Part 2: SFT Data Engineering — NEFTune & Synthetic Data Curation

← Previous Chapter: Part 1: Hybrid AI Architecture | Series Hub | Next Chapter: Part 3: QLoRA & Axolotl Fine-Tuning → Answer-first: Data quality completely dictates SLM performance. 5,000 meticulously verified, diverse instruction examples consistently outperform 100,000 noisy scraped samples. Adding NEFTune noise injection ($lpha = 5$) to embedding layers prevents overfitting and improves out-of-distribution reasoning.

Enterprise AI Data Pipeline & GraphRAG Architecture

Series Overview Answer-first: This series details enterprise AI data pipeline engineering, covering GraphRAG, multimodal document ingestion, late chunking, streaming CDC, and vLLM inference. No matter how sophisticated the Prompts or how smooth the UI of an AI/Agentic system is, it will still “hallucinate” if the underlying data is garbage. In 2026, Naive RAG (simply chunking text and throwing it into a Vector Database) is dead for complex enterprise problems. Instead, we must solve the difficult challenges of Data Engineering: processing millions of pages of unstructured documents (PDFs, tables, diagrams), linking them into a Knowledge Graph (GraphRAG), maintaining Role-Based Access Control (RBAC), and continuously measuring accuracy (Evals). ...