[Misc] Add SPDX-License-Identifier headers to python source files (#12628)

- **Add SPDX license headers to python source files**
- **Check for SPDX headers using pre-commit**

commit 9d7ef44c3cfb72ca4c32e1c677d99259d10d4745
Author: Russell Bryant <rbryant@redhat.com>
Date:   Fri Jan 31 14:18:24 2025 -0500

    Add SPDX license headers to python source files
    
This commit adds SPDX license headers to python source files as
recommended to
the project by the Linux Foundation. These headers provide a concise way
that is
both human and machine readable for communicating license information
for each
source file. It helps avoid any ambiguity about the license of the code
and can
    also be easily used by tools to help manage license compliance.
    
The Linux Foundation runs license scans against the codebase to help
ensure
    we are in compliance with the licenses of the code we use, including
dependencies. Having these headers in place helps that tool do its job.
    
    More information can be found on ...

vllm/model_executor/layers/rejection_sampler.py

+# SPDX-License-Identifier: Apache-2.0
+
 from functools import cached_property
 from importlib.util import find_spec
 from typing import Dict, Optional, Tuple

vllm/model_executor/layers/resampler.py

+# SPDX-License-Identifier: Apache-2.0
+
 # Adapted from
 # https://github.com/huggingface/transformers/blob/v4.28.0/src/transformers/models/llama/modeling_llama.py
 # https://huggingface.co/Qwen/Qwen-7B/blob/main/modeling_qwen.py

vllm/model_executor/layers/rotary_embedding.py

+# SPDX-License-Identifier: Apache-2.0
+
 # Adapted from
 # https://github.com/huggingface/transformers/blob/v4.33.2/src/transformers/models/llama/modeling_llama.py
 # Copyright 2023 The vLLM team.

vllm/model_executor/layers/sampler.py

+# SPDX-License-Identifier: Apache-2.0
 """A layer that samples the next tokens from the model's outputs."""
 import itertools
 import warnings

vllm/model_executor/layers/spec_decode_base_sampler.py

+# SPDX-License-Identifier: Apache-2.0
+
 from abc import abstractmethod
 from typing import Dict, Optional, Union
 

vllm/model_executor/layers/typical_acceptance_sampler.py

+# SPDX-License-Identifier: Apache-2.0
+
 import torch
 import torch.jit
 

vllm/model_executor/layers/utils.py

+# SPDX-License-Identifier: Apache-2.0
 """Utility methods for model layers."""
 from typing import Tuple
 

vllm/model_executor/layers/vocab_parallel_embedding.py

+# SPDX-License-Identifier: Apache-2.0
+
 from dataclasses import dataclass
 from typing import List, Optional, Sequence, Tuple
 

vllm/model_executor/model_loader/__init__.py

+# SPDX-License-Identifier: Apache-2.0
+
 from torch import nn
 
 from vllm.config import VllmConfig

vllm/model_executor/model_loader/loader.py

+# SPDX-License-Identifier: Apache-2.0
+
 # ruff: noqa: SIM117
 import collections
 import copy

vllm/model_executor/model_loader/neuron.py

+# SPDX-License-Identifier: Apache-2.0
 """Utilities for selecting and loading neuron models."""
 import copy
 import importlib

vllm/model_executor/model_loader/openvino.py

+# SPDX-License-Identifier: Apache-2.0
+
 # ruff: noqa: SIM117
 from pathlib import Path
 from typing import List, Optional, Tuple

vllm/model_executor/model_loader/tensorizer.py

+# SPDX-License-Identifier: Apache-2.0
+
 import argparse
 import dataclasses
 import io

vllm/model_executor/model_loader/utils.py

+# SPDX-License-Identifier: Apache-2.0
 """Utilities for selecting and loading models."""
 import contextlib
 from dataclasses import dataclass, field

vllm/model_executor/model_loader/weight_utils.py

+# SPDX-License-Identifier: Apache-2.0
 """Utilities for downloading and initializing model weights."""
 import fnmatch
 import glob

vllm/model_executor/models/__init__.py

+# SPDX-License-Identifier: Apache-2.0
+
 from .interfaces import (HasInnerState, SupportsLoRA, SupportsMultiModal,
                          SupportsPP, has_inner_state, supports_lora,
                          supports_multimodal, supports_pp)

vllm/model_executor/models/adapters.py

+# SPDX-License-Identifier: Apache-2.0
+
 from collections.abc import Iterable
 from typing import TYPE_CHECKING, Any, Optional, TypeVar
 

vllm/model_executor/models/arctic.py

+# SPDX-License-Identifier: Apache-2.0
 """Inference-only Snowflake Arctic model."""
 from typing import Iterable, List, Optional, Set, Tuple, Union
 

vllm/model_executor/models/aria.py

+# SPDX-License-Identifier: Apache-2.0
+
 from typing import (Iterable, List, Mapping, Optional, Set, Tuple, TypedDict,
                     Union)
 

vllm/model_executor/models/baichuan.py

+# SPDX-License-Identifier: Apache-2.0
+
 # Copyright 2022 EleutherAI and the HuggingFace Inc. team. All rights reserved.
 #
 # This code is based on EleutherAI's GPT-NeoX library and the GPT-NeoX