ref + ".tensors")
-
-        vllm_model.apply_model(
-            partial(
-                serialize_vllm_model,
-                tensorizer_config=TensorizerConfig(tensorizer_uri=model_path)))
-
-    with vllm_runner(
-            model_ref,
-            load_format="tensorizer",
-            model_loader_extra_config=TensorizerConfig(
-                tensorizer_uri=model_path,
-                num_readers=1,
-            ),
-            enable_lora=True,
-            max_loras=1,
-            max_lora_rank=8,
-            max_cpu_loras=2,
-            max_num_seqs=50,
-            max_model_len=1000,
-    ) as loaded_vllm_model:
-        multilora_inference.process_requests(
-            loaded_vllm_model.model.llm_engine, test_prompts)
-
-        assert loaded_vllm_model
-
-
-def test_load_without_tensorizer_load_format(vllm_runner):
+def test_load_without_tensorizer_load_format(vllm_runner, capfd):
     model = None
-    with pytest.raises(ValueError):
+    try:
         model = vllm_runner(
             model_ref,
             model_loader_extra_config=TensorizerConfig(tensorizer_uri="test"))
-    del model
-    gc.collect()
-    torch.cuda.empty_cache()
+    except RuntimeError:
+        out, err = capfd.readouterr()
+        combined_output = out + err
+        assert ("ValueError: Model loader extra config "
+                "is not supported for load "
+                "format LoadFormat.AUTO") in combined_output
+    finally:
+        del model
+        gc.collect()
+        torch.cuda.empty_cache()
 
 
-@pytest.mark.skipif(not is_curl_installed(), reason="cURL is not installed")
-def test_openai_apiserver_with_tensorizer(vllm_runner, tmp_path):
-    ## Serialize model
-    with vllm_runner(model_ref) as vllm_model:
-        model_path = tmp_path / (model_ref + ".tensors")
-
-        vllm_model.apply_model(
-            partial(
-                serialize_vllm_model,
-                tensorizer_config=TensorizerConfig(tensorizer_uri=model_path)))
-
-        model_loader_extra_config = {
-            "tensorizer_uri": str(model_path),
-        }
-
-    ## Start OpenAI API server
-    openai_args = [
-        "--dtype",
-        "float16",
-        "--load-format",
-        "tensorizer",
-        "--model-loader-extra-config",
-        json.dumps(model_loader_extra_config),
-    ]
-
-    with RemoteOpenAIServer(model_ref, openai_args) as server:
-        print("Server ready.")
-
-        client = server.get_client()
-        completion = client.completions.create(model=model_ref,
-                                               prompt="Hello, my name is",
-                                               max_tokens=5,
-                                               temperature=0.0)
-
-        assert completion.id is not None
-        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)
-
-
-def test_raise_value_error_on_invalid_load_format(vllm_runner):
+def test_raise_value_error_on_invalid_load_format(vllm_runner, capfd):
     model = None
-    with pytest.raises(ValueError):
+    try:
         model = vllm_runner(
             model_ref,
             load_format="safetensors",
             model_loader_extra_config=TensorizerConfig(tensorizer_uri="test"))
-    del model
-    gc.collect()
-    torch.cuda.empty_cache()
+    except RuntimeError:
+        out, err = capfd.readouterr()
+
+        combined_output = out + err
+        assert ("ValueError: Model loader extra config is not supported "
+                "for load format LoadFormat.SAFETENSORS") in combined_output
+    finally:
+        del model
+        gc.collect()
+        torch.cuda.empty_cache()
 
 
 @pytest.mark.skipif(torch.cuda.device_count() < 2, reason="Requires 2 GPUs")
-def test_tensorizer_with_tp_path_without_template(vllm_runner):
-    with pytest.raises(ValueError):
+def test_tensorizer_with_tp_path_without_template(vllm_runner, capfd):
+    try:
         model_ref = "EleutherAI/pythia-1.4b"
         tensorized_path = f"s3://tensorized/{model_ref}/fp16/model.tensors"
 
@@ -275,6 +202,13 @@ def test_tensorizer_with_tp_path_without_template(vllm_runner):
             tensor_parallel_size=2,
             disable_custom_all_reduce=True,
         )
+    except RuntimeError:
+        out, err = capfd.readouterr()
+        combined_output = out + err
+        assert ("ValueError: For a sharded model, tensorizer_uri "
+                "should include a string format template like '%04d' "
+                "to be formatted with the rank "
+                "of the shard") in combined_output
 
 
 @pytest.mark.skipif(torch.cuda.device_count() < 2, reason="Requires 2 GPUs")
@@ -288,7 +222,6 @@ def test_deserialized_encrypted_vllm_model_with_tp_has_same_outputs(
             enforce_eager=True,
     ) as base_model:
         outputs = base_model.generate(prompts, sampling_params)
-        base_model.model.llm_engine.model_executor.shutdown()
 
     # load model with two shards and serialize with encryption
     model_path = str(tmp_path / (model_ref + "-%02d.tensors"))
@@ -296,7 +229,7 @@ def test_deserialized_encrypted_vllm_model_with_tp_has_same_outputs(
 
     tensorizer_config = TensorizerConfig(
         tensorizer_uri=model_path,
-        encryption_keyfile=key_path,
+        encryption_keyfile=str(key_path),
     )
 
     tensorize_vllm_model(
@@ -331,14 +264,13 @@ def test_vllm_tensorized_model_has_same_outputs(vllm_runner, tmp_path):
     model_ref = "facebook/opt-125m"
     model_path = tmp_path / (model_ref + ".tensors")
     config = TensorizerConfig(tensorizer_uri=str(model_path))
+    args = EngineArgs(model=model_ref, device="cuda")
 
     with vllm_runner(model_ref) as vllm_model:
         outputs = vllm_model.generate(prompts, sampling_params)
 
-        vllm_model.apply_model(
-            partial(serialize_vllm_model, tensorizer_config=config))
-
-        assert is_vllm_tensorized(config)
+    tensorize_vllm_model(args, config)
+    assert is_vllm_tensorized(config)
 
     with vllm_runner(model_ref,
                      load_format="tensorizer",

vllm/engine/arg_utils.py

@@ -1195,8 +1195,7 @@ class EngineArgs:
         #############################################################
         # Unsupported Feature Flags on V1.
 
-        if (self.load_format == LoadFormat.TENSORIZER.value
-                or self.load_format == LoadFormat.SHARDED_STATE.value):
+        if self.load_format == LoadFormat.SHARDED_STATE.value:
             _raise_or_fallback(
                 feature_name=f"--load_format {self.load_format}",
                 recommend_to_remove=False)

vllm/lora/models.py

@@ -29,6 +29,7 @@ from vllm.lora.utils import (from_layer, from_layer_logits_processor,
                              get_supported_lora_modules,
                              is_regex_target_modules,
                              parse_fine_tuned_lora_name, replace_submodule)
+from vllm.model_executor.model_loader.tensorizer import TensorizerConfig
 from vllm.model_executor.models import SupportsLoRA, supports_multimodal
 from vllm.model_executor.models.interfaces import is_pooling_model
 from vllm.model_executor.models.module_mapping import MultiModelKeys
@@ -185,19 +186,19 @@ class LoRAModel(AdapterModel):
 
     @classmethod
     def from_local_checkpoint(
-        cls,
-        lora_dir: str,
-        expected_lora_modules: list[str],
-        peft_helper: PEFTHelper,
-        *,
-        lora_model_id: Optional[int] = None,
-        device: str = "cuda",
-        dtype: Optional[torch.dtype] = None,
-        target_embedding_padding: Optional[int] = None,
-        embedding_modules: Optional[dict[str, str]] = None,
-        embedding_padding_modules: Optional[list[str]] = None,
-        weights_mapper: Optional[WeightsMapper] = None,
-    ) -> "LoRAModel":
+            cls,
+            lora_dir: str,
+            expected_lora_modules: list[str],
+            peft_helper: PEFTHelper,
+            *,
+            lora_model_id: Optional[int] = None,
+            device: str = "cuda",
+            dtype: Optional[torch.dtype] = None,
+            target_embedding_padding: Optional[int] = None,
+            embedding_modules: Optional[dict[str, str]] = None,
+            embedding_padding_modules: Optional[list[str]] = None,
+            weights_mapper: Optional[WeightsMapper] = None,
+            tensorizer_config_dict: Optional[dict] = None) -> "LoRAModel":
         """Create a LoRAModel from a local checkpoint.
         
         Args:
@@ -219,10 +220,36 @@ class LoRAModel(AdapterModel):
             lora_dir, "new_embeddings.safetensors")
         new_embeddings_bin_file_path = os.path.join(lora_dir,
                                                     "new_embeddings.bin")
+        tensors: dict[str, torch.Tensor] = {}
+        unexpected_modules: list[Union[list[str], str]] = []
 
-        unexpected_modules: list[Union[list[str], str]]
-        if os.path.isfile(lora_tensor_path):
-            tensors: dict[str, torch.Tensor] = {}
+        def check_unexpected_modules(modules: dict):
+            for lora_module in modules.keys():  # noqa
+                module_name, _, _ = parse_fine_tuned_lora_name(
+                    lora_module, weights_mapper)
+                part_name = module_name.split(".")[-1]
+                if part_name not in expected_lora_modules:
+                    unexpected_modules.append(module_name)
+            if unexpected_modules:
+                raise ValueError(
+                    f"While loading {lora_dir}, expected"
+                    f" target modules in {expected_lora_modules}"
+                    f" but received {unexpected_modules}."
+                    f" Please verify that the loaded LoRA module is correct")
+
+        if tensorizer_config_dict:
+            from tensorizer import TensorDeserializer
+
+            tensorizer_config = TensorizerConfig(**tensorizer_config_dict)
+            lora_tensor_path = os.path.join(tensorizer_config.tensorizer_dir,
+                                            "adapter_model.tensors")
+            tensorizer_args = tensorizer_config._construct_tensorizer_args()
+            tensors = TensorDeserializer(lora_tensor_path,
+                                         dtype=tensorizer_config.dtype,
+                                         **tensorizer_args.deserializer_params)
+            check_unexpected_modules(tensors)
+
+        elif os.path.isfile(lora_tensor_path):
             # Find unexpected modules.
             # Use safetensor key as a source of truth to find expected modules.
             # in peft if you have target_modules A, B, C and C does not exist
@@ -232,20 +259,8 @@ class LoRAModel(AdapterModel):
             unexpected_modules = []
             with safetensors.safe_open(lora_tensor_path,
                                        framework="pt") as f:  # type: ignore
-                for lora_module in f.keys():  # noqa
-                    module_name, _, _ = parse_fine_tuned_lora_name(
-                        lora_module, weights_mapper)
-                    part_name = module_name.split(".")[-1]
-                    if part_name not in expected_lora_modules:
-                        unexpected_modules.append(module_name)
-                if unexpected_modules:
-                    raise ValueError(
-                        f"While loading {lora_dir}, expected"
-                        f" target modules in {expected_lora_modules}"
-                        f" but received {unexpected_modules}."
-                        f" Please verify that the loaded LoRA module is correct"
-                    )
                 # Load tensors if there are only expected modules.
+                check_unexpected_modules(f)
                 for module in f.keys():  # noqa
                     tensors[module] = f.get_tensor(module)
         elif os.path.isfile(lora_bin_file_path):

vllm/lora/peft_helper.py

@@ -10,6 +10,7 @@ from typing import Literal, Optional, Union
 
 from vllm.config import LoRAConfig
 from vllm.logger import init_logger
+from vllm.model_executor.model_loader.tensorizer import TensorizerConfig
 
 logger = init_logger(__name__)
 
@@ -89,12 +90,31 @@ class PEFTHelper:
         return cls(**filtered_dict)
 
     @classmethod
-    def from_local_dir(cls, lora_path: str,
-                       max_position_embeddings: Optional[int]) -> "PEFTHelper":
+    def from_local_dir(
+            cls,
+            lora_path: str,
+            max_position_embeddings: Optional[int],
+            tensorizer_config_dict: Optional[dict] = None) -> "PEFTHelper":
         lora_config_path = os.path.join(lora_path, "adapter_config.json")
 
-        with open(lora_config_path) as f:
-            config = json.load(f)
+        if tensorizer_config_dict:
+            tensorizer_config = TensorizerConfig(**tensorizer_config_dict)
+            tensorizer_args = tensorizer_config._construct_tensorizer_args()
+            from tensorizer.stream_io import open_stream
+            lora_config_path = os.path.join(tensorizer_config.lora_dir,
+                                            "adapter_config.json")
+            with open_stream(lora_config_path,
+                             mode="rb",
+                             **tensorizer_args.stream_params) as f:
+                config = json.load(f)
+
+            logger.info("Successfully deserialized LoRA config from %s",
+                        tensorizer_config.lora_dir)
+
+        else:
+            with open(lora_config_path) as f:
+                config = json.load(f)
+
         config["vllm_max_position_embeddings"] = max_position_embeddings
         return cls.from_dict(config)
 

vllm/lora/request.py

@@ -31,6 +31,7 @@ class LoRARequest(
     lora_local_path: Optional[str] = msgspec.field(default=None)
     long_lora_max_len: Optional[int] = None
     base_model_name: Optional[str] = msgspec.field(default=None)
+    tensorizer_config_dict: Optional[dict] = None
 
     def __post_init__(self):
         if self.lora_local_path:

vllm/lora/worker_manager.py

@@ -100,7 +100,8 @@ class WorkerLoRAManager(AbstractWorkerManager):
             lora_path = get_adapter_absolute_path(lora_request.lora_path)
 
             peft_helper = PEFTHelper.from_local_dir(
-                lora_path, self.max_position_embeddings)
+                lora_path, self.max_position_embeddings,
+                lora_request.tensorizer_config_dict)
 
             # Validates the LoRA configuration against requirements before
             # loading weights, throwing an exception if validation fails.
@@ -125,6 +126,7 @@ class WorkerLoRAManager(AbstractWorkerManager):
                 self.lora_config.lora_extra_vocab_size,
                 embedding_modules=self.embedding_modules,
                 embedding_padding_modules=self.embedding_padding_modules,
+                tensorizer_config_dict=lora_request.tensorizer_config_dict,
                 weights_mapper=hf_to_vllm_mapper)
 
         except FileNotFoundError as e:

vllm/model_executor/model_loader/tensorizer.py

@@ -1,24 +1,28 @@
 # SPDX-License-Identifier: Apache-2.0
 
 import argparse
+import contextlib
+import contextvars
 import dataclasses
 import io
+import json
 import os
 import re
+import threading
 import time
 from collections.abc import Generator
 from dataclasses import dataclass
 from functools import partial
-from typing import BinaryIO, Optional, Union
+from typing import Any, BinaryIO, Optional, Union
 
 import torch
 from torch import nn
+from torch.utils._python_dispatch import TorchDispatchMode
 from transformers import PretrainedConfig
 
 import vllm.envs as envs
 from vllm.config import ModelConfig, ParallelConfig, set_current_vllm_config
 from vllm.engine.arg_utils import EngineArgs
-from vllm.engine.llm_engine import LLMEngine
 from vllm.logger import init_logger
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     VocabParallelEmbedding)
@@ -58,9 +62,79 @@ __all__ = [
 logger = init_logger(__name__)
 
 
+class MetaTensorMode(TorchDispatchMode):
+
+    def __torch_dispatch__(self, func, types, args=(), kwargs=None):
+        kwargs = kwargs or {}
+
+        if func._schema.name == "aten::empty" and "device" not in kwargs:
+            kwargs["device"] = "meta"
+
+        return func(*args, **kwargs)
+
+
+def meta_tensor_mode(loading_code=None, ):
+
+    if loading_code is None:
+        return _NoInitOrTensorImpl.context_manager()
+    elif callable(loading_code):
+        with _NoInitOrTensorImpl.context_manager():
+            return loading_code()
+    else:
+        raise TypeError(
+            "expected a callable to evaluate,"
+            " or None if being used as a context manager;"
+            f' got an object of type "{type(loading_code).__name__}" instead.')
+
+
+class _NoInitOrTensorImpl:
+    _MODULES = (torch.nn.Linear, torch.nn.Embedding, torch.nn.LayerNorm)
+    _MODULE_ORIGINALS = tuple((m, m.reset_parameters) for m in _MODULES)
+
+    is_active = contextvars.ContextVar("_NoInitOrTensorImpl.is_active",
+                                       default=False)
+    _count_active: int = 0
+    _count_active_lock = threading.Lock()
+
+    @classmethod
+    @contextlib.contextmanager
+    def context_manager(cls):
+        if cls.is_active.get():
+            yield
+            return
+
+        with cls._count_active_lock:
+            cls._count_active += 1
+            if cls._count_active == 1:
+                for mod in cls._MODULES:
+                    mod.reset_parameters = cls._disable(mod.reset_parameters)
+
+        reset_token = cls.is_active.set(True)
+
+        try:
+            with MetaTensorMode():
+                yield
+        finally:
+            cls.is_active.reset(reset_token)
+            with cls._count_active_lock:
+                cls._count_active -= 1
+                if cls._count_active == 0:
+                    for mod, original in cls._MODULE_ORIGINALS:
+                        mod.reset_parameters = original
+
+    @staticmethod
+    def _disable(func):
+
+        def wrapper(*args, **kwargs):
+            if not _NoInitOrTensorImpl.is_active.get():
+                return func(*args, **kwargs)
+
+        return wrapper
+
+
 @dataclass
 class TensorizerConfig:
-    tensorizer_uri: str
+    tensorizer_uri: Union[str, None] = None
     vllm_tensorized: Optional[bool] = False
     verify_hash: Optional[bool] = False
     num_readers: Optional[int] = None
@@ -71,12 +145,29 @@ class TensorizerConfig:
     model_class: Optional[type[torch.nn.Module]] = None
     hf_config: Optional[PretrainedConfig] = None
     dtype: Optional[Union[str, torch.dtype]] = None
+    lora_dir: Optional[str] = None
     _is_sharded: bool = False
 
     def __post_init__(self):
         # check if the configuration is for a sharded vLLM model
         self._is_sharded = isinstance(self.tensorizer_uri, str) \
             and re.search(r'%0\dd', self.tensorizer_uri) is not None
+        if not self.tensorizer_uri and not self.lora_dir:
+            raise ValueError("tensorizer_uri must be provided.")
+        if not self.tensorizer_uri and self.lora_dir:
+            self.tensorizer_uri = f"{self.lora_dir}/adapter_model.tensors"
+        assert self.tensorizer_uri is not None, ("tensorizer_uri must be "
+                                                 "provided.")
+        self.tensorizer_dir = os.path.dirname(self.tensorizer_uri)
+        self.lora_dir = self.tensorizer_dir
+
+    @classmethod
+    def as_dict(cls, *args, **kwargs) -> dict[str, Any]:
+        cfg = TensorizerConfig(*args, **kwargs)
+        return dataclasses.asdict(cfg)
+
+    def to_dict(self) -> dict[str, Any]:
+        return dataclasses.asdict(self)
 
     def _construct_tensorizer_args(self) -> "TensorizerArgs":
         tensorizer_args = {
@@ -140,7 +231,9 @@ class TensorizerArgs:
   
   Args:
       tensorizer_uri: Path to serialized model tensors. Can be a local file 
-          path or a S3 URI.
+          path or a S3 URI. This is a required field unless lora_dir is 
+          provided and the config is meant to be used for the
+          `tensorize_lora_adapter` function.
       vllm_tensorized: If True, indicates that the serialized model is a 
           vLLM model. This is used to determine the behavior of the 
           TensorDeserializer when loading tensors from a serialized model.
@@ -296,10 +389,10 @@ class TensorizerAgent:
         model_args.torch_dtype = self.tensorizer_config.dtype
         assert self.tensorizer_config.model_class is not None
         # TODO: Do we need to consider old-style model class?
-        with no_init_or_tensor(), set_current_vllm_config(self.vllm_config,
-                                                          check_compile=True):
+        with meta_tensor_mode(), set_current_vllm_config(self.vllm_config,
+                                                         check_compile=True):
             return self.tensorizer_config.model_class(
-                vllm_config=self.vllm_config, )
+                vllm_config=self.vllm_config)
 
     def _resize_lora_embeddings(self):
         """Modify LoRA embedding layers to use bigger tensors
@@ -467,8 +560,73 @@ def tensorize_vllm_model(engine_args: EngineArgs,
         ) as stream:
             stream.write(encryption_params.key)
 
-    engine = LLMEngine.from_engine_args(engine_args)
-    engine.model_executor.collective_rpc(
-        "save_tensorized_model",
-        kwargs=dict(tensorizer_config=tensorizer_config),
-    )
+    from vllm import LLMEngine
+    from vllm.v1.engine.llm_engine import LLMEngine as V1LLMEngine
+
+    if not envs.VLLM_USE_V1:
+        engine = LLMEngine.from_engine_args(engine_args)
+        engine.model_executor.collective_rpc(
+            "save_tensorized_model",
+            kwargs=dict(tensorizer_config=tensorizer_config),
+        )
+    else:
+        engine = V1LLMEngine.from_vllm_config(engine_config)
+        engine.collective_rpc(
+            "save_tensorized_model",
+            kwargs=dict(tensorizer_config=tensorizer_config),
+        )
+
+
+def tensorize_lora_adapter(lora_path: str,
+                           tensorizer_config: TensorizerConfig):
+    """
+    Uses tensorizer to serialize a LoRA adapter. Assumes that the files
+    needed to load a LoRA adapter are a safetensors-format file called
+    adapter_model.safetensors and a json config file called adapter_config.json.
+
+    Serializes the files in the tensorizer_config.lora_dir
+    """
+    import safetensors
+
+    from vllm.lora.utils import get_adapter_absolute_path
+
+    lora_dir = get_adapter_absolute_path(lora_path)
+
+    tensor_path = config_path = ""
+
+    for file in os.listdir(lora_dir):
+        if file.startswith("adapter_model"):
+            tensor_path = lora_dir + "/" + file
+        if file.startswith("adapter_config"):
+            config_path = lora_dir + "/" + file
+        if tensor_path and config_path:
+            break
+
+    if tensor_path.endswith(".safetensors"):
+        tensors = safetensors.torch.load_file(tensor_path)
+    elif tensor_path.endswith(".bin"):
+        tensors = torch.load(tensor_path)
+    else:
+        raise ValueError("Unsupported file: %s", tensor_path)
+
+    with open(config_path) as f:
+        config = json.load(f)
+
+    tensorizer_args = tensorizer_config._construct_tensorizer_args()
+
+    with open_stream(f"{tensorizer_config.lora_dir}/adapter_config.json",
+                     mode="wb+",
+                     **tensorizer_args.stream_params) as f:
+
+        f.write(json.dumps(config).encode("utf-8"))
+
+    lora_uri = (f"{tensorizer_config.lora_dir}"
+                f"/adapter_model.tensors")
+    with open_stream(lora_uri, mode="wb+",
+                     **tensorizer_args.stream_params) as f:
+        serializer = TensorSerializer(f)
+        serializer.write_state_dict(tensors)
+        serializer.close()
+
+    logger.info("Successfully serialized LoRA files to %s",
+                str(tensorizer_config.lora_dir))

vllm/model_executor/model_loader/tensorizer_loader.py

@@ -2,6 +2,7 @@
 # ruff: noqa: SIM117
 import copy
 from collections.abc import Generator
+from typing import Union
 
 import torch
 from torch import nn
@@ -111,8 +112,10 @@ class TensorizerLoader(BaseModelLoader):
     @staticmethod
     def save_model(
         model: torch.nn.Module,
-        tensorizer_config: TensorizerConfig,
+        tensorizer_config: Union[TensorizerConfig, dict],
     ) -> None:
+        if isinstance(tensorizer_config, dict):
+            tensorizer_config = TensorizerConfig(**tensorizer_config)
         serialize_vllm_model(
             model=model,
             tensorizer_config=tensorizer_config,

vllm/v1/engine/core.py

@@ -340,6 +340,13 @@ class EngineCore:
         return self.model_executor.collective_rpc(method, timeout, args,
                                                   kwargs)
 
+    def save_tensorized_model(
+        self,
+        tensorizer_config,
+    ) -> None:
+        self.model_executor.save_tensorized_model(
+            tensorizer_config=tensorizer_config, )
+
 
 class EngineCoreProc(EngineCore):
     """ZMQ-wrapper for running EngineCore in background process."""

vllm/v1/worker/gpu_model_runner.py

@@ -25,7 +25,7 @@ from vllm.distributed.parallel_state import (
 from vllm.forward_context import get_forward_context, set_forward_context
 from vllm.logger import init_logger
 from vllm.model_executor.layers.rotary_embedding import MRotaryEmbedding
-from vllm.model_executor.model_loader import get_model
+from vllm.model_executor.model_loader import TensorizerLoader, get_model
 from vllm.multimodal import MULTIMODAL_REGISTRY
 from vllm.multimodal.inputs import MultiModalKwargs, PlaceholderRange
 from vllm.multimodal.utils import group_mm_inputs_by_modality
@@ -60,6 +60,7 @@ from .utils import (gather_mm_placeholders, sanity_check_mm_encoder_outputs,
 if TYPE_CHECKING:
     import xgrammar as xgr
 
+    from vllm.model_executor.model_loader.tensorizer import TensorizerConfig
     from vllm.v1.core.sched.output import SchedulerOutput
 else:
     xgr = LazyLoader("xgr", globals(), "xgrammar")
@@ -1534,6 +1535,15 @@ class GPUModelRunner(LoRAModelRunnerMixin):
                     time_after_load - time_before_load)
         prepare_communication_buffer_for_model(self.model)
 
+    def save_tensorized_model(
+        self,
+        tensorizer_config: "TensorizerConfig",
+    ) -> None:
+        TensorizerLoader.save_model(
+            self.model,
+            tensorizer_config=tensorizer_config,
+        )
+
     def _get_prompt_logprobs_dict(
         self,
         hidden_states: torch.Tensor,

vllm/v1/worker/gpu_worker.py

@@ -31,6 +31,7 @@ from vllm.v1.worker.worker_base import WorkerBase
 logger = init_logger(__name__)
 
 if TYPE_CHECKING:
+    from vllm.model_executor.model_loader.tensorizer import TensorizerConfig
     from vllm.v1.core.sched.output import SchedulerOutput
 
 
@@ -326,6 +327,13 @@ class Worker(WorkerBase):
             max_size=max_size,
         )
 
+    def save_tensorized_model(
+        self,
+        tensorizer_config: "TensorizerConfig",
+    ) -> None:
+        self.model_runner.save_tensorized_model(
+            tensorizer_config=tensorizer_config, )
+
 
 def init_worker_distributed_environment(
     vllm_config: VllmConfig,