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| title: SignBridge | |
| emoji: 🤟 | |
| colorFrom: indigo | |
| colorTo: pink | |
| sdk: gradio | |
| sdk_version: 4.44.1 | |
| app_file: app.py | |
| pinned: false | |
| thumbnail: assets/cover.png | |
| license: mit | |
| short_description: Real-time ASL → English speech on AMD MI300X. | |
| # SignBridge — real-time ASL → speech | |
| Two people who couldn't communicate, now can. | |
| A deaf person signs into the webcam. SignBridge — a multi-stage vision + reasoning + voice pipeline running on a single AMD Instinct MI300X — translates the signs into spoken English in under 2 seconds. | |
| Submission for the **AMD Developer Hackathon** (LabLab.ai, May 2026) — **Track 3: Vision & Multimodal AI**. | |
| ## How it works | |
| ``` | |
| webcam frames → MediaPipe Holistic → trained sign classifier | |
| (1–5 fps) (543-dim pose) (WLASL Top-100 + alphabet) | |
| │ | |
| ▼ | |
| Llama-3.1-8B sentence composer | |
| │ | |
| ▼ | |
| Coqui XTTS-v2 → speech | |
| ``` | |
| All four stages run **concurrently on a single AMD Instinct MI300X** via AMD Developer Cloud. Total weights ~22 GB on a 192 GB GPU — fits with margin for KV cache + serving overhead. | |
| ## V1 use cases | |
| 1. **ASL fingerspelling alphabet** — sign A–Z and 0–9 → AI speaks the letters / numbers | |
| 2. **Top-50 WLASL signs** (hello, thank you, name, please, sorry, family, eat, drink, work, …) → AI composes grammatical English sentences | |
| V1 is **one-way**: deaf signs → hearing hears. Reverse direction (speech → on-screen text) is V2. | |
| ## Why AMD | |
| The MI300X's 192 GB HBM3 fits the entire pipeline (Qwen3-VL-8B + Llama-3.1-8B + XTTS-v2) on one GPU with margin. NVIDIA H100 (80 GB) requires sharding, and the V2 plan to upgrade to a 70B reasoner is impossible on H100 without a 3-GPU cluster. Single-GPU concurrency + 5.3 TB/s memory bandwidth is the actual AMD pitch — practical accessibility tools running globally need the cost-and-availability profile that AMD enables. | |
| ## Why this matters (business case) | |
| Sign-language interpreters cost **$50–200 per hour** and are scarce. Courts, hospitals, schools, and public services **must by law** provide interpretation (ADA Title II/III in the US, EAA 2025 in the EU). Sorenson VRS — the dominant relay-services provider — books **$4B+ in annual revenue** in this space. SignBridge is the open-source backbone that any country, NGO, or enterprise can deploy on their own AMD compute. | |
| ## Privacy | |
| Session-only. Frames and audio are processed in-memory and not persisted server-side beyond the WebSocket / HTTP session. | |
| ## For Deaf-led teams | |
| SignBridge is open-source under MIT license and intentionally scoped to ASL-only V1. The pipeline is a substrate, not a finished product — Deaf-led organisations (schools-for-the-Deaf, NGOs, ministries) are the intended deployers. Other sign languages (BSL, MSL, CSL, ISL, +200 more) deserve their own teams, training data, and Deaf community leadership. See [`docs/walkthrough.md`](docs/walkthrough.md) → "Deployment ethics" for the design principles drawn from the Deaf-led academic literature. | |
| ## Local dev | |
| ```bash | |
| # Setup | |
| pip install -r requirements.txt | |
| cp .env.example .env # fill in HF_TOKEN, AMD_DEV_CLOUD_*, OPENAI_API_KEY (fallback) | |
| # Run the Gradio app | |
| python app.py | |
| # Run the inference backend (point at AMD Dev Cloud or local ROCm) | |
| python -m signbridge.backend | |
| # Train the classifier on WLASL Top-100 (Day 2 task — run on AMD Dev Cloud) | |
| python -m signbridge.scripts.train_classifier --dataset data/wlasl --epochs 30 | |
| ``` | |
| ## Datasets used | |
| - [WLASL](https://github.com/dxli94/WLASL) — Word-Level American Sign Language; we use the Top-100 subset | |
| - ASL fingerspelling alphabet (open dataset) | |
| ## Models pulled from Hugging Face Hub | |
| - `meta-llama/Llama-3.1-8B-Instruct` — sentence composer | |
| - `coqui/XTTS-v2` — text-to-speech | |
| - (V2 stretch) `openai/whisper-large-v3` — for the reverse direction | |
| ## License | |
| MIT. See [`LICENSE`](LICENSE). | |
| ## Status | |
| Active development — see `CLAUDE.md` for the working state and `docs/walkthrough.md` for the technical writeup. | |