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71 lines
3.0 KiB
Markdown
71 lines
3.0 KiB
Markdown
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# 早停功能
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早停功能用于提前结束模型生成token的过程,具体来说早停功能会采取不同的策略,判断当前生成的token序列是否满足早停条件,如果满足则提前结束token生成。FastDeploy目前只支持repetition策略。
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1. Repetition策略
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* Repetition策略通过检查生成高概率token的次数决定是否需要触发早停功能。
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* 具体来说,当某个batch生成token的概率连续超过用户设置的概率阈值达到用户指定的次数,将提前结束该batch的token生成过程。
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## 使用说明
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在启动服务时,添加早停功能的启动项。
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* 在线推理启动示例:
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* 使用默认超参数:--enable-early-stop
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```shell
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python -m fastdeploy.entrypoints.openai.api_server \
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--model baidu/ERNIE-4.5-0.3B-Paddle \
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--port 8180 \
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--metrics-port 8181 \
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--engine-worker-queue-port 8182 \
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--max-model-len 32768 \
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--max-num-seqs 32 \
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--enable-early-stop
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```
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* 使用自定义超参数:--early-stop-config
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```shell
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python -m fastdeploy.entrypoints.openai.api_server \
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--model baidu/ERNIE-4.5-0.3B-Paddle \
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--port 8180 \
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--metrics-port 8181 \
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--engine-worker-queue-port 8182 \
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--max-model-len 32768 \
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--max-num-seqs 32 \
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--early-stop-config '{"enable_early_stop":true, "window_size": 1000, "threshold": 0.9}'
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```
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* 离线推理示例
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* 使用默认超参数:enable_early_stop
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```python
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from fastdeploy.engine.sampling_params import SamplingParams
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from fastdeploy.entrypoints.llm import LLM
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model_name_or_path = "baidu/ERNIE-4.5-0.3B-Paddle"
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sampling_params = SamplingParams(temperature=0.1, max_tokens=30)
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llm = LLM(model=model_name_or_path, tensor_parallel_size=1, enable_early_stop=True)
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output = llm.generate(prompts="who are you?", use_tqdm=True, sampling_params=sampling_params)
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print(output)
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```
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* 使用自定义超参数:early_stop_config
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```python
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from fastdeploy.engine.sampling_params import SamplingParams
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from fastdeploy.entrypoints.llm import LLM
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model_name_or_path = "baidu/ERNIE-4.5-0.3B-Paddle"
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early_stop_config = {"enable_early_stop":True, "window_size":1000, "threshold":0.9}
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sampling_params = SamplingParams(temperature=0.1, max_tokens=30)
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llm = LLM(model=model_name_or_path, tensor_parallel_size=1, early_stop_config=early_stop_config)
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output = llm.generate(prompts="who are you?", use_tqdm=True, sampling_params=sampling_params)
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print(output)
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```
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## 参数说明
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* `enable_early_stop`: (bool) 是否启用早停功能,默认设置为False。
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* `strategy`: (str) 早停功能使用的策略,目前仅支持repetition策略,默认设置为"repetition"。
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* `window_size`: (int) repetition策略中连续出现高概率token的次数上限,超过该次数将触发早停功能,默认设置为3000。
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* `threshold`: (float) repetition策略中的高概率阈值,默认设置为0.99。
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