Datasets:
Duplicate from nvidia/OCR-Synthetic-Multilingual-v1
Browse filesCo-authored-by: Ryan Chesler <emelryan@users.noreply.huggingface.co>
This view is limited to 50 files because it contains too many changes. See raw diff
- .gitattributes +60 -0
- README.md +234 -0
- en/test/test_000.h5 +3 -0
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| 1 |
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---
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| 2 |
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license: cc-by-4.0
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| 3 |
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task_categories:
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| 4 |
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- object-detection
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| 5 |
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- image-to-text
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| 6 |
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language:
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| 7 |
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- en
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| 8 |
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- ja
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| 9 |
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- ko
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| 10 |
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- ru
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| 11 |
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- zh
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| 12 |
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tags:
|
| 13 |
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- ocr
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| 14 |
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- text-detection
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| 15 |
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- text-recognition
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| 16 |
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- synthetic-data
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| 17 |
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- synthdog
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| 18 |
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- hdf5
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| 19 |
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- nvidia
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| 20 |
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- nemotron
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| 21 |
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pretty_name: OCR Synthetic Multilingual v1
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| 22 |
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size_categories:
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| 23 |
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- 10M<n<100M
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| 24 |
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---
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| 25 |
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| 26 |
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# OCR-Synthetic-Multilingual-v1
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| 27 |
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| 28 |
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## Overview
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| 29 |
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| 30 |
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Large-scale synthetically generated OCR training dataset for multilingual text detection and recognition. The data was produced using a heavily modified and extended version of [SynthDoG](https://github.com/clovaai/donut/tree/master/synthdog) (Synthetic Document Generator), originally introduced in the [Donut](https://github.com/clovaai/donut) project by Kim et al.
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| 31 |
+
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| 32 |
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This dataset was used to train [**Nemotron OCR v2**](https://huggingface.co/nvidia/nemotron-ocr-v2), a state-of-the-art multilingual OCR model that is part of the [NVIDIA NeMo Retriever](https://developer.nvidia.com/nemo-retriever/) collection.
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| 33 |
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| 34 |
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## Languages
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| 35 |
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| 36 |
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| Subfolder | Language | Total Samples | Train | Test | Validation |
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| 37 |
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|-------------|------------------------|---------------|----------------|----------------|----------------|
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| 38 |
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| `en` | English | 1,825,089 | 1,460,304 (63) | 183,629 (63) | 181,156 (63) |
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| 39 |
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| `ja` | Japanese | 1,889,137 | 1,502,712 (67) | 193,779 (67) | 192,646 (67) |
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| 40 |
+
| `ko` | Korean | 2,269,540 | 1,814,994 (78) | 227,091 (78) | 227,455 (78) |
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| 41 |
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| `ru` | Russian | 1,724,733 | 1,380,404 (59) | 171,678 (59) | 172,651 (59) |
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| 42 |
+
| `zh_hans` | Chinese (Simplified) | 2,335,343 | 1,914,948 (83) | 210,143 (73) | 210,252 (73) |
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| 43 |
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| `zh_hant` | Chinese (Traditional) | 2,214,304 | 1,772,280 (77) | 221,867 (77) | 220,157 (77) |
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| 44 |
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| **Total** | | **12,258,146** | **9,845,642** | **1,208,187** | **1,204,317** |
|
| 45 |
+
|
| 46 |
+
> Numbers in parentheses are the number of `.h5` files per split.
|
| 47 |
+
|
| 48 |
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## Related Model
|
| 49 |
+
|
| 50 |
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This dataset was created to train the detection, recognition, and relational components of [**Nemotron OCR v2**](https://huggingface.co/nvidia/nemotron-ocr-v2). See the model card for architecture details, evaluation results, and usage instructions.
|
| 51 |
+
|
| 52 |
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## Directory Layout
|
| 53 |
+
|
| 54 |
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```
|
| 55 |
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OCR-Synthetic-Multilingual-v1/
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| 56 |
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├── en/
|
| 57 |
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│ ├── train/
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| 58 |
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│ │ ├── train_000.h5
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| 59 |
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│ │ ├── train_001.h5
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| 60 |
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│ │ └── ...
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| 61 |
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│ ├── test/
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| 62 |
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│ │ └── ...
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| 63 |
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│ └── validation/
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| 64 |
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│ └── ...
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| 65 |
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├── ja/
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| 66 |
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│ └── ...
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| 67 |
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├── ko/
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| 68 |
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│ └── ...
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| 69 |
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├── ru/
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| 70 |
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│ └── ...
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| 71 |
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├── zh_hans/
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| 72 |
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│ └── ...
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| 73 |
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└── zh_hant/
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| 74 |
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└── ...
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| 75 |
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```
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| 76 |
+
|
| 77 |
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## Format — HDF5
|
| 78 |
+
|
| 79 |
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Each `.h5` file contains the following datasets (HDF5 terminology):
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| 80 |
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|
| 81 |
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| Key | Type | Description |
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| 82 |
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|---------------|-------------------------------|-------------------------------------------------------|
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| 83 |
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| `images` | object (variable-length bytes)| JPEG-encoded image bytes, one entry per sample |
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| 84 |
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| `annotations` | object (variable-length str) | JSON string per sample containing bounding-box annotations |
|
| 85 |
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| `dimensions` | int array `[H, W]` | Original image dimensions |
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| 86 |
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| `labels` | object (string) | Full-page text label |
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| 87 |
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| `qualities` | int | JPEG quality used during encoding (typically 100) |
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| 88 |
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| `sample_ids` | int | Unique sample identifier |
|
| 89 |
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|
| 90 |
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## Annotation JSON Schema
|
| 91 |
+
|
| 92 |
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Each entry in `annotations` is a JSON object:
|
| 93 |
+
|
| 94 |
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```json
|
| 95 |
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{
|
| 96 |
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"word_bboxes": [
|
| 97 |
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{
|
| 98 |
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"text": "example word or phrase",
|
| 99 |
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"bbox": [x, y, w, h],
|
| 100 |
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"quad": [[x0,y0], [x1,y1], [x2,y2], [x3,y3]]
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| 101 |
+
}
|
| 102 |
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],
|
| 103 |
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"line_bboxes": [
|
| 104 |
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{
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| 105 |
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"text": "full line of text",
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| 106 |
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"bbox": [x, y, w, h],
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| 107 |
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"quad": [[x0,y0], [x1,y1], [x2,y2], [x3,y3]],
|
| 108 |
+
"para_idx": 0,
|
| 109 |
+
"line_idx": 0,
|
| 110 |
+
"word_indices": [0, 1, 2]
|
| 111 |
+
}
|
| 112 |
+
],
|
| 113 |
+
"para_bboxes": [...],
|
| 114 |
+
"relation_graph": [
|
| 115 |
+
[[0], [1], [2]],
|
| 116 |
+
[[3], [4]]
|
| 117 |
+
]
|
| 118 |
+
}
|
| 119 |
+
```
|
| 120 |
+
|
| 121 |
+
### Bounding Box Levels
|
| 122 |
+
|
| 123 |
+
- **`word_bboxes`** — One entry per word/phrase rendered as a single unit. Each contains `text`, an axis-aligned `bbox [x, y, w, h]`, and a 4-point `quad`.
|
| 124 |
+
- **`line_bboxes`** — One entry per text line. Includes all `word_bboxes` fields plus `para_idx` (paragraph index), `line_idx` (line index within the paragraph), and `word_indices` (indices into `word_bboxes` that compose this line).
|
| 125 |
+
- **`para_bboxes`** — One entry per paragraph bounding box.
|
| 126 |
+
- **`relation_graph`** — Nested list encoding reading order: `relation_graph[para][sentence]` gives a list of word/line indices belonging to that sentence within the paragraph.
|
| 127 |
+
|
| 128 |
+
### Quad Vertex Convention
|
| 129 |
+
|
| 130 |
+
Quads are 4-point polygons stored as `[[x0,y0], [x1,y1], [x2,y2], [x3,y3]]` in clockwise order:
|
| 131 |
+
|
| 132 |
+
```
|
| 133 |
+
v0 -------- v1
|
| 134 |
+
| |
|
| 135 |
+
v3 -------- v2
|
| 136 |
+
```
|
| 137 |
+
|
| 138 |
+
## Loading Example
|
| 139 |
+
|
| 140 |
+
```python
|
| 141 |
+
import h5py, io, json
|
| 142 |
+
from PIL import Image
|
| 143 |
+
|
| 144 |
+
with h5py.File("en/train/train_000.h5", "r") as f:
|
| 145 |
+
img_bytes = f["images"][0]
|
| 146 |
+
image = Image.open(io.BytesIO(img_bytes.tobytes())).convert("RGB")
|
| 147 |
+
|
| 148 |
+
annotation = json.loads(f["annotations"][0])
|
| 149 |
+
for line in annotation["line_bboxes"]:
|
| 150 |
+
print(line["text"], line["quad"])
|
| 151 |
+
```
|
| 152 |
+
|
| 153 |
+
---
|
| 154 |
+
|
| 155 |
+
## Per-Language Details
|
| 156 |
+
|
| 157 |
+
### English (`en`)
|
| 158 |
+
|
| 159 |
+
| Property | Value |
|
| 160 |
+
|----------------|--------------------------------------|
|
| 161 |
+
| Language | English (`en`) |
|
| 162 |
+
| Total Samples | 1,825,089 |
|
| 163 |
+
| Train | 1,460,304 samples (63 files) |
|
| 164 |
+
| Test | 183,629 samples (63 files) |
|
| 165 |
+
| Validation | 181,156 samples (63 files) |
|
| 166 |
+
|
| 167 |
+
### Japanese (`ja`)
|
| 168 |
+
|
| 169 |
+
| Property | Value |
|
| 170 |
+
|----------------|--------------------------------------|
|
| 171 |
+
| Language | Japanese (`ja`) |
|
| 172 |
+
| Total Samples | 1,889,137 |
|
| 173 |
+
| Train | 1,502,712 samples (67 files) |
|
| 174 |
+
| Test | 193,779 samples (67 files) |
|
| 175 |
+
| Validation | 192,646 samples (67 files) |
|
| 176 |
+
|
| 177 |
+
### Korean (`ko`)
|
| 178 |
+
|
| 179 |
+
| Property | Value |
|
| 180 |
+
|----------------|--------------------------------------|
|
| 181 |
+
| Language | Korean (`ko`) |
|
| 182 |
+
| Total Samples | 2,269,540 |
|
| 183 |
+
| Train | 1,814,994 samples (78 files) |
|
| 184 |
+
| Test | 227,091 samples (78 files) |
|
| 185 |
+
| Validation | 227,455 samples (78 files) |
|
| 186 |
+
|
| 187 |
+
### Russian (`ru`)
|
| 188 |
+
|
| 189 |
+
| Property | Value |
|
| 190 |
+
|----------------|--------------------------------------|
|
| 191 |
+
| Language | Russian (`ru`) |
|
| 192 |
+
| Total Samples | 1,724,733 |
|
| 193 |
+
| Train | 1,380,404 samples (59 files) |
|
| 194 |
+
| Test | 171,678 samples (59 files) |
|
| 195 |
+
| Validation | 172,651 samples (59 files) |
|
| 196 |
+
|
| 197 |
+
### Chinese Simplified (`zh_hans`)
|
| 198 |
+
|
| 199 |
+
| Property | Value |
|
| 200 |
+
|----------------|--------------------------------------|
|
| 201 |
+
| Language | Chinese (Simplified) (`zh_hans`) |
|
| 202 |
+
| Total Samples | 2,335,343 |
|
| 203 |
+
| Train | 1,914,948 samples (83 files) |
|
| 204 |
+
| Test | 210,143 samples (73 files) |
|
| 205 |
+
| Validation | 210,252 samples (73 files) |
|
| 206 |
+
|
| 207 |
+
### Chinese Traditional (`zh_hant`)
|
| 208 |
+
|
| 209 |
+
| Property | Value |
|
| 210 |
+
|----------------|--------------------------------------|
|
| 211 |
+
| Language | Chinese (Traditional) (`zh_hant`) |
|
| 212 |
+
| Total Samples | 2,214,304 |
|
| 213 |
+
| Train | 1,772,280 samples (77 files) |
|
| 214 |
+
| Test | 221,867 samples (77 files) |
|
| 215 |
+
| Validation | 220,157 samples (77 files) |
|
| 216 |
+
|
| 217 |
+
## Acknowledgements
|
| 218 |
+
|
| 219 |
+
The synthetic data generation pipeline is based on [SynthDoG](https://github.com/clovaai/donut/tree/master/synthdog) from the Donut project, with substantial modifications to support additional languages, custom rendering effects, structured bounding-box annotations (word/line/paragraph levels with reading-order graphs), and HDF5 output.
|
| 220 |
+
|
| 221 |
+
## Citation
|
| 222 |
+
|
| 223 |
+
If you use this dataset, please cite:
|
| 224 |
+
|
| 225 |
+
```bibtex
|
| 226 |
+
@misc{chesler2026ocr_synthetic_multilingual,
|
| 227 |
+
title = {{OCR-Synthetic-Multilingual-v1}},
|
| 228 |
+
author = {Chesler, Ryan},
|
| 229 |
+
year = {2026},
|
| 230 |
+
publisher = {NVIDIA},
|
| 231 |
+
url = {https://huggingface.co/datasets/nvidia/OCR-Synthetic-Multilingual-v1},
|
| 232 |
+
note = {Synthetically generated multilingual OCR dataset built on a heavily modified SynthDoG pipeline}
|
| 233 |
+
}
|
| 234 |
+
```
|
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