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Word2vec is a widely used algorithm for extracting low-dimensional vector representations of words. State-of-the-art algorithms including those by Mikolov et al. [1], [2] have been parallelized for multi-core CPU architectures, but are based on vector-vector operations with Hogwild updates that are memory-bandwidth intensive and do not efficiently use computational resources. In this paper, we propose HogBatch by improving reuse of various data structures in the algorithm through the use of minibatching and negative sample sharing, hence allowing us to express the problem using matrix multiply operations. We also explore different techniques to distribute word2vec computation across nodes in a computer cluster, and demonstrate good strong scalability up to 32 nodes. The new algorithm is particularly suitable for modern multi-core/many-core architectures, especially Intelu0027s latest Knights Landing processors, and allows us to scale up the computation near linearly across cores and nodes, and process hundreds of millions of words per second, which is the fastest word2vec implementation to the best of our knowledge. We released the source code for reproducible research and general usage.

Parallelizing Word2Vec in Shared and Distributed Memory