python不确定预测神器森林算法

import numpy as np
import pylab as pl


x=np.random.uniform(1,100,1000)
y=np.log(x)+np.random.normal(0,.3,1000)

pl.scatter(x,y,s=1,label="log(x) with noise")

pl.plot(np.arange(1,100),np.log(np.arange(1,100)),c="b",label="log(x) true function")
pl.xlabel("x")
pl.ylabel("f(x)=log(x)")
pl.legend(loc="best")
pl.title('A Basic Log Function')
pl.show()