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Capturing Structural Locality in Non-parametric Language Models

This repository is a fork of the knnlm repository and the exact commit that this code is based on can be found here. Please use the exact commit page to determine software requirements for using this code. This README will be updated once the code has been merged into Fairseq. This repository is heavily based on fairseq.

Dependencies

Before starting, make sure you install Fairseq (after pulling the code, from the project directory) and FAISS:

pip install --editable .

pip install faiss

Data Preparation

Java: https://zenodo.org/record/3628665 Wikitext: https://blog.einstein.ai/the-wikitext-long-term-dependency-language-modeling-dataset/

Extract locality features: locality_features.

Experiments

For Wikitext-103 experiments, follow wikitext_knn_lm.sh.

For Java experiments, follow bigcode_knn_lm_dynamic.sh.

A Note about Hardware

If your hardware constraints make this too slow, you can run it without using full precision keys by adding two flags: --no-load-keys and --knn-sim-func "do_not_recomp_l2". This uses the quantized versions of keys stored within the FAISS index. You can make things faster by reducing the value of the probe (the number of clusters FAISS checks for neighbors) at the cost of performance. You can also try reducing the number of neighbors k.