iris.dt

来自「it is tree Dtree algorithm. so see it. i」· DT 代码 · 共 30 行

/*----------------------------------------------------------------------
  domains
----------------------------------------------------------------------*/
dom(petal_length) = IR [1, 6.9];
dom(petal_width) = IR [0.1, 2.5];
dom(iris_type) = { Iris-setosa, Iris-versicolor, Iris-virginica };

/*----------------------------------------------------------------------
  decision tree
----------------------------------------------------------------------*/
dtree(iris_type) =
{ (petal_length|2.45)
  <:{ Iris-setosa: 50 },
  >:{ (petal_width|1.75)
      <:{ (petal_length|5.35)
          <:{ (petal_length|4.95)
              <:{ Iris-versicolor: 47, Iris-virginica: 1 },
              >:{ (petal_width|1.55)
                  <:{ Iris-virginica: 2 },
                  >:{ Iris-versicolor: 2 }}},
          >:{ Iris-virginica: 2 }},
      >:{ Iris-versicolor: 1, Iris-virginica: 45 }}};

/*----------------------------------------------------------------------
  number of attributes: 3
  tree height         : 6
  number of nodes     : 11
  number of tuples    : 150
----------------------------------------------------------------------*/