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---
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##
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``
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--
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*
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*
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i---
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dataset_name: EgoHaFL
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pretty_name: EgoHaFL: Egocentric 3D Hand Forecasting Dataset with Language Instruction
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tags:
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- egocentric
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- 3d-hand
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- forecasting
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- hand-pose
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- video
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- language
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license: mit
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language:
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- en
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size_categories:
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- 200K<n<300K
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task_categories:
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- vision
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- natural-language-processing
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- 3d
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task_ids:
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- 3d-hand-pose-estimation
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- video-forecasting
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- video-language
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---
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# **EgoHaFL: Egocentric 3D Hand Forecasting Dataset with Language Instruction**
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**EgoHaFL** is a dataset designed for **egocentric (first-person) 3D hand forecasting** with accompanying **natural language instructions**.
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It contains short video clips, text descriptions, camera intrinsics, and detailed MANO-based 3D hand annotations.
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The dataset supports research in **3D hand forecasting**, **hand pose estimation**, **hand–object interaction understanding**, and **video–language modeling**.
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---
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## 📦 **Dataset Contents**
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### **1. Metadata CSV Files**
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* `EgoHaFL_train.csv`
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* `EgoHaFL_test.csv`
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Each row corresponds to one sample and contains:
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| Field | Description |
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| ---------------- | ------------------------------------------ |
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| `uid` | Unique sample identifier |
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| `video_id` | Source video identifier |
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| `start_second` | Start time of the clip (seconds) |
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| `end_second` | End time of the clip (seconds) |
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| `caption` | Natural language instruction / description |
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| `fx`, `fy` | Camera focal lengths |
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| `cx`, `cy` | Principal point |
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| `vid_w`, `vid_h` | Original video resolution |
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---
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### **2. 3D Hand Annotations (EgoHaFL_lmdb)**
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The folder `EgoHaFL_lmdb` stores all 3D annotations in **LMDB format**.
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* **Key**: `uid`
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* **Value**: a **list of length 16**, representing uniformly sampled frames across a **3-second video segment**.
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Each of the 16 elements is a dictionary containing:
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* `mano_params`
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* `global_orient (n, 1, 3 ,3)`
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* `hand_pose (n, 15, 3, 3)`
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* `betas (n, 10)`
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* `is_right (n,)`
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* `keypoints_3d (n, 21, 3)`
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* `keypoints_2d (n, 21, 2)`
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* `vertices (n, 778, 3)`
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* `box_center (n, 2)`
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* `box_size (n,)`
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* `camera_t (n, 3)`
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* `focal_length (n, 2)`
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---
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## 🌳 **Annotation Structure (Tree View)**
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Below is the hierarchical structure for a single annotation entry (`uid → 16-frame list → per-frame dict`):
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```
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<uid>
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└── list (length = 16)
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├── [0]
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│ ├── mano_params
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│ │ ├── global_orient
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│ │ ├── hand_pose
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│ │ └── betas
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│ ├── is_right
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│ ├── keypoints_3d
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│ ├── keypoints_2d
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│ ├── vertices
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│ ├── box_center
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│ ├── box_size
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│ ├── camera_t
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│ └── focal_length
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├── [1]
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│ └── ...
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├── [2]
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│ └── ...
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└── ...
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```
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---
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## 🎥 **Source of Video Data**
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The video clips used in **EgoHaFL** originate from the **Ego4D V1** dataset.
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For our experiments, we use the **original-length videos compressed to 224p resolution** to ensure efficient storage and training.
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Official Ego4D website:
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🔗 **[https://ego4d-data.org/](https://ego4d-data.org/)**
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---
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## 🧩 **Example of Use**
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For details on how to load and use the EgoHaFL dataset,
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please refer to the **dataloader implementation** in our GitHub repository:
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🔗 **[https://github.com/ut-vision/SFHand](https://github.com/ut-vision/SFHand)**
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---
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## 🧠 **Supported Research Tasks**
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* Egocentric 3D hand forecasting
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* Hand motion prediction and trajectory modeling
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* 3D hand pose estimation
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* Hand–object interaction understanding
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* Video–language multimodal modeling
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* Temporal reasoning with 3D human hands
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