梯度提升: from sklearn.ensemble import GradientBoostingClassifier gb=GradientBoostingClassifier(random_state=0) gb.fit(x_train,y_train) print("Accuracy on training set:{:.3f}".format(gb.score(x_train,y_train))) print("Accuracy on test set:{:.3f
程序如下: # -*- coding: utf-8 -*- """ Created on Sat Oct 31 17:36:56 2015 """ import logging from time import time from numpy.random import RandomState import matplotlib.pyplot as plt import matplotlib.image as mpimg from sklearn
一.介绍 MNIST(Mixed National Institute of Standards and Technology database)是网上著名的公开数据库之一,是一个入门级的计算机视觉数据集,它包含庞大的手写数字图片. 无论我们学习哪门程序语言,我们最开始的一件事就是学习打印"Hello World!".就好比编程入门有Hello World,Tensorflow入门有MNIST,通常把它当做Tensorflow的入门级例程. 从事深度学习的研究,数据集是相当重要的.数据
MNIST是一个标准的手写字符测试集. Mnist数据集对应四个文件: train-images-idx3-ubyte: training set images train-labels-idx1-ubyte: training set labels t10k-images-idx3-ubyte: test set images t10k-labels-idx1-ubyte: test set labels 训练数据集包含60000幅图片,测试集包含10000幅图片. 文件格式: TR