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This looks like an interesting algo, exploring the use of sampling and GPU to compute truncated SVD (~LSI) quickly:
Sampling Algorithms to Update Truncated SVD. 2017. Yamazaki, I., S. Tomov, and J. Dongarra.
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The core algorithm is similar to what we already have in Gensim (randomized) and expands on it. SVD is such a core algo across all statistics/ML that I think it's worth optimizing our (already fast) implementation further. Especially the BLAS-3 GPU variant looks exciting.