Add LightOnOCR script for fast document OCR

Adds lighton-ocr.py - a UV script for processing documents with
LightOnOCR, a compact 1B OCR model optimized for production speed.

Features:
- Fast: 5.71 pages/sec on H100 GPU
- Compact: Only 1B parameters
- 3 vocabulary variants (151k/32k/16k tokens)
- European language optimization (12% faster with 32k/16k)
- LaTeX formula and table extraction
- Markdown output format
- Image preprocessing (1288px target size)

Based on dots-ocr.py template with adaptations:
- LightOnOCR-specific sampling params (temp=0.2, top_p=0.9)
- Automatic image resizing to optimal dimensions
- Vocabulary size selection
- Simplified prompt handling (no special modes)

Model: lightonai/LightOnOCR-1B-1025
vLLM: Officially supported in model registry
Blog: https://huggingface.co/blog/lightonai/lightonocr

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

lighton-ocr.py

@@ -0,0 +1,628 @@
+# /// script
+# requires-python = ">=3.11"
+# dependencies = [
+#     "datasets",
+#     "huggingface-hub[hf_transfer]",
+#     "pillow",
+#     "vllm>=0.9.1",
+#     "tqdm",
+#     "toolz",
+#     "torch",
+# ]
+#
+# ///
+
+"""
+Convert document images to markdown using LightOnOCR with vLLM.
+
+LightOnOCR is a compact 1B multilingual OCR model optimized for production speed.
+Combines Pixtral ViT encoder with Qwen3 language model for efficient document parsing.
+
+Features:
+- ⚡ Fastest: 5.71 pages/sec on H100 GPU
+- 🎯 Compact: Only 1B parameters
+- 🌍 Multilingual with European language optimization
+- 📐 LaTeX formula recognition
+- 📊 Table extraction (markdown format)
+- 📝 Document structure preservation
+- 🔤 3 vocabulary sizes (151k/32k/16k tokens)
+
+Model: lightonai/LightOnOCR-1B-1025
+vLLM: Officially supported in model registry
+Performance: 76.1% overall benchmark score
+"""
+
+import argparse
+import base64
+import io
+import json
+import logging
+import os
+import sys
+from typing import Any, Dict, List, Union
+from datetime import datetime
+
+import torch
+from datasets import load_dataset
+from huggingface_hub import DatasetCard, login
+from PIL import Image
+from toolz import partition_all
+from tqdm.auto import tqdm
+from vllm import LLM, SamplingParams
+
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
+
+
+# Model variants with different vocabulary sizes
+MODEL_VARIANTS = {
+    "151k": "lightonai/LightOnOCR-1B-1025",  # Full vocabulary (default)
+    "32k": "lightonai/LightOnOCR-0.9B-32k-1025",  # European languages optimized
+    "16k": "lightonai/LightOnOCR-0.9B-16k-1025",  # European languages optimized
+}
+
+
+def check_cuda_availability():
+    """Check if CUDA is available and exit if not."""
+    if not torch.cuda.is_available():
+        logger.error("CUDA is not available. This script requires a GPU.")
+        logger.error("Please run on a machine with a CUDA-capable GPU.")
+        sys.exit(1)
+    else:
+        logger.info(f"CUDA is available. GPU: {torch.cuda.get_device_name(0)}")
+
+
+def resize_image_to_target(image: Image.Image, target_size: int = 1288) -> Image.Image:
+    """
+    Resize image so longest dimension is target_size while maintaining aspect ratio.
+
+    LightOnOCR is optimized for 1280-1300px longest dimension at 300 DPI.
+    """
+    width, height = image.size
+
+    # If image is already smaller, don't upscale
+    if max(width, height) <= target_size:
+        return image
+
+    # Calculate new dimensions maintaining aspect ratio
+    if width > height:
+        new_width = target_size
+        new_height = int(height * (target_size / width))
+    else:
+        new_height = target_size
+        new_width = int(width * (target_size / height))
+
+    return image.resize((new_width, new_height), Image.Resampling.LANCZOS)
+
+
+def make_ocr_message(
+    image: Union[Image.Image, Dict[str, Any], str],
+    resize: bool = True,
+    target_size: int = 1288,
+) -> List[Dict]:
+    """
+    Create chat message for OCR processing.
+
+    LightOnOCR expects images at 1280-1300px longest dimension for optimal results.
+    """
+    # Convert to PIL Image if needed
+    if isinstance(image, Image.Image):
+        pil_img = image
+    elif isinstance(image, dict) and "bytes" in image:
+        pil_img = Image.open(io.BytesIO(image["bytes"]))
+    elif isinstance(image, str):
+        pil_img = Image.open(image)
+    else:
+        raise ValueError(f"Unsupported image type: {type(image)}")
+
+    # Convert to RGB
+    pil_img = pil_img.convert("RGB")
+
+    # Resize to optimal dimensions for LightOnOCR
+    if resize:
+        pil_img = resize_image_to_target(pil_img, target_size)
+        logger.debug(f"Resized image to {pil_img.size}")
+
+    # Convert to base64 data URI
+    buf = io.BytesIO()
+    pil_img.save(buf, format="PNG")
+    data_uri = f"data:image/png;base64,{base64.b64encode(buf.getvalue()).decode()}"
+
+    # LightOnOCR uses simple message format (no explicit prompt text needed)
+    return [
+        {
+            "role": "user",
+            "content": [
+                {"type": "image_url", "image_url": {"url": data_uri}},
+            ],
+        }
+    ]
+
+
+def create_dataset_card(
+    source_dataset: str,
+    model: str,
+    vocab_size: str,
+    num_samples: int,
+    processing_time: str,
+    batch_size: int,
+    max_model_len: int,
+    max_tokens: int,
+    gpu_memory_utilization: float,
+    temperature: float,
+    top_p: float,
+    target_size: int,
+    image_column: str = "image",
+    split: str = "train",
+) -> str:
+    """Create a dataset card documenting the OCR process."""
+    model_name = model.split("/")[-1]
+
+    return f"""---
+tags:
+- ocr
+- document-processing
+- lighton-ocr
+- markdown
+- uv-script
+- generated
+---
+
+# Document OCR using {model_name}
+
+This dataset contains OCR results from images in [{source_dataset}](https://huggingface.co/datasets/{source_dataset}) using LightOnOCR, a fast and compact 1B OCR model.
+
+## Processing Details
+
+- **Source Dataset**: [{source_dataset}](https://huggingface.co/datasets/{source_dataset})
+- **Model**: [{model}](https://huggingface.co/{model})
+- **Vocabulary Size**: {vocab_size} tokens
+- **Number of Samples**: {num_samples:,}
+- **Processing Time**: {processing_time}
+- **Processing Date**: {datetime.now().strftime("%Y-%m-%d %H:%M UTC")}
+
+### Configuration
+
+- **Image Column**: `{image_column}`
+- **Output Column**: `markdown`
+- **Dataset Split**: `{split}`
+- **Batch Size**: {batch_size}
+- **Target Image Size**: {target_size}px (longest dimension)
+- **Max Model Length**: {max_model_len:,} tokens
+- **Max Output Tokens**: {max_tokens:,}
+- **Temperature**: {temperature}
+- **Top P**: {top_p}
+- **GPU Memory Utilization**: {gpu_memory_utilization:.1%}
+
+## Model Information
+
+LightOnOCR is a fast, compact OCR model that excels at:
+- ⚡ **Production Speed** - 5.71 pages/second on H100 GPU
+- 🎯 **Compact Size** - Only 1B parameters
+- 📐 **LaTeX formulas** - Mathematical notation in LaTeX format
+- 📊 **Tables** - Extracted and formatted as markdown
+- 📝 **Document structure** - Hierarchy and layout preservation
+- 🌍 **Multilingual** - Optimized for European languages
+- 🔤 **Flexible vocabulary** - 151k/32k/16k token variants
+
+### Vocabulary Variants
+
+- **151k tokens**: Full vocabulary, supports all languages
+- **32k tokens**: European languages optimized (~12% faster decoding)
+- **16k tokens**: European languages optimized (~12% faster decoding)
+
+## Dataset Structure
+
+The dataset contains all original columns plus:
+- `markdown`: The extracted text in markdown format with LaTeX formulas
+- `inference_info`: JSON list tracking all OCR models applied to this dataset
+
+## Usage
+
+```python
+from datasets import load_dataset
+import json
+
+# Load the dataset
+dataset = load_dataset("{{output_dataset_id}}", split="{split}")
+
+# Access the markdown text
+for example in dataset:
+    print(example["markdown"])
+    break
+
+# View all OCR models applied to this dataset
+inference_info = json.loads(dataset[0]["inference_info"])
+for info in inference_info:
+    print(f"Column: {{info['column_name']}} - Model: {{info['model_id']}}")
+```
+
+## Reproduction
+
+This dataset was generated using the [uv-scripts/ocr](https://huggingface.co/datasets/uv-scripts/ocr) LightOnOCR script:
+
+```bash
+uv run https://huggingface.co/datasets/uv-scripts/ocr/raw/main/lighton-ocr.py \\
+    {source_dataset} \\
+    <output-dataset> \\
+    --vocab-size {vocab_size} \\
+    --image-column {image_column} \\
+    --batch-size {batch_size}
+```
+
+## Performance
+
+- **Processing Speed**: ~{num_samples / (float(processing_time.split()[0]) * 60):.2f} images/second
+- **Benchmark Score**: 76.1% overall (across diverse document types)
+- **Optimization**: Native resolution ViT + lightweight decoder
+
+Generated with 🤖 [UV Scripts](https://huggingface.co/uv-scripts)
+"""
+
+
+def main(
+    input_dataset: str,
+    output_dataset: str,
+    image_column: str = "image",
+    batch_size: int = 16,
+    vocab_size: str = "151k",
+    max_model_len: int = 8192,
+    max_tokens: int = 6500,
+    temperature: float = 0.2,
+    top_p: float = 0.9,
+    gpu_memory_utilization: float = 0.8,
+    target_size: int = 1288,
+    no_resize: bool = False,
+    hf_token: str = None,
+    split: str = "train",
+    max_samples: int = None,
+    private: bool = False,
+    shuffle: bool = False,
+    seed: int = 42,
+    output_column: str = "markdown",
+):
+    """Process images from HF dataset through LightOnOCR model."""
+
+    # Check CUDA availability first
+    check_cuda_availability()
+
+    # Track processing start time
+    start_time = datetime.now()
+
+    # Enable HF_TRANSFER for faster downloads
+    os.environ["HF_HUB_ENABLE_HF_TRANSFER"] = "1"
+
+    # Login to HF if token provided
+    HF_TOKEN = hf_token or os.environ.get("HF_TOKEN")
+    if HF_TOKEN:
+        login(token=HF_TOKEN)
+
+    # Get model ID from vocabulary size
+    if vocab_size not in MODEL_VARIANTS:
+        raise ValueError(
+            f"Invalid vocab_size '{vocab_size}'. Choose from: {list(MODEL_VARIANTS.keys())}"
+        )
+    model = MODEL_VARIANTS[vocab_size]
+    logger.info(f"Using model: {model} ({vocab_size} vocabulary)")
+
+    # Load dataset
+    logger.info(f"Loading dataset: {input_dataset}")
+    dataset = load_dataset(input_dataset, split=split)
+
+    # Validate image column
+    if image_column not in dataset.column_names:
+        raise ValueError(
+            f"Column '{image_column}' not found. Available: {dataset.column_names}"
+        )
+
+    # Shuffle if requested
+    if shuffle:
+        logger.info(f"Shuffling dataset with seed {seed}")
+        dataset = dataset.shuffle(seed=seed)
+
+    # Limit samples if requested
+    if max_samples:
+        dataset = dataset.select(range(min(max_samples, len(dataset))))
+        logger.info(f"Limited to {len(dataset)} samples")
+
+    # Initialize vLLM model
+    logger.info(f"Initializing vLLM with LightOnOCR")
+    logger.info("This may take a few minutes on first run...")
+    llm = LLM(
+        model=model,
+        trust_remote_code=True,
+        max_model_len=max_model_len,
+        gpu_memory_utilization=gpu_memory_utilization,
+        limit_mm_per_prompt={"image": 1},  # One image per prompt
+        enforce_eager=False,  # Use torch.compile for better performance
+    )
+
+    # LightOnOCR recommended sampling parameters
+    sampling_params = SamplingParams(
+        temperature=temperature,
+        top_p=top_p,
+        max_tokens=max_tokens,
+    )
+
+    logger.info(f"Processing {len(dataset)} images in batches of {batch_size}")
+    logger.info(f"Output will be written to column: {output_column}")
+    if not no_resize:
+        logger.info(f"Images will be resized to {target_size}px (longest dimension)")
+
+    # Process images in batches
+    all_outputs = []
+
+    for batch_indices in tqdm(
+        partition_all(batch_size, range(len(dataset))),
+        total=(len(dataset) + batch_size - 1) // batch_size,
+        desc="LightOnOCR processing",
+    ):
+        batch_indices = list(batch_indices)
+        batch_images = [dataset[i][image_column] for i in batch_indices]
+
+        try:
+            # Create messages for batch
+            batch_messages = [
+                make_ocr_message(img, resize=not no_resize, target_size=target_size)
+                for img in batch_images
+            ]
+
+            # Process with vLLM
+            outputs = llm.chat(batch_messages, sampling_params)
+
+            # Extract outputs
+            for output in outputs:
+                text = output.outputs[0].text.strip()
+                all_outputs.append(text)
+
+        except Exception as e:
+            logger.error(f"Error processing batch: {e}")
+            # Add error placeholders for failed batch
+            all_outputs.extend(["[OCR ERROR]"] * len(batch_images))
+
+    # Calculate processing time
+    processing_duration = datetime.now() - start_time
+    processing_time_str = f"{processing_duration.total_seconds() / 60:.1f} min"
+
+    # Add output column to dataset
+    logger.info(f"Adding '{output_column}' column to dataset")
+    dataset = dataset.add_column(output_column, all_outputs)
+
+    # Handle inference_info tracking (for multi-model comparisons)
+    inference_entry = {
+        "model_id": model,
+        "model_name": "LightOnOCR",
+        "vocab_size": vocab_size,
+        "column_name": output_column,
+        "timestamp": datetime.now().isoformat(),
+        "temperature": temperature,
+        "top_p": top_p,
+        "max_tokens": max_tokens,
+        "target_size": target_size if not no_resize else "original",
+    }
+
+    if "inference_info" in dataset.column_names:
+        # Append to existing inference info
+        logger.info("Updating existing inference_info column")
+
+        def update_inference_info(example):
+            try:
+                existing_info = json.loads(example["inference_info"]) if example["inference_info"] else []
+            except (json.JSONDecodeError, TypeError):
+                existing_info = []
+
+            existing_info.append(inference_entry)
+            return {"inference_info": json.dumps(existing_info)}
+
+        dataset = dataset.map(update_inference_info)
+    else:
+        # Create new inference_info column
+        logger.info("Creating new inference_info column")
+        inference_list = [json.dumps([inference_entry])] * len(dataset)
+        dataset = dataset.add_column("inference_info", inference_list)
+
+    # Push to hub
+    logger.info(f"Pushing to {output_dataset}")
+    dataset.push_to_hub(output_dataset, private=private, token=HF_TOKEN)
+
+    # Create and push dataset card
+    logger.info("Creating dataset card")
+    card_content = create_dataset_card(
+        source_dataset=input_dataset,
+        model=model,
+        vocab_size=vocab_size,
+        num_samples=len(dataset),
+        processing_time=processing_time_str,
+        batch_size=batch_size,
+        max_model_len=max_model_len,
+        max_tokens=max_tokens,
+        gpu_memory_utilization=gpu_memory_utilization,
+        temperature=temperature,
+        top_p=top_p,
+        target_size=target_size,
+        image_column=image_column,
+        split=split,
+    )
+
+    card = DatasetCard(card_content)
+    card.push_to_hub(output_dataset, token=HF_TOKEN)
+
+    logger.info("✅ LightOnOCR processing complete!")
+    logger.info(f"Dataset available at: https://huggingface.co/datasets/{output_dataset}")
+    logger.info(f"Processing time: {processing_time_str}")
+    logger.info(f"Processing speed: {len(dataset) / processing_duration.total_seconds():.2f} images/sec")
+
+
+if __name__ == "__main__":
+    # Show example usage if no arguments
+    if len(sys.argv) == 1:
+        print("=" * 80)
+        print("LightOnOCR Document Processing")
+        print("=" * 80)
+        print("\nFast, compact 1B OCR model for production workloads")
+        print("\nFeatures:")
+        print("- ⚡ Fastest processing: 5.71 pages/sec on H100")
+        print("- 🎯 Compact: Only 1B parameters")
+        print("- 🌍 Multilingual with European language optimization")
+        print("- 📐 LaTeX formula recognition")
+        print("- 📊 Table extraction (markdown format)")
+        print("- 🔤 3 vocabulary sizes for speed/quality tradeoffs")
+        print("\nExample usage:")
+        print("\n1. Basic OCR (full vocabulary):")
+        print("   uv run lighton-ocr.py input-dataset output-dataset")
+        print("\n2. European languages optimized (faster):")
+        print("   uv run lighton-ocr.py docs results --vocab-size 32k")
+        print("\n3. Custom batch size for performance:")
+        print("   uv run lighton-ocr.py docs results --batch-size 32")
+        print("\n4. Test with small sample:")
+        print("   uv run lighton-ocr.py large-dataset test --max-samples 50 --shuffle")
+        print("\n5. Original image size (no resize):")
+        print("   uv run lighton-ocr.py docs output --no-resize")
+        print("\n6. Running on HF Jobs:")
+        print("   hf jobs uv run --flavor l4x1 \\")
+        print("     -e HF_TOKEN=$(python3 -c \"from huggingface_hub import get_token; print(get_token())\") \\")
+        print("     -e HF_HUB_ENABLE_HF_TRANSFER=1 \\")
+        print("     https://huggingface.co/datasets/uv-scripts/ocr/raw/main/lighton-ocr.py \\")
+        print("       input-dataset output-dataset --vocab-size 32k")
+        print("\n" + "=" * 80)
+        print("\nVocabulary Size Options:")
+        print("  151k - Full vocabulary (all languages)")
+        print("  32k  - European languages (~12% faster)")
+        print("  16k  - European languages (~12% faster)")
+        print("\nFor full help, run: uv run lighton-ocr.py --help")
+        sys.exit(0)
+
+    parser = argparse.ArgumentParser(
+        description="Document OCR using LightOnOCR (fast 1B model)",
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+        epilog="""
+Vocabulary Size Options:
+  151k    Full vocabulary supporting all languages (default)
+  32k     European languages optimized (~12% faster decoding)
+  16k     European languages optimized (~12% faster decoding)
+
+Examples:
+  # Basic text OCR with full vocabulary
+  uv run lighton-ocr.py my-docs analyzed-docs
+
+  # Fast processing for European languages
+  uv run lighton-ocr.py papers results --vocab-size 32k
+
+  # Test with random sampling
+  uv run lighton-ocr.py large-dataset test --max-samples 50 --shuffle
+
+  # Custom batch size for GPU optimization
+  uv run lighton-ocr.py dataset output --batch-size 32 --gpu-memory-utilization 0.9
+        """,
+    )
+
+    parser.add_argument("input_dataset", help="Input dataset ID from Hugging Face Hub")
+    parser.add_argument("output_dataset", help="Output dataset ID for Hugging Face Hub")
+    parser.add_argument(
+        "--image-column",
+        default="image",
+        help="Column containing images (default: image)",
+    )
+    parser.add_argument(
+        "--batch-size",
+        type=int,
+        default=16,
+        help="Batch size for processing (default: 16)",
+    )
+    parser.add_argument(
+        "--vocab-size",
+        default="151k",
+        choices=list(MODEL_VARIANTS.keys()),
+        help="Vocabulary size variant (default: 151k)",
+    )
+    parser.add_argument(
+        "--max-model-len",
+        type=int,
+        default=8192,
+        help="Maximum model context length (default: 8192)",
+    )
+    parser.add_argument(
+        "--max-tokens",
+        type=int,
+        default=6500,
+        help="Maximum tokens to generate (default: 6500)",
+    )
+    parser.add_argument(
+        "--temperature",
+        type=float,
+        default=0.2,
+        help="Sampling temperature (default: 0.2)",
+    )
+    parser.add_argument(
+        "--top-p",
+        type=float,
+        default=0.9,
+        help="Top-p sampling parameter (default: 0.9)",
+    )
+    parser.add_argument(
+        "--gpu-memory-utilization",
+        type=float,
+        default=0.8,
+        help="GPU memory utilization (default: 0.8)",
+    )
+    parser.add_argument(
+        "--target-size",
+        type=int,
+        default=1288,
+        help="Target size for longest image dimension in pixels (default: 1288)",
+    )
+    parser.add_argument(
+        "--no-resize",
+        action="store_true",
+        help="Don't resize images (use original size)",
+    )
+    parser.add_argument("--hf-token", help="Hugging Face API token")
+    parser.add_argument(
+        "--split", default="train", help="Dataset split to use (default: train)"
+    )
+    parser.add_argument(
+        "--max-samples",
+        type=int,
+        help="Maximum number of samples to process (for testing)",
+    )
+    parser.add_argument(
+        "--private", action="store_true", help="Make output dataset private"
+    )
+    parser.add_argument(
+        "--shuffle", action="store_true", help="Shuffle dataset before processing"
+    )
+    parser.add_argument(
+        "--seed",
+        type=int,
+        default=42,
+        help="Random seed for shuffling (default: 42)",
+    )
+    parser.add_argument(
+        "--output-column",
+        default="markdown",
+        help="Column name for output text (default: markdown)",
+    )
+
+    args = parser.parse_args()
+
+    main(
+        input_dataset=args.input_dataset,
+        output_dataset=args.output_dataset,
+        image_column=args.image_column,
+        batch_size=args.batch_size,
+        vocab_size=args.vocab_size,
+        max_model_len=args.max_model_len,
+        max_tokens=args.max_tokens,
+        temperature=args.temperature,
+        top_p=args.top_p,
+        gpu_memory_utilization=args.gpu_memory_utilization,
+        target_size=args.target_size,
+        no_resize=args.no_resize,
+        hf_token=args.hf_token,
+        split=args.split,
+        max_samples=args.max_samples,
+        private=args.private,
+        shuffle=args.shuffle,
+        seed=args.seed,
+        output_column=args.output_column,
+    )