Does sklearn have a patent?

Sklearn (full name Scikit-Learn) is a machine learning tool based on Python language and a commonly used third-party module in machine learning. It is based on NumPy, SciPy, Pandas and Matplotlib. The API inside is very well designed, and the interfaces of all objects are very simple. It encapsulates the commonly used machine learning methods, including regression, dimensionality reduction, classification and clustering.