%?Version?1.000
%
%?Code?provided?by?Ruslan?Salakhutdinov?and?Geoff?Hinton
%
%?Permission?is?granted?for?anyone?to?copy?use?modify?or?distribute?this
%?program?and?accompanying?programs?and?documents?for?any?purpose?provided
%?this?copyright?notice?is?retained?and?prominently?displayed?along?with
%?a?note?saying?that?the?original?programs?are?available?from?our
%?web?page.
%?The?programs?and?documents?are?distributed?without?any?warranty?express?or
%?implied.??As?the?programs?were?written?for?research?purposes?only?they?have
%?not?been?tested?to?the?degree?that?would?be?advisable?in?any?important
%?application.??All?use?of?these?programs?is?entirely?at?the?user‘s?own?risk.

%?This?program?fine-tunes?an?autoencoder?with?backpropagation.
%?Weights?of?the?autoencoder?are?going?to?be?saved?in?mnist_weights.mat
%?and?trainig?and?test?reconstruction?errors?in?mnist_error.mat
%?You?can?also?set?maxepoch?default?value?is?200?as?in?our?paper.??

maxepoch=200;
fprintf（1‘\nFine-tuning?deep?autoencoder?by?minimizing?cross?entropy?error.?\n‘）;
fprintf（1‘60?batches?of?1000?cases?each.?\n‘）;

load?mnistvh
load?mnisthp
load?mnisthp2
load?mnistpo?

makebatches;
[numcases?numdims?numbatches]=size（batchdata）;
N=numcases;?

%%%%?PREINITIALIZE?WEIGHTS?OF?THE?AUTOENCODER?%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
w1=[vishid;?hidrecbiases];
w2=[hidpen;?penrecbiases];
w3=[hidpen2;?penrecbiases2];
w4=[hidtop;?toprecbiases];
w5=[hidtop‘;?topgenbiases];?
w6=[hidpen2‘;?hidgenbiases2];?
w7=[hidpen‘;?hidgenbiases];?
w8=[vishid‘;?visbiases];

%%%%%%%%%%?END?OF?PREINITIALIZATIO?OF?WEIGHTS??%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

l1=size（w11）-1;
l2=size（w21）-1;
l3=size（w31）-1;
l4=size（w41）-1;
l5=size（w51）-1;
l6=size（w61）-1;
l7=size（w71）-1;
l8=size（w81）-1;
l9=l1;?
test_err=[];
train_err=[];


for?epoch?=?1:maxepoch

%%%%%%%%%%%%%%%%%%%%?COMPUTE?TRAINING?RECONSTRUCTION?ERROR?%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
err=0;?
[numcases?numdims?numbatches]=size（batchdata）;
N=numcases;
?for?batch?=?1:numbatches
??data?=?[batchdata（::batch）];
??data?=?[data?ones（N1）];
??w1probs?=?1./（1?+?exp（-data*w1））;?w1probs?=?[w1probs??ones（N1）];
??w2probs?=?1./（1?+?exp（-w1probs*w2））;?w2probs?=?[w2probs?ones（N1）];
??w3probs?=?1./（1?+?exp（-w2probs*w3））;?w3probs?=?[w3probs??ones（N1）];
??w4probs?=?w3probs*w4;?w4probs?=?[w4probs??ones（N1）];
??w5probs?=?1./（1?+?exp（-w4probs*w5））;?w5probs?=?[w5probs??ones（N1）];
??w6probs?=?1./（1?+?exp（-w5probs*w6））;?w6probs?=?[w6probs??ones（N1）];
??w7probs?=?1./（1?+?exp（-w6probs*w7））;?w7probs?=?[w7probs??ones（N1）];
??dataout?=?1./（1?+?exp（-w7probs*w8））;
??err=?err?+??1/N*sum（sum（?（data（:1:end-1）-dataout）.^2?））;?
??end
?train_err（epoch）=err/numbatches;

%%%%%%%%%%%%%%?END?OF?COMPUTING?TRAINING?RECONSTRUCTION?ERROR?%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%?DISPLAY?FIGURE?TOP?ROW?REAL?DATA?BOTTOM?ROW?RECONSTRUCTIONS?%%%%%%%%%%%%%%%%%%%%%%%%%
fprintf（1‘Displaying?in?figure?1:?Top?row?-?real?data?Bottom?row?--?reconstructions?\n‘）;
output=[];
?for?i

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2016-05-06?14:45??code\
?????文件????????5594??2006-05-21?11:34??code\backprop.m
?????文件????????5474??2006-06-20?09:49??code\backpropclassify.m
?????目錄???????????0??2016-05-06?14:45??code\backup?ZIP\
?????文件???????51200??2016-04-15?10:41??code\backup?ZIP\Autoencoder_Code.tar
?????文件????????8995??2016-04-15?10:41??code\backup?ZIP\minimize.m
?????文件?????1648877??2016-04-15?10:40??code\backup?ZIP\t10k-images-idx3-ubyte.gz
?????文件????????4542??2016-04-15?10:40??code\backup?ZIP\t10k-labels-idx1-ubyte.gz
?????文件?????9912422??2016-04-15?10:39??code\backup?ZIP\train-images-idx3-ubyte.gz
?????文件???????28881??2016-04-15?10:39??code\backup?ZIP\train-labels-idx1-ubyte.gz
?????文件????????1853??2006-06-20?09:49??code\CG_CLASSIFY.m
?????文件????????1136??2006-06-20?09:49??code\CG_CLASSIFY_INIT.m
?????文件????????2727??2006-06-20?09:49??code\CG_MNIST.m
?????文件????????3011??2006-06-20?09:49??code\converter.m
?????文件????????4169??2006-06-20?09:49??code\makebatches.m
?????文件????????8995??2016-04-15?10:41??code\minimize.m
?????文件????????1902??2006-06-20?09:49??code\mnistclassify.m
?????文件????????2199??2006-06-20?09:49??code\mnistdeepauto.m
?????文件????????1084??2006-06-20?09:49??code\mnistdisp.m
?????文件????????3914??2006-06-20?09:49??code\rbm.m
?????文件????????3964??2006-06-20?09:49??code\rbmhidlinear.m
?????文件????????2934??2006-07-13?23:40??code\README.txt
?????文件?????7840016??1998-01-26?23:07??code\t10k-images.idx3-ubyte
?????文件???????10008??1998-01-26?23:07??code\t10k-labels.idx1-ubyte
?????文件????47040016??1996-11-18?23:36??code\train-images.idx3-ubyte
?????文件???????60008??1996-11-18?23:36??code\train-labels.idx1-ubyte