Improve model card: Add pipeline tag, library name, paper abstract, and detailed usage

README.md

@@ -1,3 +1,148 @@
----
-license: mit
----
+---
+license: mit
+pipeline_tag: image-feature-extraction
+library_name: pytorch
+---
+
+# CoTAP: Semantic Concentration for Self-Supervised Dense Representations Learning
+
+This repository contains the official code for the paper [Semantic Concentration for Self-Supervised Dense Representations Learning](https://huggingface.co/papers/2509.09429), accepted by IEEE Transactions on Pattern Analysis and Machine Intelligence (TPAMI 2025).
+
+## Abstract
+Recent advances in image-level self-supervised learning (SSL) have made significant progress, yet learning dense representations for patches remains challenging. Mainstream methods encounter an over-dispersion phenomenon that patches from the same instance/category scatter, harming downstream performance on dense tasks. This work reveals that image-level SSL avoids over-dispersion by involving implicit semantic concentration. Specifically, the non-strict spatial alignment ensures intra-instance consistency, while shared patterns, i.e., similar parts of within-class instances in the input space, ensure inter-image consistency. Unfortunately, these approaches are infeasible for dense SSL due to their spatial sensitivity and complicated scene-centric data. These observations motivate us to explore explicit semantic concentration for dense SSL. First, to break the strict spatial alignment, we propose to distill the patch correspondences. Facing noisy and imbalanced pseudo labels, we propose a noise-tolerant ranking loss. The core idea is extending the Average Precision (AP) loss to continuous targets, such that its decision-agnostic and adaptive focusing properties prevent the student model from being misled. Second, to discriminate the shared patterns from complicated scenes, we propose the object-aware filter to map the output space to an object-based space. Specifically, patches are represented by learnable prototypes of objects via cross-attention. Last but not least, empirical studies across various tasks soundly support the effectiveness of our method. Code is available in this https URL .
+
+## GitHub Repository
+For more details, code, and training scripts, please visit the official GitHub repository: [https://github.com/KID-7391/CoTAP](https://github.com/KID-7391/CoTAP)
+
+![CoTAP Pipeline](https://github.com/KID-7391/CoTAP/raw/main/overview-v2.png)
+
+## 🚩 Checkpoints
+
+| Method | Backbone | Linear Seg (mIoU) | kNN Cls (Acc) | Linear Cls (Acc) | Download |
+| ------ | -------- | ----------------- | ------------- | ---------------- | -------- |
+| DINO+CoTAP    | VIT-S/16 | 50.5 | 78.0 | 79.1 | [link](https://huggingface.co/KID-7391/CoTAP/blob/main/checkpoints/ours/vits16/dino%2Bcotap.ckpt) |
+| Leopart+CoTAP | VIT-S/16 | 50.4 | 77.3 | 78.6 | [link](https://huggingface.co/KID-7391/CoTAP/blob/main/checkpoints/ours/vits16/leopart%2Bcotap.ckpt) |
+| iBOT+CoTAP    | VIT-S/16 | 51.6 | 78.4 | 79.4 | [link](https://huggingface.co/KID-7391/CoTAP/blob/main/checkpoints/ours/vits16/ibot%2Bcotap.ckpt) |
+| Mugs+CoTAP    | VIT-S/16 | 51.6 | 78.9 | 79.4 | [link](https://huggingface.co/KID-7391/CoTAP/blob/main/checkpoints/ours/vits16/mugs%2Bcotap.ckpt) |
+| DINO+CoTAP    | VIT-B/16 | 52.2 | 79.2 | 80.2 | [link](https://huggingface.co/KID-7391/CoTAP/blob/main/checkpoints/ours/vitb16/dino%2Bcotap.ckpt) |
+| iBOT+CoTAP    | VIT-B/16 | 53.9 | 80.1 | 80.8 | [link](https://huggingface.co/KID-7391/CoTAP/blob/main/checkpoints/ours/vitb16/ibot%2Bcotap.ckpt) |
+| Mugs+CoTAP    | VIT-B/16 | 52.1 | 80.8 | 81.7 | [link](https://huggingface.co/KID-7391/CoTAP/blob/main/checkpoints/ours/vitb16/mugs%2Bcotap.ckpt) |
+| DINO+CoTAP    | VIT-B/8  | 54.7 | 81.6 | 82.1 | [link](https://huggingface.co/KID-7391/CoTAP/blob/main/checkpoints/ours/vitb8/dino%2Bcotap.ckpt) |
+
+
+## 💻 Environments
+
+*   **Ubuntu** 20.04
+*   **CUDA** 11.6
+*   **Python** 3.9.13
+*   **Pytorch** 1.13.1
+
+See `requirement.txt` for others.
+
+## 🔧 Installation
+
+1.  Clone this repository
+
+    ```bash
+    git clone https://github.com/KID-7391/cotap.git
+    ```
+
+2.  Create a virtual environment with Python 3.9 and install the dependencies
+
+    ```bash
+    conda create --name CoTAP python=3.9
+    conda activate CoTAP
+    ```
+
+3.  Install the required libraries
+
+    ```bash
+    pip install -r requirements.txt
+    ```
+
+## 🚀 Training
+
+### Dataset
+
+1.  Download [ImageNet-1k](https://www.image-net.org/download.php), [COCO](https://cocodataset.org/#home), and [COCOStuff164k](https://www.robots.ox.ac.uk/~xuji/datasets/COCOStuff164kCurated.tar.gz).
+2.  Download [NNS](https://huggingface.co/KID-7391/CoTAP/blob/main/nns.zip) (indices of the nearest neighbors).
+3.  Place them in `data` with the following structure:
+    ```
+    CoTAP
+    └── data
+        ├── imagenet-1k
+        |   ├── train
+        |   |   ├── n01440764
+        |   |   │   │── n01440764_18.JPEG
+        |   |   │   └── ...
+        |   └── val
+        |       └── n01440764
+        |           ├── ILSVRC2012_val_00000293.JPEG
+        |           └── ...
+        ├── coco
+        |   ├── images
+        |   |   ├── train2017
+        |   |   │   ├── 000000000009.jpg
+        |   |   │   └── ...
+        |   |   └── val2017
+        |   |       ├── 000000000139.jpg
+        |   |       └── ...
+        |   ├── annotations
+        |   |   ├── train2017
+        |   |   │   ├── 000000000009.png
+        |   |   │   └── ...
+        |   |   └── val2017
+        |   |       ├── 000000000139.png
+        |   |       └── ...
+        |   └── curated
+        └── nns
+            ├── nns_vit_base_imagenet1k_train_None_224.npz
+            └── ...
+    ```
+
+### Initialization Checkpoints
+
+Download one of the following checkpoints for initialization. DINO checkpoints will be automatically downloaded.
+
+| Method | Backbone | Linear Seg (mIoU) | kNN Cls (Acc) | Linear Cls (Acc) | Download |
+| ------ | -------- | ----------------- | ------------- | ---------------- | -------- |
+| DINO    | VIT-S/16 | 38.8 | 74.5 | 77.0 | - |
+| Leopart | VIT-S/16 | 47.2 | 55.0 | 70.0 | [link](https://huggingface.co/KID-7391/CoTAP/blob/main/checkpoints/competitor/vits16/leopart.ckpt) |
+| iBOT    | VIT-S/16 | 45.8 | 75.2 | 77.9 | [link](https://huggingface.co/KID-7391/CoTAP/blob/main/checkpoints/competitor/vits16/ibot.ckpt) |
+| Mugs    | VIT-S/16 | 47.5 | 75.6 | 78.9 | [link](https://huggingface.co/KID-7391/CoTAP/blob/main/checkpoints/competitor/vits16/mugs.ckpt) |
+| DINO    | VIT-B/16 | 44.0 | 76.1 | 78.2 | - |
+| iBOT    | VIT-B/16 | 49.6 | 77.1 | 79.5 | [link](https://huggingface.co/KID-7391/CoTAP/blob/main/checkpoints/competitor/vitb16/ibot.ckpt) |
+| Mugs    | VIT-B/16 | 49.6 | 78.0 | 80.6 | [link](https://huggingface.co/KID-7391/CoTAP/blob/main/checkpoints/competitor/vitb16/mugs.ckpt) |
+| DINO    | VIT-B/8  | 45.9 | 77.4 | 80.1 | - |
+
+
+### Scripts
+
+See `configs` and `scripts` for default hyperparameters. Run the following command for training.
+
+```bash
+bash scripts/run_[backbone]_[init_method].sh
+```
+
+For examples:
+```bash
+bash scripts/run_vits16_dino.sh
+```
+
+## 📊 Evaluation
+
+1.  Download the test datasets and place them into `data`: [COCOStuff27](https://www.robots.ox.ac.uk/~xuji/datasets/COCOStuff164kCurated.tar.gz), [PASCAL-VOC](http://host.robots.ox.ac.uk/pascal/VOC/), [ADE20k](https://github.com/CSAILVision/ADE20K?utm_source=chatgpt.com), and [Cityscapes](https://www.cityscapes-dataset.com/?utm_source=chatgpt.com).
+2.  Modify `evaluate_group` in `scripts/test_seg.sh` to choose test settings; modify `model` in `scripts/test_seg.sh` and `scripts/test_in1k_knn.sh` to setup model paths.
+3.  Run the following command for kNN classification and semantic segmentation:
+    ```bash
+    bash scripts/test_in1k_knn.sh
+    bash scripts/test_seg.sh
+    ```
+
+## 📧 Contact us
+
+If you have any detailed questions or suggestions, you can email us: wenpeisong@ucas.ac.cn. We will reply in 1-2 business days. Thanks for your interest in our work!
+
+## 🌟 Acknowledgements
+
+Our code is based on the official PyTorch implementation of [DINO](https://github.com/facebookresearch/dino), [Leopart](https://github.com/MkuuWaUjinga/leopart), and [STEGO](https://github.com/mhamilton723/STEGO).