摘要：import numpy as np #将数据降维的函数，输出值一定在-1~1之间，可以定性（男/女） def sigmoid(x): return 1 / (1 + np.exp(-x)) def deriv_sigmoid(x): fx = sigmoid(x) return fx * (1 - 阅读全文

摘要：Meet your new best friend, Pareto - The Pareto principle states that for most things, 80% of the results come from 20% of the causes. Before you even 阅读全文

摘要：前文提要 上章我们建立了模型来拟合数据，这章我们将检验模型。 Model-Validation(check accuracy,验证) You've built a model. But how good is it? In this lesson, you will learn to use mod 阅读全文