🚀 feat(model): add GLASS model into Anomalib

src/anomalib/models/__init__.py

@@ -66,6 +66,7 @@
     Fastflow,
     Fre,
     Ganomaly,
+    Glass,
     Padim,
     Patchcore,
     ReverseDistillation,
@@ -102,6 +103,7 @@ class UnknownModelError(ModuleNotFoundError):
     "Fastflow",
     "Fre",
     "Ganomaly",
+    "Glass",
     "Padim",
     "Patchcore",
     "ReverseDistillation",

src/anomalib/models/image/__init__.py

@@ -55,6 +55,7 @@
 from .fastflow import Fastflow
 from .fre import Fre
 from .ganomaly import Ganomaly
+from .glass import Glass
 from .padim import Padim
 from .patchcore import Patchcore
 from .reverse_distillation import ReverseDistillation
@@ -76,6 +77,7 @@
     "Fastflow",
     "Fre",
     "Ganomaly",
+    "Glass",
     "Padim",
     "Patchcore",
     "ReverseDistillation",

src/anomalib/models/image/glass/__init__.py

@@ -0,0 +1,23 @@
+# Copyright (C) 2025 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+"""GLASS - Unsupervised anomaly detection via Gradient Ascent for Industrial Anomaly detection and localization.
+
+This module implements the GLASS model for unsupervised anomaly detection and localization. GLASS synthesizes both
+global and local anomalies using Gaussian noise guided by gradient ascent to enhance weak defect detection in
+industrial settings.
+
+The model consists of:
+    - A feature extractor and feature adaptor to obtain robust normal representations
+    - A Global Anomaly Synthesis (GAS) module that perturbs features using Gaussian noise and gradient ascent with
+      truncated projection
+    - A Local Anomaly Synthesis (LAS) module that overlays augmented textures onto images using Perlin noise masks
+    - A shared discriminator trained with features from normal, global, and local synthetic samples
+
+Paper: `A Unified Anomaly Synthesis Strategy with Gradient Ascent for Industrial Anomaly Detection and Localization
+<https://arxiv.org/pdf/2407.09359>`
+"""
+
+from .lightning_model import Glass
+
+__all__ = ["Glass"]

src/anomalib/models/image/glass/lightning_model.py

@@ -0,0 +1,326 @@
+# Copyright (C) 2025 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+"""GLASS - Unsupervised anomaly detection via Gradient Ascent for Industrial Anomaly detection and localization.
+
+This module implements the GLASS model for unsupervised anomaly detection and localization. GLASS synthesizes both
+global and local anomalies using Gaussian noise guided by gradient ascent to enhance weak defect detection in
+industrial settings.
+
+The model consists of:
+    - A feature extractor and feature adaptor to obtain robust normal representations
+    - A Global Anomaly Synthesis (GAS) module that perturbs features using Gaussian noise and gradient ascent with
+      truncated projection
+    - A Local Anomaly Synthesis (LAS) module that overlays augmented textures onto images using Perlin noise masks
+    - A shared discriminator trained with features from normal, global, and local synthetic samples
+
+Paper: `A Unified Anomaly Synthesis Strategy with Gradient Ascent for Industrial Anomaly Detection and Localization
+<https://arxiv.org/pdf/2407.09359>`
+"""
+
+from typing import Any
+
+from lightning.pytorch.utilities.types import STEP_OUTPUT
+from torch import optim
+from torchvision.transforms.v2 import CenterCrop, Compose, Normalize, Resize
+
+from anomalib import LearningType
+from anomalib.data import Batch
+from anomalib.metrics import Evaluator
+from anomalib.models.components import AnomalibModule
+from anomalib.post_processing import PostProcessor
+from anomalib.pre_processing import PreProcessor
+from anomalib.visualization import Visualizer
+
+from .torch_model import GlassModel
+
+
+class Glass(AnomalibModule):
+    """PyTorch Lightning Implementation of the GLASS Model.
+
+    The model uses a pre-trained feature extractor to extract features and a feature adaptor to mitigate latent domain
+      bias.
+    Global anomaly features are synthesized from adapted normal features using gradient ascent.
+    Local anomaly images are synthesized using texture overlay datasets like dtd which are then processed by feature
+      extractor and feature adaptor.
+    All three different features are passed to the discriminator trained using loss functions.
+
+    Args:
+        input_shape (tuple[int, int]): Input image dimensions as a tuple of (height, width). Required for shaping the
+          input pipeline.
+        anomaly_source_path (str): Path to the dataset or source directory containing normal images and anomaly textures
+        backbone (str, optional): Name of the CNN backbone used for feature extraction.
+            Defaults to `"resnet18"`.
+        pretrain_embed_dim (int, optional): Dimensionality of features extracted by the pre-trained backbone before
+          adaptation.
+            Defaults to `1024`.
+        target_embed_dim (int, optional): Dimensionality of the target adapted features after projection.
+            Defaults to `1024`.
+        patchsize (int, optional): Size of the local patch used in feature aggregation (e.g., for neighborhood pooling).
+            Defaults to `3`.
+        patchstride (int, optional): Stride used when extracting patches for local feature aggregation.
+            Defaults to `1`.
+        pre_trained (bool, optional): Whether to use ImageNet pre-trained weights for the backbone network.
+            Defaults to `True`.
+        layers (list[str], optional): List of backbone layers to extract features from.
+            Defaults to `["layer1", "layer2", "layer3"]`.
+        pre_projection (int, optional): Number of projection layers used in the feature adaptor (e.g., MLP before
+          discriminator).
+            Defaults to `1`.
+        discriminator_layers (int, optional): Number of layers in the discriminator network.
+            Defaults to `2`.
+        discriminator_hidden (int, optional): Number of hidden units in each discriminator layer.
+            Defaults to `1024`.
+        discriminator_margin (float, optional): Margin used for contrastive or binary classification loss in
+          discriminator training.
+            Defaults to `0.5`.
+        pre_processor (PreProcessor | bool, optional): reprocessing module or flag to enable default preprocessing.
+            Set to `True` to apply default normalization and resizing.
+            Defaults to `True`.
+        post_processor (PostProcessor | bool, optional): Postprocessing module or flag to enable default output
+          smoothing or thresholding.
+            Defaults to `True`.
+        evaluator (Evaluator | bool, optional): Evaluation module for calculating metrics such as AUROC and PRO.
+            Defaults to `True`.
+        visualizer (Visualizer | bool, optional): Visualization module to generate heatmaps, segmentation overlays, and
+          anomaly scores.
+            Defaults to `True`.
+        mining (int, optional): Number of iterations or difficulty level for Online Hard Example Mining (OHEM) during
+          training.
+            Defaults to `1`.
+        noise (float, optional): Standard deviation of Gaussian noise used in feature-level anomaly synthesis.
+            Defaults to `0.015`.
+        radius (float, optional): Radius parameter used for truncated projection in the anomaly synthesis strategy.
+            Determines the range for valid synthetic anomalies in the hypersphere or manifold.
+            Defaults to `0.75`.
+        random_selection_prob (float, optional): Probability used in random selection logic, such as anomaly mask
+          generation or augmentation choice.
+            Defaults to `0.5`.
+        learning_rate (float, optional): Learning rate for training the feature adaptor and discriminator networks.
+            Defaults to `0.0001`.
+        step (int, optional): Number of gradient ascent steps for anomaly synthesis.
+            Defaults to `20`.
+        svd (int, optional): Flag to enable SVD-based feature projection.
+            Defaults to `0`.
+    """
+
+    def __init__(
+        self,
+        input_shape: tuple[int, int] = (256, 256),
+        anomaly_source_path: str | None = None,
+        backbone: str = "resnet18",
+        pretrain_embed_dim: int = 1024,
+        target_embed_dim: int = 1024,
+        patchsize: int = 3,
+        patchstride: int = 1,
+        pre_trained: bool = True,
+        layers: list[str] | None = None,
+        pre_projection: int = 1,
+        discriminator_layers: int = 2,
+        discriminator_hidden: int = 1024,
+        discriminator_margin: float = 0.5,
+        pre_processor: PreProcessor | bool = True,
+        post_processor: PostProcessor | bool = True,
+        evaluator: Evaluator | bool = True,
+        visualizer: Visualizer | bool = True,
+        mining: int = 1,
+        noise: float = 0.015,
+        radius: float = 0.75,
+        random_selection_prob: float = 0.5,
+        learning_rate: float = 0.0001,
+        step: int = 20,
+        svd: int = 0,
+    ) -> None:
+        super().__init__(
+            pre_processor=pre_processor,
+            post_processor=post_processor,
+            evaluator=evaluator,
+            visualizer=visualizer,
+        )
+
+        if layers is None:
+            layers = ["layer1", "layer2", "layer3"]
+
+        self.model = GlassModel(
+            input_shape=input_shape,
+            anomaly_source_path=anomaly_source_path,
+            pretrain_embed_dim=pretrain_embed_dim,
+            target_embed_dim=target_embed_dim,
+            backbone=backbone,
+            pre_trained=pre_trained,
+            patchsize=patchsize,
+            patchstride=patchstride,
+            layers=layers,
+            pre_projection=pre_projection,
+            discriminator_layers=discriminator_layers,
+            discriminator_hidden=discriminator_hidden,
+            discriminator_margin=discriminator_margin,
+            step=step,
+            svd=svd,
+            mining=mining,
+            noise=noise,
+            radius=radius,
+            random_selection_prob=random_selection_prob,
+        )
+
+        self.learning_rate = learning_rate
+
+        if pre_projection > 0:
+            self.projection_opt = optim.AdamW(
+                self.model.projection.parameters(),
+                self.learning_rate,
+                weight_decay=1e-5,
+            )
+        else:
+            self.projection_opt = None
+
+        if not pre_trained:
+            self.backbone_opt = optim.AdamW(
+                self.model.forward_modules["feature_aggregator"].backbone.parameters(),
+                self.learning_rate,
+            )
+        else:
+            self.backbone_opt = None
+
+    @classmethod
+    def configure_pre_processor(
+        cls,
+        image_size: tuple[int, int] | None = None,
+        center_crop_size: tuple[int, int] | None = None,
+    ) -> PreProcessor:
+        """Configure the default pre-processor for GLASS.
+
+        If valid center_crop_size is provided, the pre-processor will
+        also perform center cropping, according to the paper.
+
+        Args:
+            image_size (tuple[int, int] | None, optional): Target size for
+                resizing. Defaults to ``(256, 256)``.
+            center_crop_size (tuple[int, int] | None, optional): Size for center
+                cropping. Defaults to ``None``.
+
+        Returns:
+            PreProcessor: Configured pre-processor instance.
+
+        Raises:
+            ValueError: If at least one dimension of ``center_crop_size`` is larger
+                than correspondent ``image_size`` dimension.
+
+        Example:
+            >>> pre_processor = Glass.configure_pre_processor(
+            ...     image_size=(256, 256)
+            ... )
+            >>> transformed_image = pre_processor(image)
+        """
+        image_size = image_size or (256, 256)
+
+        if center_crop_size is not None:
+            if center_crop_size[0] > image_size[0] or center_crop_size[1] > image_size[1]:
+                msg = f"Center crop size {center_crop_size} cannot be larger than image size {image_size}."
+                raise ValueError(msg)
+            transform = Compose([
+                Resize(image_size, antialias=True),
+                CenterCrop(center_crop_size),
+                Normalize(mean=[0.485, 0.456, 0.406], std=[0.229, 0.224, 0.225]),
+            ])
+        else:
+            transform = Compose([
+                Resize(image_size, antialias=True),
+                Normalize(mean=[0.485, 0.456, 0.406], std=[0.229, 0.224, 0.225]),
+            ])
+
+        return PreProcessor(transform=transform)
+
+    def configure_optimizers(self) -> optim.Optimizer:
+        """Configure optimizer for the discriminator.
+
+        Returns:
+            Optimizer: AdamW Optimizer for the discriminator.
+        """
+        return optim.AdamW(self.model.discriminator.parameters(), lr=self.learning_rate * 2)
+
+    def training_step(self, batch: Batch, batch_idx: int) -> STEP_OUTPUT:
+        """Training step for GLASS model.
+
+        Args:
+            batch (Batch): Input batch containing images and metadata
+            batch_idx (int): Index of the current batch
+
+        Returns:
+            STEP_OUTPUT: Dictionary containing loss values and metrics
+        """
+        del batch_idx
+        discriminator_opt = self.optimizers()
+
+        self.model.forward_modules.eval()
+        if self.model.pre_projection > 0:
+            self.model.projection.train()
+        self.model.discriminator.train()
+
+        discriminator_opt.zero_grad()
+        if self.projection_opt is not None:
+            self.projection_opt.zero_grad()
+        if self.backbone_opt is not None:
+            self.backbone_opt.zero_grad()
+
+        true_loss, gaus_loss, bce_loss, focal_loss, loss = self.model(batch.image)
+        loss.backward()
+
+        if self.projection_opt is not None:
+            self.projection_opt.step()
+        if self.backbone_opt is not None:
+            self.backbone_opt.step()
+        discriminator_opt.step()
+
+        self.log("true_loss", true_loss, prog_bar=True)
+        self.log("gaus_loss", gaus_loss, prog_bar=True)
+        self.log("bce_loss", bce_loss, prog_bar=True)
+        self.log("focal_loss", focal_loss, prog_bar=True)
+        self.log("loss", loss, prog_bar=True)
+
+    def validation_step(self, batch: Batch, batch_idx: int) -> STEP_OUTPUT:
+        """Performs a single validation step during model evaluation.
+
+        Args:
+            batch (Batch): A batch of input data, typically containing images and ground truth labels.
+            batch_idx (int): Index of the batch (unused in this function).
+
+        Returns:
+            STEP_OUTPUT: Output of the validation step, usually containing predictions and any associated metrics.
+        """
+        del batch_idx
+        self.model.forward_modules.eval()
+
+        if self.model.pre_projection > 0:
+            self.model.projection.eval()
+        self.model.discriminator.eval()
+
+        predictions = self.model(batch.image)
+        return batch.update(**predictions._asdict())
+
+    def on_train_start(self) -> None:
+        """Initialize model by computing mean feature representation across training dataset.
+
+        This method is called at the start of training and computes a mean feature vector
+        that serves as a reference point for the normal class distribution.
+        """
+        dataloader = self.trainer.train_dataloader
+        self.model.calculate_center(dataloader, self.device)
+
+    @property
+    def learning_type(self) -> LearningType:
+        """Return the learning type of the model.
+
+        Returns:
+            LearningType: Learning type (ONE_CLASS for GLASS)
+        """
+        return LearningType.ONE_CLASS
+
+    @property
+    def trainer_arguments(self) -> dict[str, Any]:
+        """Return GLASS trainer arguments.
+
+        Returns:
+            dict[str, Any]: Dictionary containing trainer configuration
+        """
+        return {"gradient_clip_val": 0, "num_sanity_val_steps": 0}