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Tutorial: Linearly separable data

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Tutorial: Linearly separable data[ Edit ]

The idea of linearly separable is easiest to visualize and understand in 2 dimensions. Let the two classes be represented by colors red and green.

A dataset is said to be linearly separable if it is possible to draw a line that can separate the red and green points from each other.

Here are same examples of **linearly separable data**:

And here are some **examples of linearly non-separable data**

This concept can be extended to three or more dimensions as well. For example, below is an **example of a three dimensional dataset that is linearly separable**

**In n dimensions, the separator is a (n-1) dimensional hyperplane - **although it is pretty much impossible to visualize for 4 or more dimensions.

Algebraically, the separator is a linear function, i.e. if data point x is given by (x1, x2), when the separator is a function f(x) = w1*x1 + w2*x2 + b

All points for which f(x) = 0, are on the separator line. All points for which f(x) > 0 are on one side of the line, and all points for which f(x) < 0 are on the other side.

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