Some algorithms are "how-to" examples

In our Contributing Guidelines:

Algorithms in this repo should not be how-to examples for existing Python packages. Instead, they should perform internal calculations or manipulations to convert input values into different output values. Those calculations or manipulations can use data types, classes, or functions of existing Python packages but each algorithm in this repo should add unique value.

And after some investigation like #6201, one can find some implementations that resemble online tutorials or are too trivial. In #6201, machine_learning/support_vector_machines.py is removed. It should be migrated to a much detailed implementation of SVM instead of importing packages.

Migration list:

• machine_learning/support_vector_machines.py