Unsupervised Dimensionality Reduction: UMAP vs t-SNE

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5 years ago 29:34

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Dimensionality reduction redux: this episode covers UMAP, an unsupervised algorithm designed to make high-dimensional data easier to visualize, cluster, etc. It’s similar to t-SNE but has some advantages. This episode gives a quick recap of t-SNE, especially the connection it shares with information theory, then gets into how UMAP is different (many say better). Between the time we recorded and released this episode, an interesting argument made the rounds on the internet that UMAP’s advantages largely stem from good initialization, not from advantages inherent in the algorithm. We don’t cover that argument here obviously, because it wasn’t out there when we were recording, but you can find a link to the paper below. Relevant links: https://pair-code.github.io/understanding-umap/ https://www.biorxiv.org/content/10.1101/2019.12.19.877522v1

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