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transformers/docs/source/zh/main_classes/callback.md
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transformers/docs/source/zh/main_classes/callback.md
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# Callbacks
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Callbacks可以用来自定义PyTorch [Trainer]中训练循环行为的对象(此功能尚未在TensorFlow中实现),该对象可以检查训练循环状态(用于进度报告、在TensorBoard或其他ML平台上记录日志等),并做出决策(例如提前停止)。
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Callbacks是“只读”的代码片段,除了它们返回的[TrainerControl]对象外,它们不能更改训练循环中的任何内容。对于需要更改训练循环的自定义,您应该继承[Trainer]并重载您需要的方法(有关示例,请参见[trainer](trainer))。
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默认情况下,`TrainingArguments.report_to` 设置为"all",然后[Trainer]将使用以下callbacks。
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- [`DefaultFlowCallback`],它处理默认的日志记录、保存和评估行为
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- [`PrinterCallback`] 或 [`ProgressCallback`],用于显示进度和打印日志(如果通过[`TrainingArguments`]停用tqdm,则使用第一个函数;否则使用第二个)。
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- [`~integrations.TensorBoardCallback`],如果TensorBoard可访问(通过PyTorch版本 >= 1.4 或者 tensorboardX)。
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- [`~integrations.WandbCallback`],如果安装了[wandb](https://www.wandb.com/)。
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- [`~integrations.CometCallback`],如果安装了[comet_ml](https://www.comet.com/site/)。
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- [`~integrations.MLflowCallback`],如果安装了[mlflow](https://www.mlflow.org/)。
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- [`~integrations.NeptuneCallback`],如果安装了[neptune](https://neptune.ai/)。
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- [`~integrations.AzureMLCallback`],如果安装了[azureml-sdk](https://pypi.org/project/azureml-sdk/)。
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- [`~integrations.CodeCarbonCallback`],如果安装了[codecarbon](https://pypi.org/project/codecarbon/)。
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- [`~integrations.ClearMLCallback`],如果安装了[clearml](https://github.com/allegroai/clearml)。
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- [`~integrations.DagsHubCallback`],如果安装了[dagshub](https://dagshub.com/)。
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- [`~integrations.FlyteCallback`],如果安装了[flyte](https://flyte.org/)。
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- [`~integrations.DVCLiveCallback`],如果安装了[dvclive](https://dvc.org/doc/dvclive)。
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- [`~integrations.SwanLabCallback`],如果安装了[swanlab](http://swanlab.cn/)。
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如果安装了一个软件包,但您不希望使用相关的集成,您可以将 `TrainingArguments.report_to` 更改为仅包含您想要使用的集成的列表(例如 `["azure_ml", "wandb"]`)。
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实现callbacks的主要类是[`TrainerCallback`]。它获取用于实例化[`Trainer`]的[`TrainingArguments`],可以通过[`TrainerState`]访问该Trainer的内部状态,并可以通过[`TrainerControl`]对训练循环执行一些操作。
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## 可用的Callbacks
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这里是库里可用[`TrainerCallback`]的列表:
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[[autodoc]] integrations.CometCallback
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- setup
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[[autodoc]] DefaultFlowCallback
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[[autodoc]] PrinterCallback
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[[autodoc]] ProgressCallback
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[[autodoc]] EarlyStoppingCallback
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[[autodoc]] integrations.TensorBoardCallback
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[[autodoc]] integrations.WandbCallback
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- setup
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[[autodoc]] integrations.MLflowCallback
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- setup
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[[autodoc]] integrations.AzureMLCallback
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[[autodoc]] integrations.CodeCarbonCallback
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[[autodoc]] integrations.NeptuneCallback
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[[autodoc]] integrations.ClearMLCallback
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[[autodoc]] integrations.DagsHubCallback
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[[autodoc]] integrations.FlyteCallback
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[[autodoc]] integrations.DVCLiveCallback
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- setup
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[[autodoc]] integrations.SwanLabCallback
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- setup
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## TrainerCallback
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[[autodoc]] TrainerCallback
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以下是如何使用PyTorch注册自定义callback的示例:
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[`Trainer`]:
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```python
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class MyCallback(TrainerCallback):
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"A callback that prints a message at the beginning of training"
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def on_train_begin(self, args, state, control, **kwargs):
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print("Starting training")
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trainer = Trainer(
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model,
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args,
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train_dataset=train_dataset,
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eval_dataset=eval_dataset,
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callbacks=[MyCallback], # We can either pass the callback class this way or an instance of it (MyCallback())
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)
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```
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注册callback的另一种方式是调用 `trainer.add_callback()`,如下所示:
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```python
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trainer = Trainer(...)
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trainer.add_callback(MyCallback)
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# Alternatively, we can pass an instance of the callback class
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trainer.add_callback(MyCallback())
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```
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## TrainerState
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[[autodoc]] TrainerState
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## TrainerControl
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[[autodoc]] TrainerControl
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