---
title: OvisOCR2
emoji: 🔎
colorFrom: blue
colorTo: gray
sdk: gradio
sdk_version: 6.20.0
python_version: "3.12.12"
app_file: app.py
pinned: false
license: apache-2.0
hardware: zero-gpu
startup_duration_timeout: 30m
models:
  - ATH-MaaS/OvisOCR2
preload_from_hub:
  - ATH-MaaS/OvisOCR2
short_description: Stream structured Markdown from document images and PDFs.
---

# OvisOCR2 — document OCR demo

A focused image and PDF document parsing demo for
[ATH-MaaS/OvisOCR2](https://huggingface.co/ATH-MaaS/OvisOCR2). It preserves
reading order and emits Markdown with LaTeX formulas, HTML tables, and rendered
visual-region crops. Model tokens stream into the interface as they are generated.
PDFs are rasterized locally and processed one page at a time in Base mode. Up to
four pages share one streamed GPU request by default, while each page is still
inferred independently and sequentially. The browser merges the results, so long
documents do not have to fit inside one ZeroGPU lease. GPU duration is estimated
from the number of pages that actually remain in each group, so a short second
group does not reserve the same ZeroGPU quota as a four-page group. If a Gradio
stream closes without an explicit backend error, the browser reconnects from the
first unfinished page while retaining every completed page. This demo
intentionally does not expose a separate Long mode.

The five packaged examples cover two financial tables, two Chinese handwriting
pages, and one formula-rich OmniDocBench research-paper page. They are selectable
directly in the interface and are also covered by the local smoke-test workflow.
The workspace opens empty so examples remain an explicit user choice rather than
an automatic input.

## Local run

The verified local model directory is `/root/models/ATH-MaaS/OvisOCR2`.

```bash
conda env create -f environment.yml
conda activate ovisocr2-demo
npm ci
npm run build
CUDA_VISIBLE_DEVICES=0 \
OVISOCR_MODEL_PATH=/root/models/ATH-MaaS/OvisOCR2 \
python app.py
```

Open `http://127.0.0.1:7860`.

### DSW proxy

The server already listens on `0.0.0.0`. Set a DSW id and the public proxy URL
is generated from the same `PORT` automatically:

```bash
CUDA_VISIBLE_DEVICES=0 \
PORT=7869 \
OVISOCR_DSW_ID=1976932 \
OVISOCR_MODEL_PATH=/root/models/ATH-MaaS/OvisOCR2 \
python app.py
```

The corresponding URL is
`https://1976932-proxy-7869.dsw-gateway-cn-hangzhou.data.aliyun.com/`.
For a different gateway or an explicit public URL, set `OVISOCR_ROOT_PATH`
instead; it takes precedence over `OVISOCR_DSW_ID`.

DSW's per-port proxy uses its own hostname and serves at `/`, so the ASGI root
path stays empty. If an explicit URL contains a real subpath, such as
`https://example.test/ocr/`, the app passes only `/ocr` to Gradio's `root_path`;
passing the whole URL into this custom FastAPI server would break static mounts.

For a UI-only smoke that does not load the model:

```bash
OVISOCR_TEST_MODE=1 python app.py
```

## Hugging Face Space

The checked-in `dist/` directory is the production frontend, so the folder can
be uploaded directly to a Gradio Space without a Node build step. Select
ZeroGPU hardware in the Space settings. The README metadata pins Python 3.12.12
and Gradio 6.20.0
and declares `hardware: zero-gpu`; `app.py` decorates only the inference endpoint
with `@spaces.GPU` and loads the model on CUDA at module scope, following the
ZeroGPU loading contract.

On Hugging Face, the model source automatically falls back from the local path
to `ATH-MaaS/OvisOCR2`. PDFs are limited to 50 pages by default. Groups of up to
four pages share a ZeroGPU reservation while the frontend preserves already
completed pages.

## Runtime knobs

- `OVISOCR_MODEL_PATH`: local directory or Hub model id.
- `OVISOCR_MAX_NEW_TOKENS`: defaults to `16384`, matching the model README inference configuration.
- `OVISOCR_MAX_PDF_PAGES`: defaults to `50`.
- `OVISOCR_PAGES_PER_GPU_REQUEST`: defaults to `4` and is capped at `5`.
- `OVISOCR_PDF_RENDER_SCALE`: PDF rasterization scale, defaults to `2.0`.
- `OVISOCR_STREAM_MIN_CHARS`: minimum new characters between stream updates, defaults to `64`.
- `OVISOCR_STREAM_MAX_INTERVAL`: maximum seconds between available stream updates, defaults to `0.25`.
- `OVISOCR_GPU_SECONDS_PER_PAGE`: duration-estimation budget, defaults to `30` seconds per page.
- `OVISOCR_GPU_DURATION_FLOOR`: minimum per-group ZeroGPU reservation, defaults to `45` seconds.
- `OVISOCR_GPU_DURATION_CEILING`: maximum estimated per-group reservation, defaults to `120` seconds.
- `OVISOCR_GPU_DURATION`: optional fixed per-group override; unset by default so dynamic duration is used.
- `OVISOCR_ATTN_IMPLEMENTATION`: defaults to `sdpa`.
- `OVISOCR_DSW_ID`: generates the Hangzhou DSW proxy root using the active `PORT`.
- `OVISOCR_ROOT_PATH`: explicit proxy URL or ASGI path prefix; overrides `OVISOCR_DSW_ID`.
- `OVISOCR_TEST_MODE=1`: deterministic mock inference for UI/integration tests.