73 lines
2.4 KiB
Python
73 lines
2.4 KiB
Python
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#
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# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
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# This file is a part of the vllm-ascend project.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""
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Example: Access request-level metrics from vLLM outputs.
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By default, vLLM disables log stats (disable_log_stats=True), which causes
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output.metrics to be None. To populate metrics such as first_token_time,
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finished_time, etc., you must explicitly set disable_log_stats=False when
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creating the LLM instance.
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See: https://github.com/vllm-project/vllm-ascend/issues/5027
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"""
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# isort: skip_file
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import os
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os.environ["VLLM_USE_MODELSCOPE"] = "True"
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os.environ["VLLM_WORKER_MULTIPROC_METHOD"] = "spawn"
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from vllm import LLM, SamplingParams
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def main():
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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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# Create a sampling params object.
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sampling_params = SamplingParams(max_tokens=100, temperature=0.0)
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# IMPORTANT: Set disable_log_stats=False to enable output.metrics.
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# Without this, output.metrics will be None.
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llm = LLM(model="Qwen/Qwen2.5-0.5B-Instruct", disable_log_stats=False)
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# Generate texts from the prompts.
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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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metrics = output.metrics
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print(f"Prompt: {prompt!r}")
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print(f" Generated text: {generated_text!r}")
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if metrics is not None:
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print(f" Arrival time: {metrics.arrival_time}")
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print(f" First scheduled time: {metrics.first_scheduled_time}")
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print(f" First token time: {metrics.first_token_time}")
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print(f" Finished time: {metrics.finished_time}")
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else:
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print(" Metrics: None (set disable_log_stats=False to enable)")
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print()
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if __name__ == "__main__":
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main()
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