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Implementing Image Similarity Search with Milvus and CLIP

Towards Data Science •
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E-commerce platforms struggle with duplicate listings and search quality when product titles differ despite identical visuals. To solve this, developers use vector databases to transform images into numerical embeddings. This process allows systems to find visually similar items quickly across millions of products, which is far more efficient than relying on text-based metadata alone.

Implementing this workflow involves using the clip-Vi T-B-32 model to convert JPEGs into 512-dimensional vectors. These embeddings are then stored in Milvus, where a schema defines fields for product SKUs and vectors. Using the pymilvus module, engineers can index these collections with IVF_FLAT to reduce query latency and accelerate search speeds.

Search operations rely on Approximate Nearest Neighbor (ANN) logic to locate the most similar results. While increasing vector dimensions captures more detail, it also increases storage costs and latency. Using COSINE similarity helps identify visual matches, though the author warns that visual similarity does not always mean the items are functionally related.

Batching data is necessary when loading millions of entities to prevent system crashes. By processing data in chunks of 10,000, developers maintain stability while populating the database. This architecture enables fast, scalable image retrieval for duplicate detection and improved user experience.