University of Michigan - Ann Arbor

Clustering tries to place unlabeled samples into groups based on similar characteristics. 
An example, these samples can be distinguished into 5 categories by some observed characteristic. Let's say we are clustering textbook samples by different school subjects (math, science, history, english, art). 
![The image from the cited reference](https://firebasestorage.googleapis.com/v0/b/onecademy-1.appspot.com/o/UploadedImages%2FMadeline-Rosenberg_Wed%2C%2019%20Feb%202020%2015%3A27%3A54%20GMT.png?alt=media&token=5b890a1d-803b-4ad5-a65f-1ec4043225c2) 

Clustering, an unsupervised statistical learning method

Machine Learning Yearning, a free ebook from Andrew Ng, teaches you how to structure Machine Learning projects.
https://www.deeplearning.ai/machine-learning-yearning/

Note: The content of the book is aligned with the Coursera Deeplearning.ai specialization.  https://www.deeplearning.ai/deep-learning-specialization/ 

Machine Learning Yearning (Deeplearning.ai)

- K-means clustering
- Hierarchical clustering

Method of clustering in unsupervised statistical learning

https://towardsdatascience.com/semantic-similarity-classifier-and-clustering-sentences-based-on-semantic-similarity-a5a564e22304

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