如何告诉r2pmml我的变量是什么dataType？

from sklearn.datasets import load_iris
from sklearn.ensemble import RandomForestClassifier
from sklearn2pmml import PMMLPipeline, sklearn2pmml

iris = load_iris()
X = iris.data
y = iris.target

model = RandomForestClassifier(n_estimators=10)
model.fit(X, y)

pipeline = PMMLPipeline([
    ("classifier", model)
])

r2pmml(pipeline, "model.pmml", with_repr=True, debug=True, dataType={
    "sepal length (cm)": "double",
    "sepal width (cm)": "double",
    "petal length (cm)": "double",
    "petal width (cm)": "double"
})