ate[Unsupervised learning] learns relationships and structure using only .hi-purple[inputs] `\(\left( \color{#6A5ACD}{x_{1},\, \ldots,\, x_{p}} \right)\)` without any *supervising* output — letting the data "speak for itself."

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&lt;img src="images/comic-learning.jpg" style="display: block; margin: auto;" /&gt;

.it[.smaller[[Source](https://twitter.com/athena_schools/status/1063013435779223553)]]

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# Statistical learning

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## Classification vs. Re