# skfolio.model_selection.BaseCombinatorialCV ### *class* skfolio.model_selection.BaseCombinatorialCV Base class for all combinatorial cross-validators. Implementations must define `split` or `get_path_ids`. ### Methods | [`get_path_ids`](#skfolio.model_selection.BaseCombinatorialCV.get_path_ids)() | Return the path id of each test sets in each split. | |-------------------------------------------------------------------|-------------------------------------------------------| | **split** | | |-------------|----| #### *abstractmethod* get_path_ids() Return the path id of each test sets in each split.