手写数字的数据集MNIST的一个小程序和试验结果分析

最新推荐文章于 2022-09-15 10:07:27 发布

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最新推荐文章于 2022-09-15 10:07:27 发布

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分类专栏： python3 文章标签： python3学习手写数字的数据MNIST

本文链接：https://blog.youkuaiyun.com/qq_31248551/article/details/89893775

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import numpy as np
import matplotlib.pyplot as plt

import scipy.special
import datetime

class neuralNetwork:
    def __init__(self, inputnodes, hiddennodes, outputnodes,learningrate):
        self.inodes = inputnodes
        self.hnodes = hiddennodes
        self.onodes = outputnodes
        self.with1 = np.random.normal(0.0,pow(self.hnodes,-0.5),(self.hnodes,self.inodes))
        self.who = np.random.normal(0.0,pow(self.onodes,-0.5),(self.onodes,self.hnodes))
        self.lr = learningrate
 
        self.activation_function = lambda x: scipy.special.expit(x)
        pass
    def train(self,inputs_list,targets_list):
        inputs = np.array(inputs_list,ndmin=2).T
        targets = np.array(targets_list,ndmin=2).T
        hidden_inputs = np.dot(self.with1,inputs)
        hidden_outputs = self.activation_function(hidden_inputs)
        
        final_inputs = np.dot(self.who,hidden_outputs)