tree_extension_metadata = { '_tree': {'sources': ['_tree.pyx'], 'override_options': ['cython_language=cpp', 'optimization=3']}, '_splitter': {'sources': ['_splitter.pyx'], 'override_options': ['optimization=3']}, '_criterion': {'sources': ['_criterion.pyx'], 'override_options': ['optimization=3']}, '_utils': {'sources': ['_utils.pyx'], 'override_options': ['optimization=3']}, } foreach ext_name, ext_dict : tree_extension_metadata py.extension_module( ext_name, [ext_dict.get('sources'), utils_cython_tree], dependencies: [np_dep], override_options : ext_dict.get('override_options', []), cython_args: cython_args, subdir: 'sklearn/tree', install: true ) endforeach