add virchow2 model to registry

docs/user-guide/advanced/replicate_evaluations.md

@@ -204,6 +204,19 @@ IN_FEATURES=1024 \
 eva predict_fit --config configs/vision/pathology/offline/<task>.yaml
 ```
 
+### Virchow2 (paige.ai) - DINOv2 ViT-H14 (3.1M Slides) [[8]](#references)
+To evaluate [paige.ai's](https://www.paige.ai/) FM with DINOv2 ViT-H14 backbone, pretrained on
+a proprietary dataset of 3.1M million slides, available for download on
+[HuggingFace](https://huggingface.co/paige-ai/Virchow2), run:
+
+```
+MODEL_NAME=paige/virchow2 \
+NORMALIZE_MEAN="[0.485,0.456,0.406]" \
+NORMALIZE_STD="[0.229,0.224,0.225]" \
+IN_FEATURES=1280 \
+eva predict_fit --config configs/vision/pathology/offline/<task>.yaml
+```
+
 
 ## References
 
@@ -219,4 +232,6 @@ eva predict_fit --config configs/vision/pathology/offline/<task>.yaml
 
  [6]: Xu, Hanwen, et al. "A whole-slide foundation model for digital pathology from real-world data." Nature (2024): 1-8.
 
- [7]: Nechaev, Dmitry, Alexey Pchelnikov, and Ekaterina Ivanova. "Hibou: A Family of Foundational Vision Transformers for Pathology." arXiv preprint arXiv:2406.05074 (2024).
+ [7]: Nechaev, Dmitry, Alexey Pchelnikov, and Ekaterina Ivanova. "Hibou: A Family of Foundational Vision Transformers for Pathology." arXiv preprint arXiv:2406.05074 (2024).
+
+ [8]: Zimmermann, Eric, et al. "Virchow 2: Scaling Self-Supervised Mixed Magnification Models in Pathology." arXiv preprint arXiv:2408.00738 (2024).

src/eva/core/models/transforms/extract_cls_features.py

@@ -7,13 +7,20 @@
 class ExtractCLSFeatures:
     """Extracts the CLS token from a ViT model output."""
 
-    def __init__(self, cls_index: int = 0) -> None:
+    def __init__(
+        self, cls_index: int = 0, num_reg_tokens: int = 0, include_patch_tokens: bool = False
+    ) -> None:
         """Initializes the transformation.
 
         Args:
             cls_index: The index of the CLS token in the output tensor.
+            num_reg_tokens: The number of register tokens in the model output.
+            include_patch_tokens: Whether to concat the mean aggregated patch tokens with
+                the cls token.
         """
         self._cls_index = cls_index
+        self._num_reg_tokens = num_reg_tokens
+        self._include_patch_tokens = include_patch_tokens
 
     def __call__(
         self, tensor: torch.Tensor | modeling_outputs.BaseModelOutputWithPooling
@@ -23,11 +30,12 @@ def __call__(
         Args:
             tensor: The tensor representing the model output.
         """
-        if isinstance(tensor, torch.Tensor):
-            transformed_tensor = tensor[:, self._cls_index, :]
-        elif isinstance(tensor, modeling_outputs.BaseModelOutputWithPooling):
-            transformed_tensor = tensor.last_hidden_state[:, self._cls_index, :]
-        else:
-            raise ValueError(f"Unsupported type {type(tensor)}")
-
-        return transformed_tensor
+        if isinstance(tensor, modeling_outputs.BaseModelOutputWithPooling):
+            tensor = tensor.last_hidden_state
+
+        cls_token = tensor[:, self._cls_index, :]
+        if self._include_patch_tokens:
+            patch_tokens = tensor[:, 1 + self._num_reg_tokens :, :]
+            return torch.cat([cls_token, patch_tokens.mean(1)], dim=-1)
+
+        return cls_token

src/eva/core/models/transforms/extract_patch_features.py

@@ -10,13 +10,23 @@
 class ExtractPatchFeatures:
     """Extracts the patch features from a ViT model output."""
 
-    def __init__(self, ignore_remaining_dims: bool = False) -> None:
+    def __init__(
+        self,
+        has_cls_token: bool = True,
+        num_reg_tokens: int = 0,
+        ignore_remaining_dims: bool = False,
+    ) -> None:
         """Initializes the transformation.
 
         Args:
+            has_cls_token: If set to `True`, the model output is expected to have
+                a classification token.
+            num_reg_tokens: The number of register tokens in the model output.
             ignore_remaining_dims: If set to `True`, ignore the remaining dimensions
                 of the patch grid if it is not a square number.
         """
+        self._has_cls_token = has_cls_token
+        self._num_reg_tokens = num_reg_tokens
         self._ignore_remaining_dims = ignore_remaining_dims
 
     def __call__(
@@ -31,17 +41,19 @@ def __call__(
             A tensor (batch_size, hidden_size, n_patches_height, n_patches_width)
             representing the model output.
         """
+        num_skip = int(self._has_cls_token) + self._num_reg_tokens
         if isinstance(tensor, modeling_outputs.BaseModelOutputWithPooling):
-            features = tensor.last_hidden_state[:, 1:, :].permute(0, 2, 1)
-            batch_size, hidden_size, patch_grid = features.shape
-            height = width = int(math.sqrt(patch_grid))
-            if height * width != patch_grid:
-                if self._ignore_remaining_dims:
-                    features = features[:, :, -height * width :]
-                else:
-                    raise ValueError(f"Patch grid size must be a square number {patch_grid}.")
-            patch_embeddings = features.view(batch_size, hidden_size, height, width)
+            features = tensor.last_hidden_state[:, num_skip:, :].permute(0, 2, 1)
         else:
-            raise ValueError(f"Unsupported type {type(tensor)}")
+            features = tensor[:, num_skip:, :].permute(0, 2, 1)
+
+        batch_size, hidden_size, patch_grid = features.shape
+        height = width = int(math.sqrt(patch_grid))
+        if height * width != patch_grid:
+            if self._ignore_remaining_dims:
+                features = features[:, :, -height * width :]
+            else:
+                raise ValueError(f"Patch grid size must be a square number {patch_grid}.")
+        patch_embeddings = features.view(batch_size, hidden_size, height, width)
 
         return [patch_embeddings]

src/eva/vision/models/networks/backbones/_utils.py

@@ -1,7 +1,9 @@
 """Utilis for backbone networks."""
 
+import os
 from typing import Any, Dict, Tuple
 
+import huggingface_hub
 from torch import nn
 
 from eva import models
@@ -37,3 +39,13 @@ def load_hugingface_model(
         tensor_transforms=tensor_transforms,
         model_kwargs=model_kwargs,
     )
+
+
+def huggingface_login(hf_token: str | None = None):
+    token = hf_token or os.environ.get("HF_TOKEN")
+    if not token:
+        raise ValueError(
+            "Please provide a HuggingFace token to download the model. "
+            "You can either pass it as an argument or set the env variable HF_TOKEN."
+        )
+    huggingface_hub.login(token=token)

src/eva/vision/models/networks/backbones/pathology/__init__.py

@@ -13,6 +13,7 @@
 from eva.vision.models.networks.backbones.pathology.lunit import lunit_vits8, lunit_vits16
 from eva.vision.models.networks.backbones.pathology.mahmood import mahmood_uni
 from eva.vision.models.networks.backbones.pathology.owkin import owkin_phikon
+from eva.vision.models.networks.backbones.pathology.paige import paige_virchow2
 
 __all__ = [
     "kaiko_vitb16",
@@ -28,4 +29,5 @@
     "prov_gigapath",
     "histai_hibou_b",
     "histai_hibou_l",
+    "paige_virchow2",
 ]

src/eva/vision/models/networks/backbones/pathology/histai.py

@@ -23,7 +23,7 @@ def histai_hibou_b(out_indices: int | Tuple[int, ...] | None = None) -> nn.Modul
         model_name="histai/hibou-B",
         out_indices=out_indices,
         model_kwargs={"trust_remote_code": True},
-        transform_args={"ignore_remaining_dims": True} if out_indices is not None else None,
+        transform_args={"num_reg_tokens": 4} if out_indices is not None else None,
     )
 
 
@@ -42,5 +42,5 @@ def histai_hibou_l(out_indices: int | Tuple[int, ...] | None = None) -> nn.Modul
         model_name="histai/hibou-L",
         out_indices=out_indices,
         model_kwargs={"trust_remote_code": True},
-        transform_args={"ignore_remaining_dims": True} if out_indices is not None else None,
+        transform_args={"num_reg_tokens": 4} if out_indices is not None else None,
     )

src/eva/vision/models/networks/backbones/pathology/mahmood.py

@@ -9,6 +9,7 @@
 from torch import nn
 
 from eva.vision.models import wrappers
+from eva.vision.models.networks.backbones import _utils
 from eva.vision.models.networks.backbones.registry import register_model
 
 
@@ -31,19 +32,11 @@ def mahmood_uni(
     Returns:
         The model instance.
     """
-    token = hf_token or os.environ.get("HF_TOKEN")
-    if not token:
-        raise ValueError(
-            "Please provide a HuggingFace token to download the model. "
-            "You can either pass it as an argument or set the env variable HF_TOKEN."
-        )
-
     checkpoint_path = os.path.join(download_dir, "pytorch_model.bin")
-
     if not os.path.exists(checkpoint_path):
         logger.info(f"Downloading the model checkpoint to {download_dir} ...")
         os.makedirs(download_dir, exist_ok=True)
-        huggingface_hub.login(token=token)
+        _utils.huggingface_login(hf_token)
         huggingface_hub.hf_hub_download(
             "MahmoodLab/UNI",
             filename="pytorch_model.bin",

src/eva/vision/models/networks/backbones/pathology/paige.py

@@ -0,0 +1,51 @@
+"""Pathology FMs from paige.ai.
+
+Source: https://huggingface.co/paige-ai/
+"""
+
+from typing import Tuple
+
+import timm
+import torch.nn as nn
+
+from eva.core.models import transforms
+from eva.vision.models import wrappers
+from eva.vision.models.networks.backbones import _utils
+from eva.vision.models.networks.backbones.registry import register_model
+
+
+@register_model("paige/virchow2")
+def paige_virchow2(
+    dynamic_img_size: bool = True,
+    out_indices: int | Tuple[int, ...] | None = None,
+    hf_token: str | None = None,
+    include_patch_tokens: bool = False,
+) -> nn.Module:
+    """Initializes the Virchow2 pathology FM by paige.ai.
+
+    Args:
+        dynamic_img_size: Support different input image sizes by allowing to change
+            the grid size (interpolate abs and/or ROPE pos) in the forward pass.
+        out_indices: Whether and which multi-level patch embeddings to return.
+        include_patch_tokens: Whether to combine the mean aggregated patch tokens with cls token.
+        hf_token: HuggingFace token to download the model.
+
+    Returns:
+        The model instance.
+    """
+    _utils.huggingface_login(hf_token)
+    return wrappers.TimmModel(
+        model_name="hf-hub:paige-ai/Virchow2",
+        out_indices=out_indices,
+        pretrained=True,
+        model_kwargs={
+            "dynamic_img_size": dynamic_img_size,
+            "mlp_layer": timm.layers.SwiGLUPacked,
+            "act_layer": nn.SiLU,
+        },
+        tensor_transforms=(
+            transforms.ExtractCLSFeatures(include_patch_tokens=include_patch_tokens)
+            if out_indices is None
+            else None
+        ),
+    )

tests/eva/core/models/wrappers/test_huggingface.py

@@ -14,6 +14,11 @@
     [
         ("hf-internal-testing/tiny-random-ViTModel", None, (16, 226, 32)),
         ("hf-internal-testing/tiny-random-ViTModel", transforms.ExtractCLSFeatures(), (16, 32)),
+        (
+            "hf-internal-testing/tiny-random-ViTModel",
+            transforms.ExtractCLSFeatures(include_patch_tokens=True),
+            (16, 64),
+        ),
     ],
 )
 def test_huggingface_model(