ml.tasks.gan.base

Defines the base GAN task type.

This class expects you to implement the following functions:

class MyGanTask(
    ml.GenerativeAdversarialNetworkTask[
        Config,
        Generator,
        Discriminator,
        Batch,
        GeneratorOutput,
        DiscriminatorOutput,
        Loss,
    ],
):
    def run_generator(self, model: Generator, batch: Batch, state: ml.State) -> GeneratorOutput:
        ...

    def run_discriminator(
        self,
        model: Discriminator,
        batch: Batch,
        gen_output: GeneratorOutput,
        state: ml.State,
    ) -> DiscriminatorOutput:
        ...

    def compute_discriminator_loss(
        self,
        generator: Generator,
        discriminator: Discriminator,
        batch: Batch,
        state: ml.State,
        gen_output: GeneratorOutput,
        dis_output: DiscriminatorOutput,
    ) -> Loss:
        ...

    def get_dataset(self, phase: ml.Phase) -> Dataset:
        ...

class ml.tasks.gan.base.GenerativeAdversarialNetworkTaskConfig(max_epochs: int | None = None, max_steps: int | None = None, max_samples: int | None = None, max_seconds: float | None = None, train_dl: ml.tasks.base.DataLoaderConfig = <factory>, valid_dl: ml.tasks.base.DataLoaderConfig = <factory>, test_dl: ml.tasks.base.DataLoaderConfig = <factory>, name: str = '???', errors: ml.tasks.datasets.error_handling.ErrorHandlingConfig = <factory>)[source]: Bases: SupervisedLearningTaskConfig

class ml.tasks.gan.base.GenerativeAdversarialNetworkTask(config: BaseTaskConfigT)[source]

Bases: SupervisedLearningTask[GenerativeAdversarialNetworkTaskConfigT, GenerativeAdversarialNetworkModel[GeneratorT, DiscriminatorT], Batch, tuple[GeneratorOutput, DiscriminatorOutput], dict[str, Tensor]], Generic[GenerativeAdversarialNetworkTaskConfigT, GeneratorT, DiscriminatorT, Batch, GeneratorOutput, DiscriminatorOutput], ABC

Initializes internal Module state, shared by both nn.Module and ScriptModule.

abstract run_generator(generator: GeneratorT, batch: Batch, state: State) → GeneratorOutput[source]

Runs the generator model on the given batch.

Parameters:

generator – The generator module.
batch – The batch to run the model on.
state – The current training state.

Returns:

The output of the generator model

abstract run_discriminator(discriminator: DiscriminatorT, batch: Batch, gen_output: GeneratorOutput, state: State) → DiscriminatorOutput[source]

Runs the discriminator model on the given batch.

Parameters:

discriminator – The discriminator model.
batch – The batch to run the model on.
gen_output – The output of the generator model.
state – The current training state.

Returns:

The output of the discriminator model

abstract compute_discriminator_loss(generator: GeneratorT, discriminator: DiscriminatorT, batch: Batch, state: State, gen_output: GeneratorOutput, dis_output: DiscriminatorOutput) → dict[str, torch.Tensor][source]

Computes the discriminator loss for the given batch.

Parameters:

generator – The generator model.
discriminator – The discriminator model.
batch – The batch to run the model on.
state – The current training state.
gen_output – The output of the generator model.
dis_output – The output of the discriminator model.

Returns:

The discriminator loss.

compute_generator_loss(generator: GeneratorT, discriminator: DiscriminatorT, batch: Batch, state: State, gen_output: GeneratorOutput, dis_output: DiscriminatorOutput) → dict[str, torch.Tensor][source]

do_logging(generator: GeneratorT, discriminator: DiscriminatorT, batch: Batch, state: State, gen_output: GeneratorOutput, dis_output: DiscriminatorOutput, losses: dict[str, torch.Tensor]) → None[source]

Override this method to perform any logging.

This will avoid some annoying context manager issues.

run_model(model: GenerativeAdversarialNetworkModel[GeneratorT, DiscriminatorT], batch: Batch, state: State) → tuple[GeneratorOutput, DiscriminatorOutput][source]

Runs a single training step and returns the outputs.

Parameters:

model – The current nn.Module
batch – The current batch
state – The current trainer state

Returns:

The outputs from the model

compute_loss(model: GenerativeAdversarialNetworkModel[GeneratorT, DiscriminatorT], batch: Batch, state: State, output: tuple[GeneratorOutput, DiscriminatorOutput]) → dict[str, torch.Tensor][source]

Computes the loss for a given output.

If the loss is a tensor, it should have shape (B). If the loss is a dictionary of tensors, each tensor should have the same shape (B).

Parameters:

model – The current nn.Module
batch – The current batch
state – The current trainer state
output – The model output from run_model

Returns:

The computed loss, as a tensor or dictionary of tensors

separate_losses(losses: dict[str, torch.Tensor]) → tuple[dict[str, torch.Tensor], dict[str, torch.Tensor]][source]

on_after_gan_forward_step(generator: GeneratorT, discriminator: DiscriminatorT, batch: Batch, state: State, gen_output: GeneratorOutput, dis_output: DiscriminatorOutput) → None[source]

GAN-specific hook that is called after a forward step.

This is useful for implementing the Wasserstein GAN gradient penalty.

Parameters:

generator – The generator model.
discriminator – The discriminator model.
batch – The batch to run the model on.
state – The current training state.
gen_output – The output of the generator model.
dis_output – The output of the discriminator model.

on_after_forward_step(model: GenerativeAdversarialNetworkModel[GeneratorT, DiscriminatorT], batch: Batch, output: tuple[GeneratorOutput, DiscriminatorOutput], state: State) → None[source]