avalanche.training.GEM

class avalanche.training.GEM(model: ~torch.nn.modules.module.Module, optimizer: ~torch.optim.optimizer.Optimizer, criterion, patterns_per_exp: int, memory_strength: float = 0.5, train_mb_size: int = 1, train_epochs: int = 1, eval_mb_size: ~typing.Optional[int] = None, device=None, plugins: ~typing.Optional[~typing.List[~avalanche.core.SupervisedPlugin]] = None, evaluator: ~avalanche.training.plugins.evaluation.EvaluationPlugin = <avalanche.training.plugins.evaluation.EvaluationPlugin object>, eval_every=-1, **base_kwargs)[source]

Gradient Episodic Memory (GEM) strategy.

See GEM plugin for details. This strategy does not use task identities.

__init__(model: ~torch.nn.modules.module.Module, optimizer: ~torch.optim.optimizer.Optimizer, criterion, patterns_per_exp: int, memory_strength: float = 0.5, train_mb_size: int = 1, train_epochs: int = 1, eval_mb_size: ~typing.Optional[int] = None, device=None, plugins: ~typing.Optional[~typing.List[~avalanche.core.SupervisedPlugin]] = None, evaluator: ~avalanche.training.plugins.evaluation.EvaluationPlugin = <avalanche.training.plugins.evaluation.EvaluationPlugin object>, eval_every=-1, **base_kwargs)[source]

Init.

Parameters

  • model – The model.

  • optimizer – The optimizer to use.

  • criterion – The loss criterion to use.

  • patterns_per_exp – number of patterns per experience in the memory

  • memory_strength – offset to add to the projection direction in order to favour backward transfer (gamma in original paper).

  • train_mb_size – The train minibatch size. Defaults to 1.

  • train_epochs – The number of training epochs. Defaults to 1.

  • eval_mb_size – The eval minibatch size. Defaults to 1.

  • device – The device to use. Defaults to None (cpu).

  • plugins – Plugins to be added. Defaults to None.

  • evaluator – (optional) instance of EvaluationPlugin for logging and metric computations.

  • eval_every – the frequency of the calls to eval inside the training loop. -1 disables the evaluation. 0 means eval is called only at the end of the learning experience. Values >0 mean that eval is called every eval_every epochs and at the end of the learning experience.

  • base_kwargs – any additional BaseTemplate constructor arguments.

Methods

__init__(model, optimizer, criterion, ...[, ...])

Init.

backward()

Run the backward pass.

criterion()

Loss function.

eval(exp_list, **kwargs)

Evaluate the current model on a series of experiences and returns the last recorded value for each metric.

eval_dataset_adaptation(**kwargs)

Initialize self.adapted_dataset.

eval_epoch(**kwargs)

Evaluation loop over the current self.dataloader.

forward()

Compute the model's output given the current mini-batch.

make_eval_dataloader([num_workers, ...])

Initializes the eval data loader. :param num_workers: How many subprocesses to use for data loading. 0 means that the data will be loaded in the main process. (default: 0). :param pin_memory: If True, the data loader will copy Tensors into CUDA pinned memory before returning them. Defaults to True. :param kwargs: :return:.

make_optimizer()

Optimizer initialization.

make_train_dataloader([num_workers, ...])

Data loader initialization.

model_adaptation([model])

Adapts the model to the current data.

optimizer_step()

Execute the optimizer step (weights update).

stop_training()

Signals to stop training at the next iteration.

train(experiences[, eval_streams])

Training loop.

train_dataset_adaptation(**kwargs)

Initialize self.adapted_dataset.

training_epoch(**kwargs)

Training epoch.

Attributes

is_eval

True if the strategy is in evaluation mode.

mb_task_id

Current mini-batch task labels.

mb_x

Current mini-batch input.

mb_y

Current mini-batch target.