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README.md
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- llm-compressor
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- ocr
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- vlm
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- llm-compressor
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- ocr
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- vlm
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---
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+

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# **chandra-FP8-Latest**
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> **chandra-FP8-Latest** is an FP8-compressed evolution built on top of **datalab-to/chandra**. This variant leverages **BF16 · FP8 (F8_E4M3)** precision formats to significantly reduce memory footprint and improve inference efficiency while preserving the high-precision OCR and layout-aware reasoning capabilities of the original architecture.
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> The result is a highly efficient document intelligence vision-language model optimized for complex parsing, structured output generation, and production-scale deployment.
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> [!important]
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> FP8 (8-bit floating point) weight and activation quantization using hardware acceleration on GPUs – [FP8 W8A8](https://docs.vllm.ai/en/stable/features/quantization/fp8/). Quantization W8A8 FP8-dynamic recipe – [examples](https://github.com/vllm-project/llm-compressor/tree/main/examples/quantization_w8a8_fp8).
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## About the Base Model
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**Chandra** from datalab-to is a state-of-the-art open-source OCR vision-language model designed for complex document parsing and high-fidelity layout reconstruction.
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It excels at:
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* **Handwriting Recognition** across diverse styles
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* **Table Structure Preservation**, including merged and nested cells
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* **Mathematical Equation Rendering** into clean LaTeX
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* **Form Reconstruction** with checkboxes and radio buttons
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* **Multi-Column Layout Parsing**
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* **40+ Language Support**
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* **Precise Bounding Box Extraction** for every text block, table, and image
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Chandra outputs structured **Markdown, HTML, or JSON** with layout-aware coordinates, enabling seamless integration into document intelligence pipelines.
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It handles challenging real-world inputs such as:
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* Doctor notes
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* Financial filings
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* Invoices
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* Textbooks
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* Government forms
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* Low-quality or messy scanned documents
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## What FP8 Adds
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The **chandra-FP8-Latest** variant introduces:
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* **BF16 · FP8 (F8_E4M3) Compression**: Transformer Engine–based quantization reduces VRAM usage while maintaining OCR precision and layout fidelity.
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* **Higher Throughput**: Faster document parsing at scale.
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* **Lower Memory Footprint**: Improved deployment feasibility on Hopper-class and compatible GPUs.
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* **Production Optimization**: Ideal for high-volume PDF ingestion and enterprise document processing.
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## Deployment Support
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Chandra supports:
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* **Hugging Face Transformers** for local inference
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* **vLLM server deployment** for high-throughput production environments
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* Layout-aware prompts such as `"ocr_layout"`
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* Configurable `max_output_tokens` up to **8192 per page**
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* CLI workflows with environment-based configuration
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* Page-range processing for PDFs
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This makes it well-suited for enterprise-scale document AI systems.
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## Quick Start with Transformers
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```python
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from transformers import Qwen3VLForConditionalGeneration, AutoProcessor
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from qwen_vl_utils import process_vision_info
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import torch
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# Load the FP8-compressed chandra model
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model = Qwen3VLForConditionalGeneration.from_pretrained(
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"prithivMLmods/chandra-FP8",
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torch_dtype="auto",
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device_map="auto"
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)
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processor = AutoProcessor.from_pretrained(
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"prithivMLmods/chandra-FP8"
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)
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messages = [
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{
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"role": "user",
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"content": [
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{
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"type": "image",
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"image": "https://qianwen-res.oss-cn-beijing.aliyuncs.com/Qwen-VL/assets/demo.jpeg",
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},
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{"type": "text", "text": "Analyze the fine-grained details in this image."},
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],
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}
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]
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text = processor.apply_chat_template(
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messages, tokenize=False, add_generation_prompt=True
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)
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image_inputs, video_inputs = process_vision_info(messages)
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inputs = processor(
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text=[text],
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images=image_inputs,
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videos=video_inputs,
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padding=True,
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return_tensors="pt",
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).to("cuda")
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generated_ids = model.generate(**inputs, max_new_tokens=256)
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generated_ids_trimmed = [
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out_ids[len(in_ids):] for in_ids, out_ids in zip(inputs.input_ids, generated_ids)
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]
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output_text = processor.batch_decode(
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generated_ids_trimmed,
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skip_special_tokens=True,
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clean_up_tokenization_spaces=False
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)
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print(output_text)
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```
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## Intended Use
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* High-precision OCR pipelines
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* Financial and legal document processing
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* Academic and textbook digitization
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* Automated form parsing
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* Enterprise document intelligence systems
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* AI data ingestion pipelines
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## License
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Licensed under a modified **[OpenRAIL-M](https://huggingface.co/datalab-to/chandra/blob/main/LICENSE)** framework:
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* Apache 2.0 for code
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* Commercial restrictions for competitors exceeding $2M revenue
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Please review the base model license terms before commercial deployment.
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## Limitations & Considerations
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* FP8 requires compatible GPU hardware for optimal acceleration.
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* Extremely low-resolution or heavily degraded scans may still impact recognition quality.
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* Users are responsible for ensuring lawful and compliant deployment in regulated environments.
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