Three Components of Machine Learning - Data
Data is the fuel of machine learning methods. We can think of data as collections of many elementary units which we call data points. Data points can represent persons, images, movies, molecules, antenna signal, vibration sensors or random variables.
Each data point is characterized by different properties which we divide into two different types of properties: features and labels. Features are low-level properties that can be measured with low effort. Labels are high-level properties, or quantities of interest, that cannot be measured easily. The ultimate goal of machine learning is to predict the labels of data points based solely on their features.
Read more about how data is used in machine learning in Chapter 2 of http://mlbook.cs.aalto.fi
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