conftest.py

# SPDX-License-Identifier: Apache-2.0

import json
import os
import tempfile
from collections import UserList
from enum import Enum
from typing import Any, Callable, Optional, TypedDict, TypeVar, Union

import numpy as np
import pytest
import torch
import torch.nn as nn
import torch.nn.functional as F
from huggingface_hub import snapshot_download
from PIL import Image
from transformers import (AutoConfig, AutoModelForCausalLM, AutoTokenizer,
                          BatchEncoding, BatchFeature)
from transformers.models.auto.auto_factory import _BaseAutoModelClass

from tests.models.utils import (TokensTextLogprobs,
                                TokensTextLogprobsPromptLogprobs)
from vllm import LLM, SamplingParams
from vllm.assets.image import ImageAsset
from vllm.assets.video import VideoAsset
from vllm.config import TaskOption, _get_and_verify_dtype
from vllm.connections import global_http_connection
from vllm.distributed import (cleanup_dist_env_and_memory,
                              init_distributed_environment,
                              initialize_model_parallel)
from vllm.inputs import (ExplicitEncoderDecoderPrompt, TextPrompt,
                         to_enc_dec_tuple_list, zip_enc_dec_prompts)
from vllm.logger import init_logger
from vllm.outputs import RequestOutput
from vllm.sampling_params import BeamSearchParams
from vllm.utils import cuda_device_count_stateless

logger = init_logger(__name__)

_TEST_DIR = os.path.dirname(__file__)
_TEST_PROMPTS = [os.path.join(_TEST_DIR, "prompts", "example.txt")]
_LONG_PROMPTS = [os.path.join(_TEST_DIR, "prompts", "summary.txt")]
_SYS_MSG = os.path.join(_TEST_DIR, "system_messages", "sonnet3.5_nov2024.txt")

_M = TypeVar("_M")

_PromptMultiModalInput = Union[list[_M], list[list[_M]]]

PromptImageInput = _PromptMultiModalInput[Image.Image]
PromptAudioInput = _PromptMultiModalInput[tuple[np.ndarray, int]]
PromptVideoInput = _PromptMultiModalInput[np.ndarray]


def _read_prompts(filename: str) -> list[str]:
    with open(filename) as f:
        prompts = f.readlines()
        return prompts


class _ImageAssetPrompts(TypedDict):
    stop_sign: str
    cherry_blossom: str


class _ImageAssetsBase(UserList[ImageAsset]):
    pass


class _ImageAssets(_ImageAssetsBase):

    def __init__(self) -> None:
        super().__init__([
            ImageAsset("stop_sign"),
            ImageAsset("cherry_blossom"),
        ])

    def prompts(self, prompts: _ImageAssetPrompts) -> list[str]:
        """
        Convenience method to define the prompt for each test image.

        The order of the returned prompts matches the order of the
        assets when iterating through this object.
        """
        return [prompts["stop_sign"], prompts["cherry_blossom"]]


class _VideoAssetPrompts(TypedDict):
    sample_demo_1: str


class _VideoAssetsBase(UserList[VideoAsset]):
    pass


class _VideoAssets(_VideoAssetsBase):

    def __init__(self) -> None:
        super().__init__([
            VideoAsset("sample_demo_1.mp4"),
        ])

    def prompts(self, prompts: _VideoAssetPrompts) -> list[str]:
        return [prompts["sample_demo_1"]]


IMAGE_ASSETS = _ImageAssets()
"""Singleton instance of :class:`_ImageAssets`."""
VIDEO_ASSETS = _VideoAssets()
"""Singleton instance of :class:`_VideoAssets`."""


@pytest.fixture(scope="function", autouse=True)
def cleanup_VLLM_USE_V1(monkeypatch):
    """
    The V1 oracle sets "VLLM_USE_V1" during loading. This means
    that each invocation of a test change the env variable.

    If we touch "VLLM_USE_V1" with monkeypatch, then any changes
    made during the test run by vLLM will be cleaned up.

    This fixture is used by every test.
    """

    # If VLLM_USE_V1 is not set, set then delete. This will
    # cause monkeypatch to clean up VLLM_USE_V1 upon exit
    # if VLLM modifies the value of envs.VLLM_USE_V1.
    if "VLLM_USE_V1" not in os.environ:
        monkeypatch.setenv("VLLM_USE_V1", "")
        monkeypatch.delenv("VLLM_USE_V1")


@pytest.fixture(params=[True, False])
def run_with_both_engines(request, monkeypatch):
    # Automatically runs tests twice, once with V1 and once without
    use_v1 = request.param
    # Tests decorated with `@skip_v1` are only run without v1
    skip_v1 = request.node.get_closest_marker("skip_v1")

    if use_v1:
        if skip_v1:
            pytest.skip("Skipping test on vllm V1")
        monkeypatch.setenv('VLLM_USE_V1', '1')
    else:
        monkeypatch.setenv('VLLM_USE_V1', '0')

    yield


@pytest.fixture(autouse=True)
def init_test_http_connection():
    # pytest_asyncio may use a different event loop per test
    # so we need to make sure the async client is created anew
    global_http_connection.reuse_client = False


@pytest.fixture
def dist_init():
    temp_file = tempfile.mkstemp()[1]
    init_distributed_environment(
        world_size=1,
        rank=0,
        distributed_init_method=f"file://{temp_file}",
        local_rank=0,
        backend="nccl",
    )
    initialize_model_parallel(1, 1)
    yield
    cleanup_dist_env_and_memory()


@pytest.fixture()
def should_do_global_cleanup_after_test(request) -> bool:
    """Allow subdirectories to skip global cleanup by overriding this fixture.
    This can provide a ~10x speedup for non-GPU unit tests since they don't need
    to initialize torch.
    """

    return not request.node.get_closest_marker("skip_global_cleanup")


@pytest.fixture(autouse=True)
def cleanup_fixture(should_do_global_cleanup_after_test: bool):
    yield
    if should_do_global_cleanup_after_test:
        cleanup_dist_env_and_memory()


@pytest.fixture(autouse=True)
def dynamo_reset():
    yield
    torch._dynamo.reset()


@pytest.fixture
def example_prompts() -> list[str]:
    prompts = []
    for filename in _TEST_PROMPTS:
        prompts += _read_prompts(filename)
    return prompts


@pytest.fixture
def example_system_message() -> str:
    with open(_SYS_MSG) as f:
        return f.read()


class DecoderPromptType(Enum):
    """For encoder/decoder models only."""
    CUSTOM = 1
    NONE = 2
    EMPTY_STR = 3


@pytest.fixture
def example_encoder_decoder_prompts(
) -> dict[DecoderPromptType, list[ExplicitEncoderDecoderPrompt]]:
    '''
    Returns an encoder prompt list and a decoder prompt list, wherein each pair
    of same-index entries in both lists corresponds to an (encoder prompt,
    decoder prompt) tuple.

    Returns:

    * Encoder prompt list
    * Decoder prompt list (reverse of encoder prompt list)
    '''

    encoder_prompts = []
    for filename in _TEST_PROMPTS:
        encoder_prompts += _read_prompts(filename)

    custom_decoder_prompts = encoder_prompts[::-1]
    empty_str_decoder_prompts = [""] * len(encoder_prompts)
    none_decoder_prompts = [None] * len(encoder_prompts)

    # NONE decoder prompt type
    return {
        DecoderPromptType.NONE:
        zip_enc_dec_prompts(encoder_prompts, none_decoder_prompts),
        DecoderPromptType.EMPTY_STR:
        zip_enc_dec_prompts(encoder_prompts, empty_str_decoder_prompts),
        DecoderPromptType.CUSTOM:
        zip_enc_dec_prompts(encoder_prompts, custom_decoder_prompts),
    }


@pytest.fixture
def example_long_prompts() -> list[str]:
    prompts = []
    for filename in _LONG_PROMPTS:
        prompts += _read_prompts(filename)
    return prompts


@pytest.fixture(scope="session")
def image_assets() -> _ImageAssets:
    return IMAGE_ASSETS


@pytest.fixture(scope="session")
def video_assets() -> _VideoAssets:
    return VIDEO_ASSETS


_T = TypeVar("_T", nn.Module, torch.Tensor, BatchEncoding, BatchFeature, dict)
_R = TypeVar("_R")


class HfRunner:

    def get_default_device(self):
        from vllm.platforms import current_platform

        return ("cpu" if current_platform.is_cpu() else "cuda")

    def wrap_device(self, x: _T, device: Optional[str] = None) -> _T:
        if x is None or isinstance(x, (bool, )):
            return x

        if device is None:
            device = self.device

        if isinstance(x, dict):
            return {k: self.wrap_device(v, device) for k, v in x.items()}

        if hasattr(x, "device") and x.device.type == device:
            return x

        return x.to(device)

    def __init__(
        self,
        model_name: str,
        dtype: str = "auto",
        *,
        model_kwargs: Optional[dict[str, Any]] = None,
        is_sentence_transformer: bool = False,
        is_cross_encoder: bool = False,
        skip_tokenizer_init: bool = False,
        auto_cls: type[_BaseAutoModelClass] = AutoModelForCausalLM,
    ) -> None:
        self.model_name = model_name

        self.config = AutoConfig.from_pretrained(
            model_name,
            trust_remote_code=True,
        )
        self.device = self.get_default_device()
        self.dtype = torch_dtype = _get_and_verify_dtype(self.config, dtype)

        model_kwargs = model_kwargs if model_kwargs is not None else {}
        model_kwargs.setdefault("torch_dtype", torch_dtype)

        if is_sentence_transformer:
            # Lazy init required for AMD CI
            from sentence_transformers import SentenceTransformer

            self.model = SentenceTransformer(
                model_name,
                device=self.device,
                model_kwargs=model_kwargs,
                trust_remote_code=True,
            )
        elif is_cross_encoder:
            # Lazy init required for AMD CI
            from sentence_transformers import CrossEncoder

            self.model = CrossEncoder(
                model_name,
                device=self.device,
                automodel_args=model_kwargs,
                trust_remote_code=True,
            )
        else:
            model = auto_cls.from_pretrained(
                model_name,
                trust_remote_code=True,
                **model_kwargs,
            )

            if (getattr(model, "quantization_method", None) != "bitsandbytes"
                    and len({p.device
                             for p in model.parameters()}) < 2):
                model = model.to(self.device)

            self.model = model

        if not skip_tokenizer_init:
            self.tokenizer = AutoTokenizer.from_pretrained(
                model_name,
                torch_dtype=torch_dtype,
                trust_remote_code=True,
            )

        # don't put this import at the top level
        # it will call torch.cuda.device_count()
        from transformers import AutoProcessor  # noqa: F401
        self.processor = AutoProcessor.from_pretrained(
            model_name,
            torch_dtype=torch_dtype,
            trust_remote_code=True,
        )
        if skip_tokenizer_init:
            self.tokenizer = self.processor.tokenizer

    def get_inputs(
        self,
        prompts: list[str],
        images: Optional[PromptImageInput] = None,
        videos: Optional[PromptVideoInput] = None,
        audios: Optional[PromptAudioInput] = None,
    ) -> list[Union[BatchFeature, BatchEncoding]]:
        if images is not None:
            assert len(prompts) == len(images)

        if videos is not None:
            assert len(prompts) == len(videos)

        if audios is not None:
            assert len(prompts) == len(audios)

        all_inputs: list[Union[BatchFeature, BatchEncoding]] = []
        for i, prompt in enumerate(prompts):
            processor_kwargs: dict[str, Any] = {
                "text": prompt,
                "return_tensors": "pt",
            }
            if images is not None and (image := images[i]) is not None:
                processor_kwargs["images"] = image
            if videos is not None and (video := videos[i]) is not None:
                processor_kwargs["videos"] = video
            if audios is not None and (audio_tuple := audios[i]) is not None:
                audio, sr = audio_tuple
                processor_kwargs["audio"] = audio
                processor_kwargs["sampling_rate"] = sr

            inputs = self.processor(**processor_kwargs)
            if isinstance(inputs, BatchFeature):
                inputs = inputs.to(dtype=self.dtype)

            all_inputs.append(inputs)

        return all_inputs

    def classify(self, prompts: list[str]) -> list[str]:
        # output is final logits
        all_inputs = self.get_inputs(prompts)
        outputs = []
        for inputs in all_inputs:
            output = self.model(**self.wrap_device(inputs))
            logits = output.logits.softmax(dim=-1)[0].tolist()
            outputs.append(logits)

        return outputs

    def generate(
        self,
        prompts: list[str],
        images: Optional[PromptImageInput] = None,
        videos: Optional[PromptVideoInput] = None,
        audios: Optional[PromptAudioInput] = None,
        **kwargs: Any,
    ) -> list[tuple[list[list[int]], list[str]]]:
        all_inputs = self.get_inputs(prompts,
                                     images=images,
                                     videos=videos,
                                     audios=audios)

        outputs: list[tuple[list[list[int]], list[str]]] = []
        for inputs in all_inputs:
            output_ids = self.model.generate(
                **self.wrap_device(inputs),
                use_cache=True,
                **kwargs,
            )
            output_str = self.processor.batch_decode(
                output_ids,
                skip_special_tokens=True,
                clean_up_tokenization_spaces=False,
            )
            output_ids = output_ids.cpu().tolist()
            outputs.append((output_ids, output_str))
        return outputs

    def generate_greedy(
        self,
        prompts: list[str],
        max_tokens: int,
        images: Optional[PromptImageInput] = None,
        videos: Optional[PromptVideoInput] = None,
        audios: Optional[PromptAudioInput] = None,
        **kwargs: Any,
    ) -> list[tuple[list[int], str]]:
        outputs = self.generate(prompts,
                                do_sample=False,
                                max_new_tokens=max_tokens,
                                images=images,
                                videos=videos,
                                audios=audios,
                                **kwargs)

        return [(output_ids[0], output_str[0])
                for output_ids, output_str in outputs]

    def generate_beam_search(
        self,
        prompts: list[str],
        beam_width: int,
        max_tokens: int,
        images: Optional[PromptImageInput] = None,
        videos: Optional[PromptVideoInput] = None,
        audios: Optional[PromptAudioInput] = None,
    ) -> list[tuple[list[list[int]], list[str]]]:
        outputs = self.generate(prompts,
                                do_sample=False,
                                max_new_tokens=max_tokens,
                                num_beams=beam_width,
                                num_return_sequences=beam_width,
                                images=images,
                                videos=videos,
                                audios=audios)

        for i in range(len(outputs)):
            output_ids, output_str = outputs[i]
            for j in range(len(output_ids)):
                output_ids[j] = [
                    x for x in output_ids[j]
                    if x != self.tokenizer.pad_token_id
                ]
            outputs[i] = (output_ids, output_str)
        return outputs

    def generate_greedy_logprobs(
        self,
        prompts: list[str],
        max_tokens: int,
        images: Optional[PromptImageInput] = None,
        videos: Optional[PromptVideoInput] = None,
        audios: Optional[PromptAudioInput] = None,
        **kwargs: Any,
    ) -> list[list[torch.Tensor]]:
        all_inputs = self.get_inputs(prompts,
                                     images=images,
                                     videos=videos,
                                     audios=audios)

        all_logprobs: list[list[torch.Tensor]] = []
        for inputs in all_inputs:
            output = self.model.generate(
                **self.wrap_device(inputs),
                use_cache=True,
                do_sample=False,
                max_new_tokens=max_tokens,
                output_hidden_states=True,
                return_dict_in_generate=True,
                **kwargs,
            )
            seq_logprobs = self._hidden_states_to_seq_logprobs(
                output.hidden_states)
            all_logprobs.append(seq_logprobs)
        return all_logprobs

    def _hidden_states_to_seq_logprobs(
        self,
        hidden_states: tuple[tuple[torch.Tensor, ...], ...],
    ) -> list[torch.Tensor]:
        output_embeddings = self.model.get_output_embeddings()

        seq_logprobs: list[torch.Tensor] = []
        for _, hidden_state in enumerate(hidden_states):
            last_hidden_states = hidden_state[-1][0]
            logits = torch.matmul(
                last_hidden_states.to(
                    device=output_embeddings.weight.device,
                    dtype=output_embeddings.weight.dtype,
                ),
                output_embeddings.weight.t(),
            )
            if getattr(output_embeddings, "bias", None) is not None:
                logits += output_embeddings.bias.unsqueeze(0)
            logprobs = F.log_softmax(logits, dim=-1, dtype=torch.float32)
            seq_logprobs.append(logprobs)

        return seq_logprobs

    def _hidden_states_to_logprobs(
        self,
        hidden_states: tuple[tuple[torch.Tensor, ...], ...],
        num_logprobs: int,
    ) -> tuple[list[dict[int, float]], int]:
        seq_logprobs = self._hidden_states_to_seq_logprobs(hidden_states)
        output_len = len(hidden_states)

        # convert to dict
        seq_logprobs_lst: list[dict[int, float]] = []
        for tok_idx, tok_logprobs in enumerate(seq_logprobs):
            # drop prompt logprobs
            if tok_idx == 0:
                tok_logprobs = tok_logprobs[-1, :].reshape(1, -1)
            topk = tok_logprobs.topk(num_logprobs)

            tok_logprobs_dct = {}
            for token_id, logprob in zip(topk.indices[0], topk.values[0]):
                tok_logprobs_dct[token_id.item()] = logprob.item()

            seq_logprobs_lst.append(tok_logprobs_dct)

        return (
            seq_logprobs_lst,
            output_len,
        )

    def generate_greedy_logprobs_limit(
        self,
        prompts: list[str],
        max_tokens: int,
        num_logprobs: int,
        images: Optional[PromptImageInput] = None,
        audios: Optional[PromptAudioInput] = None,
        videos: Optional[PromptVideoInput] = None,
        **kwargs: Any,
    ) -> list[TokensTextLogprobs]:
        all_inputs = self.get_inputs(prompts,
                                     images=images,
                                     videos=videos,
                                     audios=audios)

        all_logprobs: list[list[dict[int, float]]] = []
        all_output_ids: list[list[int]] = []
        all_output_strs: list[str] = []

        for inputs in all_inputs:
            output = self.model.generate(
                **self.wrap_device(inputs),
                use_cache=True,
                do_sample=False,
                max_new_tokens=max_tokens,
                output_hidden_states=True,
                return_dict_in_generate=True,
                **kwargs,
            )

            (
                seq_logprobs_lst,
                output_len,
            ) = self._hidden_states_to_logprobs(output.hidden_states,
                                                num_logprobs)

            all_logprobs.append(seq_logprobs_lst)
            seq_ids = output.sequences[0]
            output_len = len(seq_logprobs_lst)
            output_ids = seq_ids[-output_len:]
            all_output_ids.append(output_ids.tolist())
            all_output_strs.append(self.tokenizer.decode(output_ids))

        outputs = zip(all_output_ids, all_output_strs, all_logprobs)
        return [(output_ids, output_str, output_logprobs)
                for output_ids, output_str, output_logprobs in outputs]

    def generate_encoder_decoder_greedy_logprobs_limit(
        self,
        encoder_decoder_prompts: list[ExplicitEncoderDecoderPrompt[str, str]],
        max_tokens: int,
        num_logprobs: int,
        images: Optional[PromptImageInput] = None,
        **kwargs: Any,
    ) -> list[TokensTextLogprobs]:
        '''
        Greedy logprobs generation for vLLM encoder/decoder models
        '''

        all_logprobs: list[list[dict[int, float]]] = []
        all_output_ids: list[list[int]] = []
        all_output_strs: list[str] = []

        for i, (encoder_prompt, decoder_prompt) in enumerate(
                to_enc_dec_tuple_list(encoder_decoder_prompts)):
            processor_kwargs: dict[str, Any] = {
                "text": encoder_prompt,
                "return_tensors": "pt",
            }
            if images is not None and images[i] is not None:
                processor_kwargs["images"] = images[i]

            encoder_inputs = self.processor(**processor_kwargs)
            encoder_inputs = self.wrap_device(encoder_inputs)

            if decoder_prompt is None:
                decoder_input_ids = None
            else:
                decoder_inputs = self.tokenizer(decoder_prompt,
                                                return_tensors="pt")
                decoder_input_ids = self.wrap_device(decoder_inputs.input_ids)

            output = self.model.generate(
                decoder_input_ids=decoder_input_ids,
                use_cache=True,
                do_sample=False,
                max_new_tokens=max_tokens,
                output_hidden_states=True,
                return_dict_in_generate=True,
                **encoder_inputs,
                **kwargs,
            )

            (
                seq_logprobs_lst,
                output_len,
            ) = self._hidden_states_to_logprobs(output.decoder_hidden_states,
                                                num_logprobs)

            all_logprobs.append(seq_logprobs_lst)
            seq_ids = output.sequences[0]
            output_ids = seq_ids[-output_len:]
            all_output_ids.append(output_ids.tolist())
            all_output_strs.append(self.tokenizer.decode(output_ids))

        outputs = zip(all_output_ids, all_output_strs, all_logprobs)
        return [(output_ids, output_str, output_logprobs)
                for output_ids, output_str, output_logprobs in outputs]

    def encode(self, prompts: list[str], *args,
               **kwargs) -> list[list[torch.Tensor]]:
        return self.model.encode(prompts, *args, **kwargs)

    def predict(self, prompts: list[list[str]]) -> torch.Tensor:
        return self.model.predict(prompts, convert_to_tensor=True)

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_value, traceback):
        del self.model
        cleanup_dist_env_and_memory()


@pytest.fixture(scope="session")
def hf_runner():
    return HfRunner


class VllmRunner:
    """
    The default value of some arguments have been modified from
    :class:`~vllm.LLM` as follows:

    - `trust_remote_code`: Set to `True` instead of `False` for convenience.
    - `seed`: Set to `0` instead of `None` for test reproducibility.
    - `max_model_len`: Set to `1024` instead of `None` to reduce memory usage.
    - `block_size`: Set to `16` instead of `None` to reduce memory usage.
    - `enable_chunked_prefill`: Set to `False` instead of `None` for
      test reproducibility.
    - `enforce_eager`: Set to `False` instead of `None` to test CUDA graph.
    """

    def __init__(
        self,
        model_name: str,
        task: TaskOption = "auto",
        tokenizer_name: Optional[str] = None,
        tokenizer_mode: str = "auto",
        trust_remote_code: bool = True,
        seed: Optional[int] = 0,
        max_model_len: int = 1024,
        dtype: str = "auto",
        disable_log_stats: bool = True,
        tensor_parallel_size: int = 1,
        block_size: int = 16,
        enable_chunked_prefill: Optional[bool] = False,
        swap_space: int = 4,
        enforce_eager: Optional[bool] = False,
        **kwargs,
    ) -> None:
        self.model = LLM(
            model=model_name,
            task=task,
            tokenizer=tokenizer_name,
            tokenizer_mode=tokenizer_mode,
            trust_remote_code=trust_remote_code,
            dtype=dtype,
            seed=seed,
            swap_space=swap_space,
            enforce_eager=enforce_eager,
            disable_log_stats=disable_log_stats,
            tensor_parallel_size=tensor_parallel_size,
            max_model_len=max_model_len,
            block_size=block_size,
            enable_chunked_prefill=enable_chunked_prefill,
            **kwargs,
        )

    def get_inputs(
        self,
        prompts: list[str],
        images: Optional[PromptImageInput] = None,
        videos: Optional[PromptVideoInput] = None,
        audios: Optional[PromptAudioInput] = None,
    ) -> list[TextPrompt]:

        if any(x is not None and len(x) != len(prompts)
               for x in [images, videos, audios]):
            raise ValueError(
                "All non-None multimodal inputs must have the same length as "
                "prompts")

        inputs = []
        for i, prompt in enumerate(prompts):
            multi_modal_data = {}
            if images is not None and (image := images[i]) is not None:
                multi_modal_data["image"] = image
            if videos is not None and (video := videos[i]) is not None:
                multi_modal_data["video"] = video
            if audios is not None and (audio := audios[i]) is not None:
                multi_modal_data["audio"] = audio

            inputs.append(
                TextPrompt(prompt=prompt,
                           multi_modal_data=multi_modal_data
                           if multi_modal_data else None))

        return inputs

    def generate(
        self,
        prompts: list[str],
        sampling_params: SamplingParams,
        images: Optional[PromptImageInput] = None,
        videos: Optional[PromptVideoInput] = None,
        audios: Optional[PromptAudioInput] = None,
        **kwargs: Any,
    ) -> list[tuple[list[list[int]], list[str]]]:
        inputs = self.get_inputs(prompts,
                                 images=images,
                                 videos=videos,
                                 audios=audios)

        req_outputs = self.model.generate(inputs,
                                          sampling_params=sampling_params,
                                          **kwargs)

        outputs: list[tuple[list[list[int]], list[str]]] = []
        for req_output in req_outputs:
            prompt_str = req_output.prompt
            prompt_ids = req_output.prompt_token_ids
            req_sample_output_ids: list[list[int]] = []
            req_sample_output_strs: list[str] = []
            for sample in req_output.outputs:
                output_str = sample.text
                output_ids = list(sample.token_ids)
                req_sample_output_ids.append(prompt_ids + output_ids)
                req_sample_output_strs.append(prompt_str + output_str)
            outputs.append((req_sample_output_ids, req_sample_output_strs))
        return outputs

    @staticmethod
    def _final_steps_generate_w_logprobs(
        req_outputs: list[RequestOutput],
    ) -> list[TokensTextLogprobsPromptLogprobs]:
        outputs: list[TokensTextLogprobsPromptLogprobs] = []
        for req_output in req_outputs:
            assert len(req_output.outputs) > 0
            for sample in req_output.outputs:
                output_str = sample.text
                output_ids = list(sample.token_ids)
                output_logprobs = sample.logprobs
            outputs.append((output_ids, output_str, output_logprobs,
                            req_output.prompt_logprobs))
        return outputs

    def generate_w_logprobs(
        self,
        prompts: list[str],
        sampling_params: SamplingParams,
        images: Optional[PromptImageInput] = None,
        audios: Optional[PromptAudioInput] = None,
        videos: Optional[PromptVideoInput] = None,
        **kwargs: Any,
    ) -> Union[list[TokensTextLogprobs],
               list[TokensTextLogprobsPromptLogprobs]]:
        inputs = self.get_inputs(prompts,
                                 images=images,
                                 videos=videos,
                                 audios=audios)

        req_outputs = self.model.generate(inputs,
                                          sampling_params=sampling_params,
                                          **kwargs)

        toks_str_logsprobs_prompt_logprobs = (
            self._final_steps_generate_w_logprobs(req_outputs))
        # Omit prompt logprobs if not required by sampling params
        return ([x[0:-1] for x in toks_str_logsprobs_prompt_logprobs]
                if sampling_params.prompt_logprobs is None else
                toks_str_logsprobs_prompt_logprobs)

    def generate_encoder_decoder_w_logprobs(
        self,
        encoder_decoder_prompts: list[ExplicitEncoderDecoderPrompt[str, str]],
        sampling_params: SamplingParams,
    ) -> Union[list[TokensTextLogprobs],
               list[TokensTextLogprobsPromptLogprobs]]:
        '''
        Logprobs generation for vLLM encoder/decoder models
        '''

        assert sampling_params.logprobs is not None
        req_outputs = self.model.generate(encoder_decoder_prompts,
                                          sampling_params=sampling_params)
        toks_str_logsprobs_prompt_logprobs = (
            self._final_steps_generate_w_logprobs(req_outputs))
        # Omit prompt logprobs if not required by sampling params
        return ([x[0:-1] for x in toks_str_logsprobs_prompt_logprobs]
                if sampling_params.prompt_logprobs is None else
                toks_str_logsprobs_prompt_logprobs)

    def generate_greedy(
        self,
        prompts: list[str],
        max_tokens: int,
        images: Optional[PromptImageInput] = None,
        videos: Optional[PromptVideoInput] = None,
        audios: Optional[PromptAudioInput] = None,
        **kwargs: Any,
    ) -> list[tuple[list[int], str]]:
        greedy_params = SamplingParams(temperature=0.0, max_tokens=max_tokens)
        outputs = self.generate(prompts,
                                greedy_params,
                                images=images,
                                videos=videos,
                                audios=audios,
                                **kwargs)
        return [(output_ids[0], output_str[0])
                for output_ids, output_str in outputs]

    def generate_greedy_logprobs(
        self,
        prompts: list[str],
        max_tokens: int,
        num_logprobs: int,
        num_prompt_logprobs: Optional[int] = None,
        images: Optional[PromptImageInput] = None,
        audios: Optional[PromptAudioInput] = None,
        videos: Optional[PromptVideoInput] = None,
        stop_token_ids: Optional[list[int]] = None,
        stop: Optional[list[str]] = None,
        **kwargs: Any,
    ) -> Union[list[TokensTextLogprobs],
               list[TokensTextLogprobsPromptLogprobs]]:
        greedy_logprobs_params = SamplingParams(
            temperature=0.0,
            max_tokens=max_tokens,
            logprobs=num_logprobs,
            prompt_logprobs=num_prompt_logprobs,
            stop_token_ids=stop_token_ids,
            stop=stop)

        return self.generate_w_logprobs(prompts,
                                        greedy_logprobs_params,
                                        images=images,
                                        audios=audios,
                                        videos=videos,
                                        **kwargs)

    def generate_encoder_decoder_greedy_logprobs(
        self,
        encoder_decoder_prompts: list[ExplicitEncoderDecoderPrompt[str, str]],
        max_tokens: int,
        num_logprobs: int,
        num_prompt_logprobs: Optional[int] = None,
        skip_special_tokens: bool = True,
    ) -> Union[list[TokensTextLogprobs],
               list[TokensTextLogprobsPromptLogprobs]]:
        greedy_logprobs_params = SamplingParams(
            temperature=0.0,
            max_tokens=max_tokens,
            logprobs=num_logprobs,
            prompt_logprobs=(num_prompt_logprobs),
            skip_special_tokens=skip_special_tokens,
        )
        '''
        Greedy logprobs generation for vLLM encoder/decoder models
        '''

        return self.generate_encoder_decoder_w_logprobs(
            encoder_decoder_prompts, greedy_logprobs_params)

    def generate_beam_search(
        self,
        prompts: list[str],
        beam_width: int,
        max_tokens: int,
        images: Optional[PromptImageInput] = None,
        videos: Optional[PromptVideoInput] = None,
        audios: Optional[PromptAudioInput] = None,
    ) -> list[tuple[list[list[int]], list[str]]]:
        inputs = self.get_inputs(prompts,
                                 images=images,
                                 videos=videos,
                                 audios=audios)

        outputs = self.model.beam_search(
            inputs,
            BeamSearchParams(beam_width=beam_width, max_tokens=max_tokens))
        returned_outputs = []
        for output in outputs:
            token_ids = [x.tokens for x in output.sequences]
            texts = [x.text for x in output.sequences]
            returned_outputs.append((token_ids, texts))
        return returned_outputs

    def classify(self, prompts: list[str]) -> list[list[float]]:
        req_outputs = self.model.classify(prompts)
        return [req_output.outputs.probs for req_output in req_outputs]

    def encode(self,
               prompts: list[str],
               images: Optional[PromptImageInput] = None,
               videos: Optional[PromptVideoInput] = None,
               audios: Optional[PromptAudioInput] = None,
               *args,
               **kwargs) -> list[list[float]]:
        inputs = self.get_inputs(prompts,
                                 images=images,
                                 videos=videos,
                                 audios=audios)

        req_outputs = self.model.embed(inputs, *args, **kwargs)
        return [req_output.outputs.embedding for req_output in req_outputs]

    def score(
        self,
        text_1: Union[str, list[str]],
        text_2: Union[str, list[str]],
    ) -> list[float]:
        req_outputs = self.model.score(text_1, text_2)
        return [req_output.outputs.score for req_output in req_outputs]

    def apply_model(self, func: Callable[[nn.Module], _R]) -> list[_R]:
        executor = self.model.llm_engine.model_executor
        return executor.apply_model(func)

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_value, traceback):
        del self.model
        cleanup_dist_env_and_memory()


@pytest.fixture(scope="session")
def vllm_runner():
    return VllmRunner


@pytest.fixture()
def temporary_enable_log_propagate():
    import logging
    logger = logging.getLogger("vllm")
    logger.propagate = True
    yield
    logger.propagate = False


@pytest.fixture()
def caplog_vllm(temporary_enable_log_propagate, caplog):
    # To capture vllm log, we should enable propagate=True temporarily
    # because caplog depends on logs propagated to the root logger.
    yield caplog


@pytest.fixture(scope="session")
def num_gpus_available():
    """Get number of GPUs without initializing the CUDA context
    in current process."""

    return cuda_device_count_stateless()


temp_dir = tempfile.gettempdir()
_dummy_opt_path = os.path.join(temp_dir, "dummy_opt")
_dummy_llava_path = os.path.join(temp_dir, "dummy_llava")
_dummy_gemma2_embedding_path = os.path.join(temp_dir, "dummy_gemma2_embedding")


@pytest.fixture
def dummy_opt_path():
    json_path = os.path.join(_dummy_opt_path, "config.json")
    if not os.path.exists(_dummy_opt_path):
        snapshot_download(repo_id="facebook/opt-125m",
                          local_dir=_dummy_opt_path,
                          ignore_patterns=[
                              "*.bin", "*.bin.index.json", "*.pt", "*.h5",
                              "*.msgpack"
                          ])
        assert os.path.exists(json_path)
        with open(json_path) as f:
            config = json.load(f)
        config["architectures"] = ["MyOPTForCausalLM"]
        with open(json_path, "w") as f:
            json.dump(config, f)
    return _dummy_opt_path


@pytest.fixture
def dummy_llava_path():
    json_path = os.path.join(_dummy_llava_path, "config.json")
    if not os.path.exists(_dummy_llava_path):
        snapshot_download(repo_id="llava-hf/llava-1.5-7b-hf",
                          local_dir=_dummy_llava_path,
                          ignore_patterns=[
                              "*.bin", "*.bin.index.json", "*.pt", "*.h5",
                              "*.msgpack"
                          ])
        assert os.path.exists(json_path)
        with open(json_path) as f:
            config = json.load(f)
        config["architectures"] = ["MyLlava"]
        with open(json_path, "w") as f:
            json.dump(config, f)
    return _dummy_llava_path


@pytest.fixture
def dummy_gemma2_embedding_path():
    json_path = os.path.join(_dummy_gemma2_embedding_path, "config.json")
    if not os.path.exists(_dummy_gemma2_embedding_path):
        snapshot_download(repo_id="BAAI/bge-multilingual-gemma2",
                          local_dir=_dummy_gemma2_embedding_path,
                          ignore_patterns=[
                              "*.bin", "*.bin.index.json", "*.pt", "*.h5",
                              "*.msgpack"
                          ])
        assert os.path.exists(json_path)
        with open(json_path) as f:
            config = json.load(f)
        config["architectures"] = ["MyGemma2Embedding"]
        with open(json_path, "w") as f:
            json.dump(config, f)
    return _dummy_gemma2_embedding_path


# Add the flag `--optional` to allow run tests
# that are marked with @pytest.mark.optional
def pytest_addoption(parser):
    parser.addoption("--optional",
                     action="store_true",
                     default=False,
                     help="run optional test")


def pytest_collection_modifyitems(config, items):
    if config.getoption("--optional"):
        # --optional given in cli: do not skip optional tests
        return
    skip_optional = pytest.mark.skip(reason="need --optional option to run")
    for item in items:
        if "optional" in item.keywords:
            item.add_marker(skip_optional)


@pytest.fixture(scope="session")
def cli_config_file():
    """Return the path to the CLI config file."""
    return os.path.join(_TEST_DIR, "config", "test_config.yaml")


@pytest.fixture(scope="session")
def cli_config_file_with_model():
    """Return the path to the CLI config file with model."""
    return os.path.join(_TEST_DIR, "config", "test_config_with_model.yaml")