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Exploring Static Embedding Retrieval

LlamaIndex Blog ·

Logan Markewich reports on the team’s experiments with static embedding retrieval. He explains where MaxSim scoring and small convolutional adapters fell short, despite the speed of static embeddings.

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model distillation

Teacher quality stops mattering when the student is too small

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A better teacher is not a better student. When the student is too small to absorb what the teacher knows (i.e. a small conv model), teacher quality stops mattering.

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retrieval methodology

Raw static token vectors are a poor fit for MaxSim

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Don't score raw static token vectors with MaxSim. It's worse than the standard pooling, the scoring method is technically changing the training target. MaxSim assumes contextualized vectors and static embeddings are not contextual.

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static embedding performance

Static embeddings can be fast on CPU

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Static embedding models can seem like a cheat code at first glance. Embedding a line of text is just a table lookup plus an average calculation. This translates to about 0.05 ms per text line on CPU, no transformer forward pass, it's WASM-friendly, and ~100× faster than even a small dense model.

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