热身：一种可行构造，尚未学习 · 实现代码

import os, tempfile
LAB_WORKDIR = tempfile.mkdtemp(prefix='lecture03-')
os.chdir(LAB_WORKDIR)
print('Ephemeral experiment workspace ready')
import numpy as np
h=np.array([[1.,0.],[.7,0.],[0.,1.],[0.,.7]])
y=np.array([0,0,1,1]);z=h.sum(1,keepdims=True)
print('h shape',h.shape,'z shape',z.shape)
print('h color readout',np.argmax(h,1).tolist(),'z',z.ravel().tolist())
print('This is a hand-constructed projection, not learned features.')