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GANomaly

GANomaly#

GANomaly: Semi-Supervised Anomaly Detection via Adversarial Training.

https://arxiv.org/abs/1805.06725

class anomalib.models.image.ganomaly.lightning_model.Ganomaly(batch_size=32, n_features=64, latent_vec_size=100, extra_layers=0, add_final_conv_layer=True, wadv=1, wcon=50, wenc=1, lr=0.0002, beta1=0.5, beta2=0.999)#

Bases: AnomalyModule

PL Lightning Module for the GANomaly Algorithm.

Parameters:

  • batch_size (int) – Batch size. Defaults to 32.

  • n_features (int) – Number of features layers in the CNNs. Defaults to 64.

  • latent_vec_size (int) – Size of autoencoder latent vector. Defaults to 100.

  • extra_layers (int, optional) – Number of extra layers for encoder/decoder. Defaults to 0.

  • add_final_conv_layer (bool, optional) – Add convolution layer at the end. Defaults to True.

  • wadv (int, optional) – Weight for adversarial loss. Defaults to 1.

  • wcon (int, optional) – Image regeneration weight. Defaults to 50.

  • wenc (int, optional) – Latent vector encoder weight. Defaults to 1.

  • lr (float, optional) – Learning rate. Defaults to 0.0002.

  • beta1 (float, optional) – Adam beta1. Defaults to 0.5.

  • beta2 (float, optional) – Adam beta2. Defaults to 0.999.

configure_optimizers()#

Configure optimizers for each decoder.

Returns:

Adam optimizer for each decoder

Return type:

Optimizer

property learning_type: LearningType#

Return the learning type of the model.

Returns:

Learning type of the model.

Return type:

LearningType

on_test_batch_end(outputs, batch, batch_idx, dataloader_idx=0)#

Normalize outputs based on min/max values.

Return type:

None

on_test_start()#

Reset min max values before test batch starts.

Return type:

None

on_validation_batch_end(outputs, batch, batch_idx, dataloader_idx=0)#

Normalize outputs based on min/max values.

Return type:

None

on_validation_start()#

Reset min and max values for current validation epoch.

Return type:

None

test_step(batch, batch_idx, *args, **kwargs)#

Update min and max scores from the current step.

Return type:

Union[Tensor, Mapping[str, Any], None]

property trainer_arguments: dict[str, Any]#

Return GANomaly trainer arguments.

training_step(batch, batch_idx)#

Perform the training step.

Parameters:

  • batch (dict[str, str | torch.Tensor]) – Input batch containing images.

  • batch_idx (int) – Batch index.

  • optimizer_idx (int) – Optimizer which is being called for current training step.

Returns:

Loss

Return type:

STEP_OUTPUT

validation_step(batch, *args, **kwargs)#

Update min and max scores from the current step.

Parameters:

  • batch (dict[str, str | torch.Tensor]) – Predicted difference between z and z_hat.

  • args – Additional arguments.

  • kwargs – Additional keyword arguments.

Returns:

Output predictions.

Return type:

(STEP_OUTPUT)

Torch models defining encoder, decoder, Generator and Discriminator.

Code adapted from samet-akcay/ganomaly.

class anomalib.models.image.ganomaly.torch_model.GanomalyModel(input_size, num_input_channels, n_features, latent_vec_size, extra_layers=0, add_final_conv_layer=True)#

Bases: Module

Ganomaly Model.

Parameters:

  • input_size (tuple[int, int]) – Input dimension.

  • num_input_channels (int) – Number of input channels.

  • n_features (int) – Number of features layers in the CNNs.

  • latent_vec_size (int) – Size of autoencoder latent vector.

  • extra_layers (int, optional) – Number of extra layers for encoder/decoder. Defaults to 0.

  • add_final_conv_layer (bool, optional) – Add convolution layer at the end. Defaults to True.

forward(batch)#

Get scores for batch.

Parameters:

batch (torch.Tensor) – Images

Returns:

Regeneration scores.

Return type:

Tensor

static weights_init(module)#

Initialize DCGAN weights.

Parameters:

module (nn.Module) – [description]

Return type:

None

Loss function for the GANomaly Model Implementation.

class anomalib.models.image.ganomaly.loss.DiscriminatorLoss#

Bases: Module

Discriminator loss for the GANomaly model.

forward(pred_real, pred_fake)#

Compute the loss for a predicted batch.

Parameters:

  • pred_real (torch.Tensor) – Discriminator predictions for the real image.

  • pred_fake (torch.Tensor) – Discriminator predictions for the fake image.

Returns:

The computed discriminator loss.

Return type:

Tensor

class anomalib.models.image.ganomaly.loss.GeneratorLoss(wadv=1, wcon=50, wenc=1)#

Bases: Module

Generator loss for the GANomaly model.

Parameters:

  • wadv (int, optional) – Weight for adversarial loss. Defaults to 1.

  • wcon (int, optional) – Image regeneration weight. Defaults to 50.

  • wenc (int, optional) – Latent vector encoder weight. Defaults to 1.

forward(latent_i, latent_o, images, fake, pred_real, pred_fake)#

Compute the loss for a batch.

Parameters:

  • latent_i (torch.Tensor) – Latent features of the first encoder.

  • latent_o (torch.Tensor) – Latent features of the second encoder.

  • images (torch.Tensor) – Real image that served as input of the generator.

  • fake (torch.Tensor) – Generated image.

  • pred_real (torch.Tensor) – Discriminator predictions for the real image.

  • pred_fake (torch.Tensor) – Discriminator predictions for the fake image.

Returns:

The computed generator loss.

Return type:

Tensor

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