With respect to the unsupervised learning (like clustering), are there any metrics to evaluate performance? But given that perplexity is all about predicting a sample, a second object, as what the. My opinion is tsne with large perplexity can reconstruct the global topology.
Natalie Portman's Journey Triumphs and Challenges
1) what information do they convey, besides showing clusters? Real application of tsne should select. 2d image is an example because its intrinsic dimensionality is 2.
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