AI Engineer Programming

Aug 18, 2026 · Artificial Intelligence

Does Reducing Embedding Dimensions Break RAG Retrieval? Practical Trade‑offs and Tests

Vector dimensionality reduction in RAG retrieval compresses information and can degrade recall, NDCG or latency, but the impact depends on task, data distribution, and model architecture, so practitioners must measure cost, speed and accuracy on their own datasets using metrics such as Recall@K, Precision@K and NDCG@K.