Introduction to Classification & Clustering Villanova University Machine Learning Project

Introduction to Classification & Clustering Machine Learning Getting a computer to learn from data A type of Artificial Intelligence, where a computer does something "intelligent" Ability of a computer to improve what it does in a way that mimics how humans learn, like with repetition or experience Villanova University Machine Learning Project Introduction to Classification & Clustering

Examples of Machine Learning Face detection used by Facebook to help you automatically tag friends Spam filters that get better over time at identifying and trashing spam emails Fraud detection that notices suspicious patterns of credit card use and you get a call Optical character recognition that reads the numbers written on a check you deposit Villanova University Machine Learning Project Introduction to Classification & Clustering

Classification & Clustering Two ways to put things into categories Classification Categories already exist Put each thing into the category where it fits best Clustering Categories don’t yet exist Put the things into brand new categories based on similar characteristics or features of the things Villanova University Machine Learning Project Introduction to Classification & Clustering

Introduction to Classification & Clustering Some of the things being put into groups are already labeled with their "class." These class labels are used to guide or supervise the classification of unlabeled things into one of the classes. When the classes are known ahead of time this type of machine learning is called: Supervised Learning Villanova University Machine Learning Project Introduction to Classification & Clustering

Example: Classification Dogs Cats Classify the photos on the next slide into one of these two categories Villanova University Machine Learning Project Introduction to Classification & Clustering

Example: Classification Villanova University Machine Learning Project Introduction to Classification & Clustering

How Did Classification Work? How did you approach the task? What made it easy to do? What made it hard to do? How good are your final categories? Villanova University Machine Learning Project Introduction to Classification & Clustering

Unsupervised Learning Introduction to Classification & Clustering None of the things being put into groups already have their class labels so the grouping is unsupervised. The task becomes figuring out clusters of things with similar features. When the classes are unknown ahead of time this type of machine learning is called: Unsupervised Learning Villanova University Machine Learning Project Introduction to Classification & Clustering

Introduction to Classification & Clustering Example: Clustering Group 1 Group 2 Cluster the photos on the next slide into two categories. You decide! Villanova University Machine Learning Project Introduction to Classification & Clustering

Introduction to Classification & Clustering Example: Clustering Villanova University Machine Learning Project Introduction to Classification & Clustering

How Did Clustering Work? How did you approach the task? What made it easy to do? What made it hard to do? How does it compare with Classification? How good are your final categories? Villanova University Machine Learning Project Introduction to Classification & Clustering

Example: Clustering Again! Group 1 Group 2 Group 3 Cluster the photos on the next slide into three categories. You decide! Villanova University Machine Learning Project Introduction to Classification & Clustering

Introduction to Classification & Clustering Example: Clustering Villanova University Machine Learning Project Introduction to Classification & Clustering

How Did Clustering Work? How did you create categories? Did it get harder to do with more categories? How good are your results? Villanova University Machine Learning Project Introduction to Classification & Clustering