🔨 Scaffold for refactor

pyproject.toml

@@ -56,6 +56,7 @@ core = [
     "open-clip-torch>=2.23.0,<2.26.1",
 ]
 openvino = ["openvino>=2024.0", "nncf>=2.10.0", "onnx>=1.16.0"]
+vlm = ["ollama", "transformers"]
 loggers = [
     "comet-ml>=3.31.7",
     "gradio>=4",
@@ -84,7 +85,7 @@ test = [
     "coverage[toml]",
     "tox",
 ]
-full = ["anomalib[core,openvino,loggers,notebooks]"]
+full = ["anomalib[core,openvino,loggers,notebooks, vlm]"]
 dev = ["anomalib[full,docs,test]"]
 
 [project.scripts]

src/anomalib/models/__init__.py

@@ -34,6 +34,7 @@
     Rkde,
     Stfpm,
     Uflow,
+    Vlm,
     WinClip,
 )
 from .video import AiVad
@@ -62,6 +63,7 @@ class UnknownModelError(ModuleNotFoundError):
     "Stfpm",
     "Uflow",
     "AiVad",
+    "Vlm",
     "WinClip",
     "Llm",
     "Llmollama",

src/anomalib/models/image/__init__.py

@@ -24,6 +24,7 @@
 from .rkde import Rkde
 from .stfpm import Stfpm
 from .uflow import Uflow
+from .vlm import Vlm
 from .winclip import WinClip
 
 __all__ = [
@@ -44,6 +45,7 @@
     "Rkde",
     "Stfpm",
     "Uflow",
+    "Vlm",
     "WinClip",
     "Llm",
     "Llmollama",

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

@@ -0,0 +1,8 @@
+"""Visual Anomaly Model."""
+
+# Copyright (C) 2024 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+from .lightning_model import Vlm
+
+__all__ = ["Vlm"]

src/anomalib/models/image/vlm/backends/__init__.py

@@ -0,0 +1,9 @@
+"""VLM backends."""
+
+# Copyright (C) 2024 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+from .base import Backend
+from .ollama import Ollama
+
+__all__ = ["Backend", "Ollama"]

src/anomalib/models/image/vlm/backends/base.py

@@ -0,0 +1,23 @@
+"""Base backend."""
+
+# Copyright (C) 2024 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+from abc import ABC, abstractmethod
+from pathlib import Path
+
+
+class Backend(ABC):
+    """Base backend."""
+
+    @abstractmethod
+    def __init__(self, api_key: str | None = None) -> None:
+        """Initialize the backend."""
+
+    @abstractmethod
+    def add_reference_images(self, image: str | Path) -> None:
+        """Add reference images for k-shot."""
+
+    @abstractmethod
+    def predict(self, image: str | Path) -> str:
+        """Predict the anomaly label."""

src/anomalib/models/image/vlm/backends/ollama.py

@@ -0,0 +1,89 @@
+"""Ollama backend.
+
+Assumes that the Ollama service is running in the background.
+See: https://github.com/ollama/ollama
+Ensure that ollama is running. On linux: `ollama serve`
+"""
+
+# Copyright (C) 2024 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+import logging
+from dataclasses import dataclass
+from pathlib import Path
+
+from anomalib.utils.exceptions import try_import
+
+from .base import Backend
+
+if try_import("ollama"):
+    from ollama import chat
+    from ollama._client import _encode_image
+else:
+    chat = None
+
+logger = logging.getLogger(__name__)
+
+
+@dataclass
+class Prompt:
+    """Ollama prompt."""
+
+    few_shot: str
+    predict: str
+
+
+class Ollama(Backend):
+    """Ollama backend."""
+
+    def __init__(self, api_key: str | None = None, model_name: str = "llava") -> None:
+        """Initialize the Ollama backend."""
+        if api_key:
+            logger.warning("API key is not required for Ollama backend.")
+        self.model_name: str = model_name
+        self._ref_images_encoded: list[str] = []
+
+    def add_reference_images(self, image: str | Path) -> None:
+        """Encode the image to base64."""
+        self._ref_images_encoded.append(_encode_image(image))
+
+    @property
+    def prompt(self) -> Prompt:
+        """Get the Ollama prompt."""
+        return Prompt(
+            predict=(
+                "You are given an image. It is either normal or anomalous."
+                "First say 'YES' if the image is anomalous, or 'NO' if it is normal.\n"
+                "Then give the reason for your decision.\n"
+                "For example, 'YES: The image has a crack on the wall.'"
+            ),
+            few_shot=(
+                "These are a few examples of normal picture without any anomalies."
+                " You have to use these to determine if the image I provide in the next"
+                " chat is normal or anomalous."
+            ),
+        )
+
+    def predict(self, image: str | Path) -> str:
+        """Predict the anomaly label."""
+        if not chat:
+            msg = "Ollama is not installed. Please install it using `pip install ollama`."
+            raise ImportError(msg)
+        image_encoded = _encode_image(image)
+        messages = []
+
+        # few-shot
+        if len(self._ref_images_encoded) > 0:
+            messages.append({
+                "role": "user",
+                "images": self._ref_images_encoded,
+                "content": self.prompt.few_shot,
+            })
+
+        messages.append({"role": "user", "images": [image_encoded], "content": self.prompt.predict})
+
+        response = chat(
+            model=self.model_name,
+            messages=messages,
+        )
+        return response["message"]["content"].strip()

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

@@ -0,0 +1,82 @@
+"""Visual Anomaly Model for Zero/Few-Shot Anomaly Classification."""
+
+# Copyright (C) 2024 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+import logging
+from enum import Enum
+
+import torch
+from torch.utils.data import DataLoader
+
+from anomalib import LearningType
+from anomalib.models import AnomalyModule
+
+from .backends import Backend, Ollama
+
+logger = logging.getLogger(__name__)
+
+
+class VLMBackend(Enum):
+    """Supported VLM backends."""
+
+    OLLAMA = "ollama"
+
+
+class Vlm(AnomalyModule):
+    """Visual anomaly model."""
+
+    def __init__(self, backend: VLMBackend = VLMBackend.OLLAMA, api_key: str | None = None, k_shot: int = 3) -> None:
+        super().__init__()
+        self.k_shot = k_shot
+        self.vlm_backend: Backend = self._setup_vlm(backend, api_key)
+
+    @staticmethod
+    def _setup_vlm(backend: VLMBackend, api_key: str | None) -> Backend:
+        match backend:
+            case VLMBackend.OLLAMA:
+                return Ollama()
+            case _:
+                msg = f"Unsupported VLM backend: {backend}"
+                raise ValueError(msg)
+
+    def _setup(self) -> None:
+        if self.k_shot:
+            logger.info("Collecting reference images from training dataset.")
+            dataloader = self.trainer.datamodule.train_dataloader()
+            self.collect_reference_images(dataloader)
+
+    def collect_reference_images(self, dataloader: DataLoader) -> None:
+        """Collect reference images for few-shot inference."""
+        count = 0
+        for batch in dataloader:
+            for img_path in batch["image_path"]:
+                self.vlm_backend.add_reference_images(img_path)
+                count += 1
+                if count == self.k_shot:
+                    return
+
+    def validation_step(self, batch: dict[str, str | torch.Tensor], *args, **kwargs) -> dict:
+        """Validation step."""
+        del args, kwargs  # These variables are not used.
+        responses = [(self.vlm_backend.predict(img_path)) for img_path in batch["image_path"]]
+
+        batch["str_output"] = responses
+        batch["pred_scores"] = torch.tensor([1.0 if r.startswith("Y") else 0.0 for r in responses], device=self.device)
+        return batch
+
+    @property
+    def learning_type(self) -> LearningType:
+        """The learning type of the model."""
+        return LearningType.ZERO_SHOT if self.k_shot == 0 else LearningType.FEW_SHOT
+
+    @property
+    def trainer_arguments(self) -> dict[str, int | float]:
+        """Doesn't need training."""
+        return {}
+
+    @staticmethod
+    def configure_transforms(image_size: tuple[int, int] | None = None) -> None:
+        """This modes does not require any transforms."""
+        if image_size is not None:
+            logger.warning("Ignoring image_size argument as each backend has its own transforms.")