Baidu Unlimited-OCR Deep Dive: Constant KV Cache, R-SWA, and 32K Long-Context OCR Deployment
Title: Beyond Fragmented Scanning: A Practical Guide to Baidu’s Unlimited-OCR with Constant KV Cache Does processing long PDFs crash your server’s memory? This article explores Baidu’s 2026 open-source project, Unlimited-OCR, focusing on its R-SWA attention mechanism, Constant KV Cache technology, and providing a complete SGLang deployment guide for high-concurrency 32K token parsing. Processing long documents has always been a technical nightmare. When development teams attempt to feed a fifty-page financial report or a complex technical manual into a model, server memory is inevitably overwhelmed. Engineers are often forced to write scripts to fragment the document, leading to broken tables and lost logical connections across context, followed by complex code to piece the fragmented information back together.



