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Cost Function

cost function - measures the accuracy of our hypothesis function hθ(x)

cost function

This function is also called the squared error cost function or mean squared error.

We want hθ(x) - y to be small.

We minimize the cost function J(θ0θ1) over θ0θ1. J(θ0θ1) is a parabolic function. Minimizing it means finding the value of θ1.