%%?Deep?learning?for?classification?on?the?MNIST?dataset
%?Copyright?2018?The?MathWorks?Inc.

%%?Prepare?the?dataset
%準備數據集
%?The?MNIST?dataset?is?a?set?of?handwritten?digits?categorized?0-9?and?is
%?available?at?http://yann.lecun.com/exdb/mnist/.

%MNIST數據集是一組手寫數字，分類為0-9，可以在http://yann.lecun.com/exdb/mnist/上找到。

%?The?following?line?will?download?（if?necessary）?and?prepare?the?dataset
%?to?use?in?MATLAB.

%如有必要，下面的代碼行將下載并準備好在MATLAB中使用的數據集。
[imgDataTrain?labelsTrain?imgDataTest?labelsTest]?=?prepareData;

%%?Let‘s?look?at?a?few?of?the?images
%讓我們看一些圖片
%?Randomize?the?images?for?display
%隨機顯示圖像
warning?off?images:imshow:magnificationMustBeFitForDockedFigure
perm?=?randperm（numel（labelsTrain）?25）;
subset?=?imgDataTrain（::1perm）;
montage（subset）

%%?How?do?we?classify?a?digit?
%我們如何對數字進行分類?
%?First?we?need?a?model?-?let‘s?load?one
load?MNISTModel

%?Predict?the?class?of?an?image
%預測圖像的類別
randIndx?=?randi（numel（labelsTest））;
img?=?imgDataTest（::1randIndx）;
actualLabel?=?labelsTest（randIndx）;

predictedLabel?=?net.classify（img）;
imshow（img）;
title（[‘Predicted:?‘?char（predictedLabel）?‘?Actual:?‘?char（actualLabel）]）

%%?Need?a?starting?point??Check?the?documentation!
%需要一個起點?檢查文檔!
%?search?“deep?learning“
%搜索“深度學習”
web（fullfile（docroot?‘nnet/deep-learning-training-from-scratch.html‘））


%%?Prepare?the?CNN
%?One?of?the?simplest?possible?convnets?it?contains?one?convolutional
%?layer?one?ReLU?one?pooling?layer?and?one?fully?connected?layer
%一個最簡單的卷積網絡，它包含一個卷積層，一個ReLU，一個池化層，和一個完全連接的層
layers?=?[??imageInputlayer（[28?28?1]）
????????????convolution2dlayer（520）
????????????relulayer
????????????maxPooling2dlayer（2?‘Stride‘?2）
????????????fullyConnectedlayer（10）
????????????softmaxlayer
????????????classificationlayer（）???]
????????
%%?Attempt?1:?Set?training?options?and?train?the?network
%%嘗試1:設置訓練選項并訓練網絡
????
????miniBatchSize?=?8192;
????options?=?trainingOptions（?‘sgdm‘...
????????‘MiniBatchSize‘?miniBatchSize...
????????‘Plots‘?‘training-progress‘）;

????net?=?trainNetwork（imgDataTrain?labelsTrain?layers?options）;
????

%%?Attempt?2:?Change?the?learning?rate
%嘗試2:改變學習速度

????options?=?trainingOptions（?‘sgdm‘...
????????‘MiniBatchSize‘?miniBatchSize...
????????‘Plots‘?‘training-progress‘...
????????‘InitialLearnRate‘?0.0001）;

????net?=?trainNetwork（imgDataTrain?labelsTrain?layers?options）;

%%?Attempt?3:?Change?the?network?architecture
%嘗試3:更改網絡架構
layers?=?[
????imageInputlayer（[28?28?1]）

????convolution2dlayer（316‘Padding‘1）
????batchNormalizationlayer
????relulayer

????maxPooling2dlayer（2‘Stride‘2）

????convolution2dlayer（332‘Padding‘1）
????batchNormalizationlayer
????relulayer

????maxPooling2dlayer（2‘Stride‘2）

????convolution2dlayer（364‘Padding‘1）
????batchNormalizationlayer
????relulayer

????fullyConnectedlayer（10）
????softmaxlayer
????classificationlayer];

????options?=?trainingOptions（?‘sgdm‘

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????505??2018-05-02?10:43??Demo1_MNIST\letterW.png

?????文件?????211842??2018-05-02?10:43??Demo1_MNIST\MNISTModel.mat

?????文件???????3727??2019-04-24?11:25??Demo1_MNIST\MNIST_Classification_Demo.m

?????文件?????828512??2018-05-02?10:43??Demo1_MNIST\MNIST_Classification_Demo_Live.html

?????文件?????503833??2018-05-02?10:43??Demo1_MNIST\MNIST_Classification_Demo_Live.mlx

?????文件???????3508??2019-04-24?10:20??Demo1_MNIST\prepareData.m

?????目錄??????????0??2019-04-25?11:14??Demo1_MNIST

-----------?---------??----------?-----??----

??????????????1551927????????????????????7