1.17.0

• Upgrade the maximum supported opset to 21, update requirements to scikit-learn>=1.1, older versions are not tested anymore, #1098
• Support infrequent categories for OneHotEncoder #1029
• Support kernel Matern in Gaussian Process #978
• Fix for multidimensional gaussian process #1097
• Minor fixes to support scikit-learn==1.5.0 #1095
• Fix the conversion of pipeline including pipelines, issue #1069, #1072
• Fix unexpected type for intercept in PoissonRegressor and GammaRegressor #1070
• Add support for scikit-learn 1.4.0, #1058, fixes issues Many examples in the gallery are showing "broken", TFIDF vectorizer target_opset issue, Tfidfvectorizer with sublinear_tf fails, despite opset version set to greater than 11.