Blog

VectorLens Blog

Guides, release notes, and deep dives on working with vector databases and embeddings.

Featured UMAP vs PCA for Embedding Visualization — and When Each One Lies to You
Data Science Machine Learning Vector Database

UMAP vs PCA for Embedding Visualization — and When Each One Lies to You

PCA invents false overlap. UMAP invents false geography. What each projection actually preserves, which parameters rewrite the story, and how to tell a real cluster from a layout artifact.

Read article
ChromaDB vs Qdrant vs Weaviate vs Milvus: Field Notes from Building a Client for All Four
AI Engineering Machine Learning

ChromaDB vs Qdrant vs Weaviate vs Milvus: Field Notes from Building a Client for All Four

Four vector databases, one client - and almost nothing about the metric is portable between them. "Euclidean" is l2 in ChromaDB and...

Jul 22, 2026 Read
Your RAG Pipeline Isn't Broken - Your Vector Store Is
AI Engineering Data Science

Your RAG Pipeline Isn't Broken - Your Vector Store Is

Many RAG systems produce poor results not because of the LLM or vector search, but because of hidden problems in the embedding...

Jul 17, 2026 Read