Intelligent News Summarization System: A Generative AI Practice Integrating Multiple Retrieval Technologies

This project deeply analyzes an intelligent news summarization system based on RAG technology, integrating three technical routes: dense retrieval, hybrid retrieval, and fusion retrieval. It compares the effects of multiple models such as GPT, Llama, and Qwen, and realizes personalized summary generation, aiming to solve the need for users to quickly obtain key news information in the era of information explosion.

In the era of information explosion, users find it difficult to quickly obtain key information from massive news. Traditional recommendation systems rely on collaborative filtering or content-based recommendation, which are hard to meet the needs of deep understanding and personalized summarization. RAG technology combines retrieval systems with generative large language models to ensure content accuracy and generation flexibility. This project explores the application of multiple retrieval strategies in news summarization scenarios, providing technical references for intelligent news services.

Dense Retrieval

Neural networks are used to encode queries and documents into dense vectors. Semantic-level similarity is captured through vector similarity, enabling understanding of users' diverse expressions (e.g., "latest tech trends" matching content like "AI breakthroughs").

Hybrid Retrieval

Combines sparse retrieval (e.g., BM25) with dense retrieval to balance recall and precision, adapting to queries that include specific keywords (names of people, places) and abstract topics.

Fusion Retrieval

Dynamically fuses multiple retrieval signals through machine learning models, and adaptively adjusts strategies based on news categories, query complexity, etc. (e.g., breaking news focuses on time sorting and keyword matching, while deep analysis needs focus on semantic understanding).

The system supports models such as GPT, Llama, and Qwen:

• GPT series: Strong instruction-following ability and high generation quality;
• Llama series: Open-source and customizable, suitable for local deployment;
• Qwen series: Excellent in Chinese processing.

The system can automatically select models based on news language, summary length, response time, etc. (e.g., Qwen is prioritized for short Chinese news, and GPT-4-level models are used for in-depth international news).

Through user profile construction and query intent understanding, retrieval strategies and generation prompts are dynamically adjusted:

• Technical practitioners: Retrieval focuses on technical term matching, and generation retains professional details;
• Investors: Focus on business impacts;
• General readers: Use plain language to explain social significance. This meets the personalized concerns of different users for the same news.

Real-time Requirements

Incremental indexing and index hot update technologies are adopted to ensure that new news can be retrieved quickly and services are stable.

Multilingual Processing

Multilingual embedding models (e.g., mE5, LaBSE) are used to support cross-language retrieval, and multilingual output is achieved through multilingual large models or translation pipelines.

Content Deduplication and Diversity

An intelligent deduplication mechanism avoids duplicate content, balances user interest matching and content diversity, and prevents the information cocoon effect.

1. Personal News Assistant: Generate personalized summaries for subscribed topics, allowing quick understanding of trends in fragmented time;
2. Media Content Production Assistance: Help editors quickly obtain event backgrounds and generate summaries of timelines and key nodes;
3. Public Opinion Monitoring and Analysis: Extract key opinions, generate public opinion summaries and trend analyses, and assist enterprises/government in decision-making.

This project compares three retrieval strategies and the effects of multiple models, providing a comprehensive technical reference for intelligent news summarization systems. In the future, we will integrate multi-modal content such as images and videos, enhance personalization technology, and realize "one thousand people, one thousand faces" intelligent information acquisition.