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This repo contains the implementation of Parallelized and Distributed HNSW based prediction algorithm using OpenMP and OpenMPI.

Solution to Assignment 3 of the course COL380- Introduction to Parallel and Distributed Programming offered in Second (Holi) Semester 2021-22.

HNSW stands for Hierarchical Navigable Small World graphs. HNSW is designed to reduce the prediction complexity of One-vs-All (OVA) method from O(L) to O(logL). This reduction in complexity is achieved by learning a hierarchical graph structure. More detailshere.

Clone the git repo and run the following commands:

cd Code

This command opens the Code folder.

./compile.sh

This command compiles all the required files.

./DataSetup.sh ./data/path/hnsw/given ./data/path/hnsw/converted

This command is used to convert raw pre-trained HNSW data.

./HNSWpred.sh ./data/path/hnsw/converted K users.bin user_prediction.txt

This command is used to predict top K relevant items in descending order and store them in user_prediction.txt file.