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FastDeploy/docs/zh/features/early_stop.md
Zero Rains 4dc130c5a9 [Doc] add repetition early stopping doc (#3078)
* add repetition early stop doc

* add the early_stop.md
2025-07-29 22:01:57 -07:00

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# 早停功能
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。
1. Repetition策略
* 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。
* 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。
## 使用说明
在启动服务时,添加早停功能的启动项。
* 在线推理启动示例:
* 使用默认超参数:--enable-early-stop
```shell
python -m fastdeploy.entrypoints.openai.api_server \
--model baidu/ERNIE-4.5-0.3B-Paddle \
--port 8180 \
--metrics-port 8181 \
--engine-worker-queue-port 8182 \
--max-model-len 32768 \
--max-num-seqs 32 \
--enable-early-stop
```
* 使用自定义超参数:--early-stop-config
```shell
python -m fastdeploy.entrypoints.openai.api_server \
--model baidu/ERNIE-4.5-0.3B-Paddle \
--port 8180 \
--metrics-port 8181 \
--engine-worker-queue-port 8182 \
--max-model-len 32768 \
--max-num-seqs 32 \
--early-stop-config '{"enable_early_stop":true, "window_size": 1000, "threshold": 0.9}'
```
* 离线推理示例
* 使用默认超参数enable_early_stop
```python
from fastdeploy.engine.sampling_params import SamplingParams
from fastdeploy.entrypoints.llm import LLM
model_name_or_path = "baidu/ERNIE-4.5-0.3B-Paddle"
sampling_params = SamplingParams(temperature=0.1, max_tokens=30)
llm = LLM(model=model_name_or_path, tensor_parallel_size=1, enable_early_stop=True)
output = llm.generate(prompts="who are you?", use_tqdm=True, sampling_params=sampling_params)
print(output)
```
* 使用自定义超参数early_stop_config
```python
from fastdeploy.engine.sampling_params import SamplingParams
from fastdeploy.entrypoints.llm import LLM
model_name_or_path = "baidu/ERNIE-4.5-0.3B-Paddle"
early_stop_config = {"enable_early_stop":True, "window_size":1000, "threshold":0.9}
sampling_params = SamplingParams(temperature=0.1, max_tokens=30)
llm = LLM(model=model_name_or_path, tensor_parallel_size=1, early_stop_config=early_stop_config)
output = llm.generate(prompts="who are you?", use_tqdm=True, sampling_params=sampling_params)
print(output)
```
## 参数说明
* `enable_early_stop`: (bool) 是否启用早停功能默认设置为False。
* `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"。
* `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。
* `threshold`: (float) repetition策略中的高概率阈值默认设置为0.99。