训练随机森林回归模型 RandomForestRegressor
bootstrap 表示是够有放回抽样，还是不放回抽样
# 训练随机森林回归模型 RandomForestRegressor
from sklearn.ensemble import RandomForestRegressor
from sklearn import datasets
boston = datasets.load_boston()
features = boston.data[:, 0:2]
target = boston.target
# 训练模型 bootstrap 表示是够有放回抽样，还是不放回抽样
randomforest = RandomForestRegressor(random_state=0, n_jobs=-1)
model = randomforest.fit(features, target)
