pub fn classifier(dataset: ZList(Map(String, String)), discrete_attributes: ZList(
    String,
  ), class: String) -> fn(Map(String, String)) -> String

pub fn decision_tree(dataset: ZList(Map(String, String)), attributes: ZList(
    String,
  ), class: String) -> ZList(Map(String, String))

pub fn entropy_with_size(dataset: ZList(Map(String, String)), class_attr: String) -> #(
  Float,
  Int,
)

pub fn feature_entropy(dataset: ZList(Map(String, String)), class_attr: String, feature: String, dataset_size: Int) -> Float