37 lines
1.3 KiB
Python
37 lines
1.3 KiB
Python
# SPDX-License-Identifier: Apache-2.0
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import os
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from vllm import LLM, SamplingParams
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# vLLM does not guarantee the reproducibility of the results by default,
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# for the sake of performance. You need to do the following to achieve
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# reproducible results:
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# 1. Turn off multiprocessing to make the scheduling deterministic.
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# NOTE(woosuk): This is not needed and will be ignored for V0.
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os.environ["VLLM_ENABLE_V1_MULTIPROCESSING"] = "0"
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# 2. Fix the global seed for reproducibility. The default seed is None, which is
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# not reproducible.
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SEED = 42
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# NOTE(woosuk): Even with the above two settings, vLLM only provides
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# reproducibility when it runs on the same hardware and the same vLLM version.
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# Also, the online serving API (`vllm serve`) does not support reproducibility
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# because it is almost impossible to make the scheduling deterministic in the
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# online serving setting.
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llm = LLM(model="facebook/opt-125m", seed=SEED)
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prompts = [
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"Hello, my name is",
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"The president of the United States is",
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"The capital of France is",
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"The future of AI is",
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]
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sampling_params = SamplingParams(temperature=0.8, top_p=0.95)
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outputs = llm.generate(prompts, sampling_params)
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for output in outputs:
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prompt = output.prompt
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generated_text = output.outputs[0].text
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print(f"Prompt: {prompt!r}, Generated text: {generated_text!r}")
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