ocr

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kakao

The Development of Kakao's " (opens in new tab)

Kakao's Kanana-v-4b-hybrid is a multimodal language model designed to transcend simple image-to-text conversion by integrating logical reasoning and self-verification directly into its response process. By employing a hybrid architecture that handles both intuitive dialogue and complex visual reasoning within a single model, it achieves high accuracy and reliability for sophisticated tasks. This approach allows the model to maintain consistency in user experience while excelling in Korean-specific contexts, as evidenced by its record-breaking 92.8 score on the KoNET evaluation. ### Integrated Hybrid Architecture * Consolidates intuitive tasks (like OCR and summarization) and logical tasks (complex reasoning) into a single model to reduce system complexity and maintenance costs. * Eliminates the need for external routing between specialized models, ensuring a consistent tone, response format, and safety policy throughout a single conversation session. * Utilizes a refined training recipe that balances data ratios and visual reasoning training to ensure that improvements in multimodal understanding benefit all types of user queries. ### Visual Reasoning and Self-Reflection * Follows a natural logic flow: synthesizing information from images and text, applying conditions, verifying candidates, and finally concluding the response. * Features a "Reflection" mechanism where the model actively monitors its own thought process to catch "small but fatal" errors, such as calculation mistakes or missed constraints. * Excels in high-stakes visual tasks like receipt auditing, table filtering, and mathematical problem-solving by double-checking intermediate results against original image data. ### Native Korean Logical Processing * Prioritizes "thinking in Korean" to accurately preserve the nuances of complex constraints, such as "except for X" or "only in cases of Y," which are often lost during internal translation. * Develops a native Korean Rationale process to prevent logical drift, ensuring that the internal reasoning steps remain perfectly aligned with the linguistic structure of the user's query. * Addresses the difficulty of processing information scattered throughout Korean-language documents or exam papers by synthesizing data without language-conversion overhead. Kanana-v-4b-hybrid marks a shift toward "verifiable AI" that provides evidence-based answers rather than just plausible text. For applications in education, finance, or complex document processing, this model offers a blueprint for building trust through transparent reasoning and self-correction.

naver

I'm an LL (opens in new tab)

Processing complex PDF documents remains a significant bottleneck for Large Language Models (LLMs) due to the intricate layouts, nested tables, and visual charts that standard text extractors often fail to capture. To address this, NAVER developed PaLADIN, an LLM-friendly PDF parser designed to transform visual document elements into structured data that models can accurately interpret. By combining specialized vision models with advanced OCR, the system enables high-fidelity document understanding for demanding tasks like analyzing financial reports. ### Challenges in Document Intelligence * Standard PDF parsing often loses the semantic structure of the document, such as the relationship between headers and body text. * Tables and charts pose the greatest difficulty, as numerical values and trends must be extracted without losing the spatial context that defines their meaning. * A "one-size-fits-all" approach to text extraction results in "hallucinations" when LLMs attempt to reconstruct data from fragmented strings. ### The PaLADIN Architecture and Model Integration * **Element Detection:** The system utilizes `Doclayout-Yolo` to identify and categorize document components like text blocks, titles, tables, and figures. * **Table Extraction:** Visual table structures are processed through `nemoretriever-table-structure-v1`, ensuring that cell boundaries and headers are preserved. * **Chart Interpretation:** To convert visual charts into descriptive text or data, the parser employs `google/gemma3-27b-it`, allowing the LLM to "read" visual trends. * **Text Recognition:** For high-accuracy character recognition, particularly in multi-lingual contexts, the pipeline integrates NAVER’s `Papago OCR`. * **Infrastructure:** The architecture leverages `nv-ingest` for optimized throughput and speed, making it suitable for large-scale document processing. ### Evaluation and Real-world Application * **Performance Metrics:** NAVER established a dedicated parsing evaluation set to measure accuracy across diverse document types, focusing on speed and structural integrity. * **AIB Securities Reports:** The parser is currently applied to summarize complex stock market reports, where precision in numerical data is critical. * **LLM-as-a-Judge:** To ensure summary quality, the system uses an automated evaluation framework where a high-performing LLM judges the accuracy of the generated summaries against the parsed source data. For organizations building RAG (Retrieval-Augmented Generation) systems, the transition from basic text extraction to a layout-aware parsing pipeline like PaLADIN is crucial. Future improvements focusing on table cell coordinate precision and more granular chart analysis will further reduce the error rates in automated document processing.