vLLM 0.2.6 Endpoint | Serverless Worker

🚀 | This serverless worker utilizes vLLM behind the scenes and is integrated into RunPod's serverless environment. It supports dynamic auto-scaling using the built-in RunPod autoscaling feature.

Setting up the Serverless Worker

Option 1:Deploy Any Model Using Pre-Built Docker Image

We now offer a pre-built Docker Image for the vLLM Worker that you can configure entirely with Environment Variables when creating the RunPod Serverless Endpoint:

runpod/worker-vllm:dev

Environment Variables

• Required:

  • MODEL_NAME: Hugging Face Model Repository (e.g., openchat/openchat-3.5-1210).

• Optional:

  • MODEL_BASE_PATH: Model storage directory (default: /runpod-volume).
  • HF_TOKEN: Hugging Face token for private and gated models (e.g., Llama, Falcon).
  • NUM_GPU_SHARD: Number of GPUs to split the model across (default: 1).
  • QUANTIZATION: AWQ (awq) or SqueezeLLM (squeezellm) quantization.
  • MAX_CONCURRENCY: Max concurrent requests (default: 100).
  • DEFAULT_BATCH_SIZE: Token streaming batch size (default: 10). This reduces the number of HTTP calls, increasing speed 8-10x vs non-batching, matching non-streaming performance.
  • DISABLE_LOG_STATS: Enable (0) or disable (1) vLLM stats logging.
  • DISABLE_LOG_REQUESTS: Enable (0) or disable (1) request logging.

Option 2: Build Docker Image with Model Inside

To build an image with the model baked in, you must specify the following docker arguments when building the image:

• Required
  • MODEL_NAME
• Optional
  • MODEL_BASE_PATH: Defaults to /runpod-volume for network storage. Use /models or for local container storage.
  • QUANTIZATION
  • HF_TOKEN
  • WORKER_CUDA_VERSION: 11.8 or 12.1 (default: 11.8 due to a small amount of workers not having CUDA 12.1 support yet. 12.1 is recommended for optimal performance).

Example: Building an image with OpenChat-3.5

sudo docker build -t username/image:tag --build-arg MODEL_NAME="openchat/openchat_3.5" --build-arg MODEL_BASE_PATH="/models" .

Compatible Models

• LLaMA & LLaMA-2 (meta-llama/Llama-2-70b-hf, lmsys/vicuna-13b-v1.3, young-geng/koala, openlm-research/open_llama_13b, etc.)
• Mistral (mistralai/Mistral-7B-v0.1, mistralai/Mistral-7B-Instruct-v0.1, etc.)
• Mixtral (mistralai/Mixtral-8x7B-v0.1, mistralai/Mixtral-8x7B-Instruct-v0.1, etc.)
• Aquila & Aquila2 (BAAI/AquilaChat2-7B, BAAI/AquilaChat2-34B, BAAI/Aquila-7B, BAAI/AquilaChat-7B, etc.)
• Baichuan & Baichuan2 (baichuan-inc/Baichuan2-13B-Chat, baichuan-inc/Baichuan-7B, etc.)
• BLOOM (bigscience/bloom, bigscience/bloomz, etc.)
• ChatGLM (THUDM/chatglm2-6b, THUDM/chatglm3-6b, etc.)
• Falcon (tiiuae/falcon-7b, tiiuae/falcon-40b, tiiuae/falcon-rw-7b, etc.)
• GPT-2 (gpt2, gpt2-xl, etc.)
• GPT BigCode (bigcode/starcoder, bigcode/gpt_bigcode-santacoder, etc.)
• GPT-J (EleutherAI/gpt-j-6b, nomic-ai/gpt4all-j, etc.)
• GPT-NeoX (EleutherAI/gpt-neox-20b, databricks/dolly-v2-12b, stabilityai/stablelm-tuned-alpha-7b, etc.)
• InternLM (internlm/internlm-7b, internlm/internlm-chat-7b, etc.)
• MPT (mosaicml/mpt-7b, mosaicml/mpt-30b, etc.)
• OPT (facebook/opt-66b, facebook/opt-iml-max-30b, etc.)
• Phi (microsoft/phi-1_5, microsoft/phi-2, etc.)
• Qwen (Qwen/Qwen-7B, Qwen/Qwen-7B-Chat, etc.)
• Yi (01-ai/Yi-6B, 01-ai/Yi-34B, etc.)

And any other models supported by vLLM 0.2.6.

Ensure that you have Docker installed and properly set up before running the docker build commands. Once built, you can deploy this serverless worker in your desired environment with confidence that it will automatically scale based on demand. For further inquiries or assistance, feel free to contact our support team.

Model Inputs

You may either use a prompt or a list of messages as input. If you use messages, the model's chat template will be applied to the messages automatically, so the model must have one. If you use prompt, you may optionally apply the model's chat template to the prompt by setting apply_chat_template to true.

Argument	Type	Default	Description
prompt	str		Prompt string to generate text based on.
messages	list[dict[str, str]]		List of messages, which will automatically have the model's chat template applied. Overrides prompt.
apply_chat_template	bool	False	Whether to apply the model's chat template to the prompt.
sampling_params	dict	{}	Sampling parameters to control the generation, like temperature, top_p, etc.
stream	bool	False	Whether to enable streaming of output. If True, responses are streamed as they are generated.
batch_size	int	DEFAULT_BATCH_SIZE	The number of responses to generate in one batch. Only applicable

Messages Format

Your list can contain any number of messages, and each message can have any role from the following list:

• user
• assistant
• system

The model's chat template will be applied to the messages automatically.

Example:

[
  {
    "role": "system",
    "content": "..."
  },
  {
    "role": "user",
    "content": "..."
  },
  {
    "role": "assistant",
    "content": "..."
  }
]

Sampling Parameters

Argument	Type	Default	Description
n	int	1	Number of output sequences to return for the given prompt.
best_of	Optional[int]	None	Number of output sequences generated from the prompt. The top n sequences are returned from these best_of sequences. Must be ≥ n. Treated as beam width in beam search. Default is n.
presence_penalty	float	0.0	Penalizes new tokens based on their presence in the generated text so far. Values > 0 encourage new tokens, values < 0 encourage repetition.
frequency_penalty	float	0.0	Penalizes new tokens based on their frequency in the generated text so far. Values > 0 encourage new tokens, values < 0 encourage repetition.
repetition_penalty	float	1.0	Penalizes new tokens based on their appearance in the prompt and generated text. Values > 1 encourage new tokens, values < 1 encourage repetition.
temperature	float	1.0	Controls the randomness of sampling. Lower values make it more deterministic, higher values make it more random. Zero means greedy sampling.
top_p	float	1.0	Controls the cumulative probability of top tokens to consider. Must be in (0, 1]. Set to 1 to consider all tokens.
top_k	int	-1	Controls the number of top tokens to consider. Set to -1 to consider all tokens.
min_p	float	0.0	Represents the minimum probability for a token to be considered, relative to the most likely token. Must be in [0, 1]. Set to 0 to disable.
use_beam_search	bool	False	Whether to use beam search instead of sampling.
length_penalty	float	1.0	Penalizes sequences based on their length. Used in beam search.
early_stopping	Union[bool, str]	False	Controls stopping condition in beam search. Can be True, False, or "never".
stop	Union[None, str, List[str]]	None	List of strings that stop generation when produced. Output will not contain these strings.
stop_token_ids	Optional[List[int]]	None	List of token IDs that stop generation when produced. Output contains these tokens unless they are special tokens.
ignore_eos	bool	False	Whether to ignore the End-Of-Sequence token and continue generating tokens after its generation.
max_tokens	int	16	Maximum number of tokens to generate per output sequence.
logprobs	Optional[int]	None	Number of log probabilities to return per output token.
prompt_logprobs	Optional[int]	None	Number of log probabilities to return per prompt token.
skip_special_tokens	bool	True	Whether to skip special tokens in the output.
spaces_between_special_tokens	bool	True	Whether to add spaces between special tokens in the output.

Sample Inputs and Outputs

No Chat Template, No Streaming

Functions like a text completion model. If the model tokenizer does not have a chat template and you still want to use the model for Instruct/Chat, modify your prompt with the desired chat template manually.

Input:

{
  "input": {
    "prompt": "With great power,",
    "sampling_params": {
      "max_tokens": 5
    }
  }
}

Output:

{
  "delayTime": 1234,
  "executionTime": 1234,
  "id": "...",
  "output": [
    [
      {
        "text": " comes great responsibility. This",
        "usage": {
          "input": 6,
          "output": 5
        }
      }
    ]
  ],
  "status": "COMPLETED"
}

Chat Template, No Streaming

Functions like a Chat model

Input:

{
  "input": {
    "prompt": "Tell me why RunPod is the best GPU provider",
    "sampling_params": {
      "max_tokens": 100
    },
    "apply_chat_template": true
  }
}

Output:

{
  "delayTime": 1234,
  "executionTime": 1234,
  "id": "...",
  "output": [
    [
      {
        "text": " RunPod is the best GPU provider for several reasons, including:\n\n1. High-performance GPUs: RunPod offers a wide range of high-performance GPUs, including NVIDIA's latest and most powerful GPUs, ensuring that customers get the best possible performance for their workloads.\n2. Scalability: RunPod allows users to easily scale their GPU resources up or down based on their needs, making it an ideal choice for businesses with fluctuating work",
        "usage": {
          "input": 27,
          "output": 100
        }
      }
    ]
  ],
  "status": "COMPLETED"
}

List of Messages (Chat Template applied by default), No Streaming

Functions like a Chat model with a list of messages, to which the model's chat template is applied. You may also use a "system" role and message.

Input:

{
  "input": {
    "messages": [
      {
        "role": "user",
        "content": "Tell me why RunPod is the best GPU provider"
      },
      {
        "role": "assistant",
        "content": "RunPod is the best GPU provider for several reasons."
      },
      {
        "role": "user",
        "content": "Name 3 resons"
      }
    ],
    "sampling_params": {
      "max_tokens": 100
    }
  }
}

Output:

{
  "delayTime": 1234,
  "executionTime": 1234,
  "id": "...",
  "output": [
    [
      {
        "text": " 1. Cutting-edge hardware: RunPod offers state-of-the-art GPUs from industry-leading manufacturers, ensuring that users have access to the latest technology for their GPU needs.\n\n2. Scalability and flexibility: RunPod provides a wide range of GPU options, allowing users to easily scale their resources up or down depending on their specific requirements, and pay only for what they use.\n\n3. Exceptional customer support: RunPod is dedicated to providing outstanding",
        "usage": {
          "input": 59,
          "output": 100
        }
      }
    ]
  ],
  "status": "COMPLETED"
}

Chat Template, Streaming

Functions like a Chat model, but with streaming output. This is the recommended way to use the vLLM worker.

Input:

{
  "input": {
    "prompt": "Tell me why RunPod is the best GPU provider",
    "sampling_params": {
      "max_tokens": 100
    },
    "apply_chat_template": true,
    "stream": true
  }
}

Output:

{
  "delayTime": 1234,
  "executionTime": 1234,
  "id": "...",
  "output": [
    [
      {
        "text": " Run",
        "usage": {
          "input": 27,
          "output": 1
        }
      },
      {
        "text": "Pod",
        "usage": {
          "input": 27,
          "output": 2
        }
      },
      {
        "text": " is",
        "usage": {
          "input": 27,
          "output": 3
        }
      },
      {
        "text": " considered",
        "usage": {
          "input": 27,
          "output": 4
        }
      },
      {
        "text": " the",
        "usage": {
          "input": 27,
          "output": 5
        }
      },
      {
        "text": " best",
        "usage": {
          "input": 27,
          "output": 6
        }
      },
      {
        "text": " GPU",
        "usage": {
          "input": 27,
          "output": 7
        }
      },
      {
        "text": " provider",
        "usage": {
          "input": 27,
          "output": 8
        }
      },
      {
        "text": " for",
        "usage": {
          "input": 27,
          "output": 9
        }
      },
      {
        "text": " several",
        "usage": {
          "input": 27,
          "output": 10
        }
      }
    ]
  ],
  "status": "COMPLETED"
}