How to use string kernels in scikit-learn?

Question

I am trying to generate a string kernel that feeds a support vector classifier. I tried it with a function that calculates the kernel, something like that

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Answer 1

I think that shogun library could be the solution, is also free and open source, I suggest review this example: https://github.com/shogun-toolbox/shogun/tree/develop/src/shogun/kernel/string