skl2onnx: Convert Scikit-learn Models to ONNX

skl2onnx is a Python library that enables the conversion of scikit-learn machine learning models and pipelines into the ONNX (Open Neural Network Exchange) format. This conversion allows for improved model portability across different runtimes and often leads to enhanced inference performance, especially with ONNX Runtime. The library is actively maintained with frequent releases, typically on a monthly or bi-monthly cadence, and is currently at version 1.20.0.