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Table Of Contents
Machine Learning For Dummies
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The driving force behind optimization in machine learning is the response from a function internal to the algorithm, called the cost function. You may see other terms used in some contexts, such as loss function, objective function, scoring function, or error function, but the cost function is an evaluation function that measures how well the machine learning algorithm maps the target function that it’s striving to guess. In addition, a cost function determines how well a machine learning algorithm performs in a supervised prediction or an unsupervised optimization problem.
The evaluation function works by comparing the algorithm predictions against the actual outcome recorded from the real world. Comparing a prediction against its real value using a cost function determines the algorithm’s error level. Because it’s a mathematical formulation, the cost function expresses the error level in a numerical form, thereby keeping errors low. The...
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