trainer_base

class Trainer(model: Optional[Union[paddlenlp.transformers.model_utils.PretrainedModel, paddle.fluid.dygraph.layers.Layer]] = None, criterion: Optional[paddle.fluid.dygraph.layers.Layer] = None, args: Optional[paddlenlp.trainer.training_args.TrainingArguments] = None, data_collator: Optional[DataCollator] = None, train_dataset: Optional[paddle.fluid.dataloader.dataset.Dataset] = None, eval_dataset: Optional[paddle.fluid.dataloader.dataset.Dataset] = None, tokenizer: Optional[paddlenlp.transformers.tokenizer_utils.PretrainedTokenizer] = None, compute_metrics: Optional[Callable[[paddlenlp.trainer.trainer_utils.EvalPrediction], Dict]] = None, callbacks: Optional[List[paddlenlp.trainer.trainer_callback.TrainerCallback]] = None, optimizers: Tuple[paddle.optimizer.optimizer.Optimizer, paddle.optimizer.lr.LRScheduler] = (None, None))

基类：object

Trainer is a simple but feature-complete training and eval loop for PaddlePaddle, optimized for PaddleNLP.

参数

• model ([PretrainedModel] or paddle.nn.Layer, optional) --

  The model to train, evaluate or use for predictions.

  [Trainer] is optimized to work with the [PretrainedModel] provided by the library. You can still use your own models defined as paddle.nn.Layer as long as they work the same way as the PaddleNLP models.

• criterion (paddle.nn.Layer, optional) -- The model may only output the loggit, if you want do more computation for the output of model, you can add the criterion Layer.

• args ([TrainingArguments], optional) -- The arguments to tweak for training. Will default to a basic instance of [TrainingArguments] with the output_dir set to a directory named tmp_trainer in the current directory if not provided.

• data_collator (DataCollator, optional) -- The function to use to form a batch from a list of elements of train_dataset or eval_dataset. Will default to [default_data_collator] if no tokenizer is provided, an instance of [DataCollatorWithPadding] otherwise.

• train_dataset (paddle.io.Dataset or paddle.io.IterableDataset, optional) -- The dataset to use for training. If it is an datasets.Dataset, columns not accepted by the model.forward() method are automatically removed.

• eval_dataset (paddle.io.Dataset, optional) -- The dataset to use for evaluation. If it is an datasets.Dataset, columns not accepted by the model.forward() method are automatically removed.

• tokenizer ([PretrainedTokenizer], optional) -- The tokenizer used to preprocess the data. If provided, will be used to automatically pad the inputs the maximum length when batching inputs, and it will be saved along the model to make it easier to rerun an interrupted training or reuse the fine-tuned model.

• compute_metrics (Callable[[EvalPrediction], Dict], optional) -- The function that will be used to compute metrics at evaluation. Must take a [EvalPrediction] and return a dictionary string to metric values.

• callbacks (List of [TrainerCallback], optional) -- A list of callbacks to customize the training loop. Will add those to the list of default callbacks. If you want to remove one of the default callbacks used, use the [Trainer.remove_callback] method.

• optimizers (Tuple[paddle.optimizer.Optimizer, paddle.optimizer.lr.LRScheduler], optional) -- A tuple containing the optimizer and the scheduler to use. Will default to an instance of [AdamW] on your model and a scheduler given by [get_linear_schedule_with_warmup] controlled by args.

Important attributes:

• model -- Always points to the core model. If using a transformers model, it will be a [PretrainedModel] subclass.

• model_wrapped -- Always points to the most external model in case one or more other modules wrap the original model. This is the model that should be used for the forward pass. For example, the inner model is wrapped in paddle.DataParallel. If model hasn't been wrapped, then self.model_wrapped is the same as self.model.

log_metrics(split, metrics)

Log metrics in a specially formatted way Under distributed environment this is done only for a process with rank 0. :param split: Mode/split name: one of train, eval, test :type split: str :param metrics: The metrics returned from train/evaluate/predictmetrics: metrics dict :type metrics: Dict[str, float]

metrics_format(metrics: Dict[str, float]) → Dict[str, float]

Reformat Trainer metrics values to a human-readable format :param metrics: The metrics returned from train/evaluate/predict :type metrics: Dict[str, float]

返回

The reformatted metrics

返回类型

metrics (Dict[str, float])

save_metrics(split, metrics, combined=True)

Save metrics into a json file for that split, e.g. train_results.json. Under distributed environment this is done only for a process with rank 0. :param split: Mode/split name: one of train, eval, test, all :type split: str :param metrics: The metrics returned from train/evaluate/predict :type metrics: Dict[str, float] :param combined: Creates combined metrics by updating all_results.json with metrics of this call :type combined: bool, optional, defaults to True

To understand the metrics please read the docstring of [log_metrics]. The only difference is that raw unformatted numbers are saved in the current method.

save_state()

Saves the Trainer state, since Trainer.save_model saves only the tokenizer with the model Under distributed environment this is done only for a process with rank 0.

add_callback(callback)

Add a callback to the current list of [TrainerCallback].

参数

callback (type or [TrainerCallback]) -- A [TrainerCallback] class or an instance of a [TrainerCallback]. In the first case, will instantiate a member of that class.

pop_callback(callback)

Remove a callback from the current list of [TrainerCallback] and returns it. If the callback is not found, returns None (and no error is raised). :param callback: A [TrainerCallback] class or an instance of a [TrainerCallback]. In the

first case, will pop the first member of that class found in the list of callbacks.

返回

The callback removed, if found.

返回类型

[TrainerCallback]

remove_callback(callback)

Remove a callback from the current list of [TrainerCallback]. :param callback: A [TrainerCallback] class or an instance of a [TrainerCallback]. In the

first case, will remove the first member of that class found in the list of callbacks.

load_state_dict_from_checkpoint(resume_from_checkpoint=None)

load state_dict from_checkpoint, Only load model state dict.

参数

resume_from_checkpoint (str or bool, optional) -- If a str, local path to a saved checkpoint as saved by a previous instance of [Trainer]. If a bool and equals True, load the last checkpoint in args.output_dir as saved by a previous instance of [Trainer]. Only load model state dict.

train(resume_from_checkpoint: Optional[Union[bool, str]] = None, ignore_keys_for_eval: Optional[List[str]] = None)

Main training entry point.

参数

• resume_from_checkpoint (str or bool, optional) -- If a str, local path to a saved checkpoint as saved by a previous instance of [Trainer]. If a bool and equals True, load the last checkpoint in args.output_dir as saved by a previous instance of [Trainer]. If present, training will resume from the model/optimizer/scheduler states loaded here.

• ignore_keys_for_eval (List[str], optional) -- A list of keys in the output of your model (if it is a dictionary) that should be ignored when gathering predictions for evaluation during the training.

get_train_dataloader()

Returns the training [DataLoader].

Will use no sampler if self.train_dataset does not implement __len__, a random sampler (adapted to distributed training if necessary) otherwise.

Subclass and override this method if you want to inject some custom behavior.

get_eval_dataloader(eval_dataset: Optional[paddle.fluid.dataloader.dataset.Dataset] = None) → paddle.fluid.reader.DataLoader

Returns the evaluation [DataLoader].

Subclass and override this method if you want to inject some custom behavior.

参数

eval_dataset (paddle.io.Dataset, optional) -- If provided, will override self.eval_dataset. If it is an datasets.Dataset, columns not accepted by the model.forward() method are automatically removed. It must implement __len__.

get_test_dataloader(test_dataset: paddle.fluid.dataloader.dataset.Dataset) → paddle.fluid.reader.DataLoader

Returns the test [DataLoader].

Subclass and override this method if you want to inject some custom behavior.

参数

test_dataset (paddle.io.Dataset, optional) -- The test dataset to use. If it is an datasets.Dataset, columns not accepted by the model.forward() method are automatically removed. It must implement __len__.

create_optimizer_and_scheduler(num_training_steps: int)

Setup the optimizer and the learning rate scheduler.

We provide a reasonable default that works well. If you want to use something else, you can pass a tuple in the Trainer's init through optimizers, or subclass and override this method (or create_optimizer and/or create_scheduler) in a subclass.

create_optimizer(lr_scheduler=None)

Setup the optimizer.

We provide a reasonable default that works well. If you want to use something else, you can pass a tuple in the Trainer's init through optimizers, or subclass and override this method in a subclass.

static get_optimizer_cls_and_kwargs(args: paddlenlp.trainer.training_args.TrainingArguments) → Tuple[Any, Any]

Returns the optimizer class and optimizer parameters based on the training arguments.

参数

args (paddlenlp.training_args.TrainingArguments) -- The training arguments for the training session.

create_scheduler(num_training_steps: int)

Setup the scheduler. The optimizer of the trainer must have been set up either before this method is called or passed as an argument.

参数

num_training_steps (int) -- The number of training steps to do.

autocast_smart_context_manager()

A helper wrapper that creates an appropriate context manager for autocast while feeding it the desired arguments, depending on the situation.

compute_loss(model, inputs, return_outputs=False)

How the loss is computed by Trainer. By default, all models return the loss in the first element. Subclass and override for custom behavior.

training_step(model: paddle.fluid.dygraph.layers.Layer, inputs: Dict[str, Union[paddle.Tensor, Any]]) → paddle.Tensor

Perform a training step on a batch of inputs.

Subclass and override to inject custom behavior.

参数

• model (nn.Layer) -- The model to train.

• inputs (Dict[str, Union[paddle.Tensor, Any]]) --

  The inputs and targets of the model.

  The dictionary will be unpacked before being fed to the model. Most models expect the targets under the argument labels. Check your model's documentation for all accepted arguments.

返回

The tensor with training loss on this batch.

返回类型

paddle.Tensor

save_model(output_dir: Optional[str] = None)

Will save the model, so you can reload it using from_pretrained().

Will only save from the main process.

log(logs: Dict[str, float]) → None

Log logs on the various objects watching training.

Subclass and override this method to inject custom behavior.

参数

logs (Dict[str, float]) -- The values to log.

evaluate(eval_dataset: Optional[paddle.fluid.dataloader.dataset.Dataset] = None, ignore_keys: Optional[List[str]] = None, metric_key_prefix: str = 'eval') → Dict[str, float]

Run evaluation and returns metrics.

The calling script will be responsible for providing a method to compute metrics, as they are task-dependent (pass it to the init compute_metrics argument).

You can also subclass and override this method to inject custom behavior.

参数

• eval_dataset (Dataset, optional) -- Pass a dataset if you wish to override self.eval_dataset. If it is an datasets.Dataset, columns not accepted by the model.forward() method are automatically removed. It must implement the __len__ method.

• ignore_keys (Lst[str], optional) -- A list of keys in the output of your model (if it is a dictionary) that should be ignored when gathering predictions.

• metric_key_prefix (str, optional, defaults to "eval") -- An optional prefix to be used as the metrics key prefix. For example the metrics "bleu" will be named "eval_bleu" if the prefix is "eval" (default)

返回

A dictionary containing the evaluation loss and the potential metrics computed from the predictions. The dictionary also contains the epoch number which comes from the training state.

evaluation_loop(dataloader: paddle.fluid.reader.DataLoader, description: str, prediction_loss_only: Optional[bool] = None, ignore_keys: Optional[List[str]] = None, metric_key_prefix: str = 'eval', max_eval_iters: Optional[int] = - 1) → paddlenlp.trainer.trainer_utils.EvalLoopOutput

Prediction/evaluation loop, shared by Trainer.evaluate() and Trainer.predict().

Works both with or without labels.

predict(test_dataset: paddle.fluid.dataloader.dataset.Dataset, ignore_keys: Optional[List[str]] = None, metric_key_prefix: str = 'test') → paddlenlp.trainer.trainer_utils.PredictionOutput

Run prediction and returns predictions and potential metrics. Depending on the dataset and your use case, your test dataset may contain labels. In that case, this method will also return metrics, like in evaluate(). :param test_dataset: Dataset to run the predictions on. If it is an datasets.Dataset, columns not accepted by the

model.forward() method are automatically removed. Has to implement the method __len__

参数

• ignore_keys (Lst[str], optional) -- A list of keys in the output of your model (if it is a dictionary) that should be ignored when gathering predictions.

• metric_key_prefix (str, optional, defaults to "test") -- An optional prefix to be used as the metrics key prefix. For example the metrics "bleu" will be named "test_bleu" if the prefix is "test" (default)

<Tip> If your predictions or labels have different sequence length (for instance because you're doing dynamic padding in a token classification task) the predictions will be padded (on the right) to allow for concatenation into one array. The padding index is -100. </Tip> Returns: NamedTuple A namedtuple with the following keys:

• predictions (np.ndarray): The predictions on test_dataset.

• label_ids (np.ndarray, optional): The labels (if the dataset contained some).

• metrics (Dict[str, float], optional): The potential dictionary of metrics (if the dataset contained labels).

prediction_step(model: paddle.fluid.dygraph.layers.Layer, inputs: Dict[str, Union[paddle.Tensor, Any]], prediction_loss_only: bool, ignore_keys: Optional[List[str]] = None) → Tuple[Optional[paddle.Tensor], Optional[paddle.Tensor], Optional[paddle.Tensor]]

Perform an evaluation step on model using inputs.

Subclass and override to inject custom behavior.

参数

• model (nn.Layer) -- The model to evaluate.

• inputs (Dict[str, Union[paddle.Tensor, Any]]) --

  The inputs and targets of the model.

  The dictionary will be unpacked before being fed to the model. Most models expect the targets under the argument labels. Check your model's documentation for all accepted arguments.

• prediction_loss_only (bool) -- Whether or not to return the loss only.

• ignore_keys (Lst[str], optional) -- A list of keys in the output of your model (if it is a dictionary) that should be ignored when gathering predictions.

返回

A tuple with the loss, logits and labels (each being optional).

返回类型

Tuple[Optional[paddle.Tensor], Optional[paddle.Tensor], Optional[paddle.Tensor]]

num_examples(dataloader: paddle.fluid.reader.DataLoader) → int

Helper to get number of samples in a [DataLoader] by accessing its dataset.

Will raise an exception if the underlying dataset does not implement method __len__

is_local_process_zero() → bool

Whether or not this process is the local (e.g., on one machine if training in a distributed fashion on several machines) main process.

is_world_process_zero() → bool

Whether or not this process is the global main process (when training in a distributed fashion on several machines, this is only going to be True for one process).

print_config(args=None, key='')

print config values