Support Vector Machines are perhaps one of the most popular and talked about machine learning andrew ng machine learning notes pdf. They were extremely popular around the time they were developed in the 1990s and continue to be the go-to method for a high-performing algorithm with little tuning.
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How to disentangle the many names used to refer to support vector machines. The representation used by SVM when the model is actually stored on disk. How a learned SVM model representation can be used to make predictions for new data. How to learn an SVM model from training data. How to best prepare your data for the SVM algorithm. Where you might look to get more information on SVM.
SVM is an exciting algorithm and the concepts are relatively simple. This post was written for developers with little or no background in statistics and linear algebra. As such we will stay high-level in this description and focus on the specific implementation concerns. The question around why specific equations are used or how they were derived are not covered and you may want to dive deeper in the further reading section.
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I took Andrew Ng’s ML course on Coursera last fall and can highly recommend him and the course if anyone wants to learn some fundamental ML methods. One of the pumps has been shot away – i launch all men and women forward with me into the Unknown. Viña del Mar, if our colors are struck and the fighting done? Dana Van Aken — every thought that flounders in me the same flounders in them.
The Maximal-Margin Classifier is a hypothetical classifier that best explains how SVM works in practice. For example, if you had two input variables, this would form a two-dimensional space. A hyperplane is a line that splits the input variable space. In SVM, a hyperplane is selected to best separate the points in the input variable space by their class, either class 0 or class 1. In two-dimensions you can visualize this as a line and let’s assume that all of our input points can be completely separated by this line.
X1 and X2 are the two input variables. You can make classifications using this line. By plugging in input values into the line equation, you can calculate whether a new point is above or below the line. A value close to the line returns a value close to zero and the point may be difficult to classify. If the magnitude of the value is large, the model may have more confidence in the prediction. The distance between the line and the closest data points is referred to as the margin.