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练习推导一个最简单的BP神经网络训练过程【个人作业/数学推导】

写在前面:

各式资料中关于BP神经网络的讲解已经足够全面详尽,故不在此过多赘述。本文重点在于由一个“最简单”的神经网络练习推导其训练过程,和大家一起在练习中一起更好理解神经网络训练过程。

一、BP神经网络

1.1 简介

BP网络(Back-Propagation Network) 是1986年被提出的,是一种按误差逆向传播算法训练的
多层前馈网络,是目前应用最广泛的神经网络模型之一,用于函数逼近、模型识别分类、数据压
缩和时间序列预测等。
一个典型的BP网络应该包括三层:输入层、隐藏层和输出层。各层之间全连接,同层之间无连接。
隐藏层可以有很多层。
 

图1 BP神经网络参考图

1.2 训练(学习)过程

每一次迭代(Interation)意味着使用一批(Batch)数据对模型进行一次更新过程,被称为“一次训练”,包含一个正向过程和一个反向过程。

具体过程可以概括为如下过程:

  1. 准备样本信息(数据&标签)、定义神经网络(结构、初始化参数、选取激活函数等)
  2. 将样本输入,正向计算各节点函数输出
  3. 计算损失函数
  4. 求损失函数对各权重的偏导数,采用适当方法进行反向过程优化
  5. 重复2~4直至达到停止条件

以下训练将使用均值平方差(Mean Squared Error, MSE)作为损失函数,sigmoid函数作为激活函数、梯度下降法作为优化权重方法进行推导
 

二、实例推导练习作业

2.1 准备工作

图2 所定义神经网络、初始化参数、样本信息等

  1. 第一层是输入层,包含两个神经元: i1, i2 和偏置b1
  2. 第二层是隐藏层,包含两个神经元: h1, h2 和偏置项b2
  3. 第三层是输出: o1, o2
  4. 每条线上标的 wi 是层与层之间连接的权重
  5. 激活函数是 sigmod 函数
  6. 我们用 z 表示某神经元的加权输入和,用 a 表示某神经元的输出

2.2 第一次正向过程【个人推导】

根据上述信息,我们可以得到另一种表达一次迭代的“环形”过程的图示如下:

图3 bp神经网络数量关系“环”图示

 

我们做一次正向过程(由于需多次迭代,因此我们将第一次正向过程标记为t=0),得各项数值如下:

图4 初始数值“环”图示(附函数关系表达式)

由此我们可得损失函数值为MSE=0.298371109,假设这超出了我们对损失值的要求,那么我们就需要对各个权重(wi,t=0)进行更新, 作为t=1的初始权重。

2.3 推导计算∂/∂wi【个人推导】

2.3.1 均值平方差损失函数的全微分推导

2.3.2 这一次代入训练实例的数值和各数量名

d

d

d

dM

d

2.3.3 由此我们得到∂/∂wi的表达式

当然如果你喜欢用矩阵表示也可以:

2.4 根据∂/∂wi梯度下降法优化wi【个人推导】

根据梯度下降法,设置学习率α=0.5,计算出wi,t+1,然后重新进行下一次正向过程。(可以将该过程在Excel中轻易实现,下表中为迭代数据截取)

可以看到,经过10001次迭代之后MSE(t=10001)=3.51019E-05已经足够小,可以停止迭代完成1代训练。

tw1w2w3w4w5w6w7w8zh1zh2ah1ah2zo1zo2ao1ao2MSE/w1/w2/w3/w4/w5/w6/w7/w8
00.150.20.250.30.40.450.50.550.37750.39250.5932699920.5968843781.1059059671.2249214040.751365070.7729284650.2983711090.0004385680.0008771350.0004977130.0009954250.0821670410.082667628-0.02260254-0.022740242
10.1497807160.1995614320.2497511440.2995022870.358916480.4086661860.511301270.5613701210.3774451790.3924377860.5932567640.5968694091.0568499741.2383975890.7420881110.7752849680.2910277740.0003759970.0007519930.0004362580.0008725150.0831252350.083631428-0.022192112-0.022327251
20.1495927180.1991854360.2495330150.299066030.3173538620.3668504720.5223973260.5725337470.3773981790.3923832540.5932454230.5968562871.0072257371.2516301890.7324768710.7775819270.2835471330.0003105250.000621050.0003717880.0007435750.0839872950.084498495-0.021794258-0.021926912
30.1494374550.198874910.2493471210.2986942420.2753602140.3246012250.5332944550.5834972030.3773593640.392336780.5932360560.5968451050.957090261.2646269480.7225388490.7798215830.2759432890.0002423820.0004847650.0003045220.0006090450.0847421490.085257692-0.021408471-0.021538713
40.1493162640.1986325280.249194860.298389720.232989140.2819723790.5439986910.5942665590.3773290660.3922987150.5932287450.5968359450.9065071061.2773953040.7122848770.7820060730.2682327610.0001718570.0003437140.0002347420.0004694840.0853791680.085898326-0.021034266-0.021162167
50.1492303350.1984606710.2490774890.2981549780.1902995560.2390232160.5545158240.6048476430.3773075840.3922693720.5932235610.5968288850.855546141.2899423960.7017292760.7841374390.2604343939.92949E-050.000198590.0001627840.0003255690.0858884510.08641044-0.02067118-0.02079681
60.1491806880.1983613760.2489960970.2979921930.147355330.1958179960.5648514140.6152460480.3772951720.3922490240.5932205660.5968239890.804283091.3022750760.6908899290.7862176260.2525691762.50973E-055.01945E-058.90435E-050.0001780870.0862611270.086785106-0.020318774-0.020442197
70.1491681390.1983362790.2489515750.297903150.1042247670.1524254430.5750108010.6254671460.3772920350.3922378940.5932198090.596821310.7527989491.3143999190.679788270.788248490.244659999-5.02864E-05-0.0001005731.39637E-052.79274E-050.0864896390.087014727-0.019976624-0.020097905
80.1491932830.1983865650.2489445930.2978891860.0609799470.1089180790.5849991130.6355160980.3772983210.3922361480.5932213260.596820890.701179191.3263232330.6684491620.7902318040.236731316-0.000126366-0.000252732-6.19687E-05-0.0001239370.0865680270.087093306-0.019644331-0.01976353
90.1492564660.1985129310.2489755770.2979511550.0176959340.0653714260.5948212790.6453978630.3773141160.3922438940.5932251370.5968227540.6495128281.3380510650.6569006710.7921692570.228808741-0.00020262-0.000405241-0.000138235-0.000276470.0864921560.087016688-0.019321512-0.019438687
100.1493577760.1987155510.2490446950.29808939-0.025550140.0218630820.6044820340.6551172070.3773394440.3922611740.5932312490.5968269120.5978913321.3495892120.6451737280.7940624610.220918592-0.000278511-0.000557022-0.000214296-0.0004285920.0862599080.086782742-0.0190078-0.019123009
110.1494970310.1989940630.2491518430.298303686-0.0686801-0.0215282890.6139859340.6646787110.3773742580.3922879610.593239650.5968333580.5464074421.3609432280.6333016890.7959129540.213087389-0.000353494-0.000706987-0.000289606-0.0005792110.0858712980.086391487-0.018702847-0.018816145
120.1496737780.1993475560.2492966460.298593292-0.11161575-0.0647240320.6233373580.6740867840.3774184450.3923241610.5932503130.5968420680.4951538981.3721184330.6213198050.7977222030.205341328-0.000427033-0.000854067-0.000363625-0.0007272490.0853285240.085845134-0.018406322-0.01851776
130.1498872950.199774590.2494784580.298956916-0.15428001-0.1076465990.6325405190.6833456640.3774718240.3923696150.5932631930.5968530050.4442221531.3831199210.6092646240.7994916060.197705769-0.000498617-0.000997235-0.000435834-0.0008716690.0846359240.085148053-0.018117905-0.018227536
140.1501366040.2002732070.2496963750.299392751-0.19659797-0.1502206250.6415994720.6924594320.3775341510.3924240940.5932782330.5968661140.3937011021.3939525710.5971733460.8012224990.190204742-0.000567769-0.001135538-0.00050575-0.0010114990.0837998730.084306657-0.017837296-0.017945168
150.1504204880.2008409760.249949250.2998985-0.23849791-0.1923739540.650518120.7014320160.3776051220.3924873130.5932953580.5968813250.3436758781.4046210520.585083160.8029161560.182860503-0.000634058-0.001268116-0.000572931-0.0011458620.0828285890.083329217-0.017564203-0.017670364
160.1507375170.2014750340.2502357160.300471431-0.2799122-0.2340385630.6593002210.7102671980.3776843790.3925589290.5933144820.5968985570.2942267571.4151298350.5730305970.8045737930.175693166-0.000697111-0.001394222-0.000636994-0.0012739870.0817318840.082225608-0.017298353-0.017402848
170.1510860730.2021721450.2505542120.301108425-0.32077814-0.2751513660.6679493980.7189686220.3777715180.3926385530.5933355080.5969177160.2454282121.4254832020.561050910.8061965710.168720403-0.000756617-0.001513233-0.000697615-0.0013952290.0805208750.081007013-0.017039481-0.017142355
180.1514643810.2029287620.250903020.30180604-0.36103858-0.3156548730.6764691380.7275397990.3778660950.3927257550.5933583280.5969386970.1973481431.4356852560.5491775320.8077855990.16195725-0.00081233-0.001624661-0.000754537-0.0015090740.0792076530.079685597-0.016787335-0.016888631
190.1518705460.2037410920.2512802880.302560576-0.40064241-0.3554976710.6848628060.7359841150.3779676370.3928200720.5933828280.5969613890.1500472911.4457399290.5374416020.8093419390.155415989-0.000864077-0.001728153-0.000807571-0.0016151420.0778049460.078274171-0.016541677-0.016641436
200.1523025840.2046051690.2516840740.303368147-0.43954488-0.3946347570.6931336440.7443048330.3780756460.3929210180.5934088880.5969856770.1035788631.455650990.525871590.8108666040.149106135-0.000911745-0.001823491-0.000856594-0.0017131880.0763257970.076785853-0.016302276-0.016400538
210.1527584570.2055169140.2521123710.304224741-0.47770778-0.4330276830.7012847820.7525051020.3781896140.3930280930.5934363860.5970114380.0579883421.465422060.5144930250.8123605640.14303449-0.000955291-0.001910582-0.000901548-0.0018030950.0747832440.075233763-0.016068913-0.016165718
220.1532361020.2064722050.2525631440.305126289-0.5150994-0.4706445640.7093192390.7605879610.3783090260.3931407860.5934651960.597038550.0133134841.4750566150.5033283220.813824750.137205276-0.000994725-0.001989449-0.000942431-0.0018848610.0731900540.073630744-0.015841379-0.015936763
230.1537334650.207466930.253034360.306068719-0.55169443-0.5074599360.7172399280.7685563430.3784333660.393258590.5934951940.597066892-0.0304155191.4845579970.4923967060.8152600520.131620316-0.00103011-0.00206022-0.000979294-0.0019585890.0715584810.071989125-0.015619473-0.015713472
240.154248520.208497040.2535240070.307048014-0.58747367-0.5434544990.7250496650.7764130790.378562130.3933810020.5935262590.597096341-0.0731757421.4939294240.4817142230.8166673250.126279262-0.001061555-0.00212311-0.001012236-0.0020244720.069900080.070320531-0.015403004-0.015495654
250.1547792970.2095585950.2540301250.30806025-0.62242371-0.5786147640.7327511670.7841609060.3786948240.3935075310.5935582720.59712678-0.1149511121.5031739930.4712938250.8180473890.121179847-0.001089203-0.002178406-0.001041389-0.0020827770.0682255640.06863574-0.015191788-0.015283122
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410.1641676820.2283353630.2631193280.326238655-1.07314462-1.0320372810.8431583940.8952298270.381041920.3957798320.5941243770.597673298-0.6544025061.6359959190.3419981290.8369893650.066817506-0.001178915-0.002357831-0.001151733-0.0023034650.0443878250.04465297-0.012403232-0.012477321
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990.1908556280.2817112560.2894469090.378893818-1.80610603-1.7693549051.1168896641.1705871470.3877139070.4023617270.5957322480.599254958-1.5362503051.9668473420.1770810310.8772720830.020311827-0.000692763-0.001385525-0.000687868-0.0013757360.0145046540.014590424-0.007230366-0.007273121
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
99900.3784725750.656945150.4772631930.754526387-3.892695938-3.8681338052.8615282522.925404640.4346181440.4493157980.6069758980.610476547-4.1241775784.1227696020.0159192710.9840586573.51687E-05-7.48678E-06-1.49736E-05-7.5066E-06-1.50132E-055.62851E-055.66097E-05-5.65721E-05-5.68983E-05
99910.3784763180.6569526370.4772669470.754533893-3.892724081-3.868162112.8615565382.9254330890.434619080.4493167370.6069761210.61047677-4.1242136714.122805430.0159187050.9840592193.5162E-05-7.48587E-06-1.49717E-05-7.50568E-06-1.50114E-055.62778E-055.66024E-05-5.65648E-05-5.6891E-05
99920.3784800610.6569601230.4772706990.754541399-3.892752219-3.8681904112.8615848212.9254615350.4346200150.4493176750.6069763440.610476993-4.124249764.1228412530.015918140.9840597813.51553E-05-7.48496E-06-1.49699E-05-7.50477E-06-1.50095E-055.62705E-055.6595E-05-5.65575E-05-5.68837E-05
99930.3784838040.6569676080.4772744520.754548904-3.892780355-3.8682187082.8616130992.9254899770.4346209510.4493186130.6069765670.610477216-4.1242858444.1228770720.0159175750.9840603433.51486E-05-7.48405E-06-1.49681E-05-7.50385E-06-1.50077E-055.62631E-055.65876E-05-5.65502E-05-5.68763E-05
99940.3784875460.6569750920.4772782040.754556407-3.892808486-3.8682470022.8616413752.9255184150.4346218860.4493195510.606976790.610477439-4.1243219244.1229128860.0159170090.9840609053.51419E-05-7.48314E-06-1.49663E-05-7.50294E-06-1.50059E-055.62558E-055.65803E-05-5.65429E-05-5.6869E-05
99950.3784912870.6569825750.4772819550.75456391-3.892836614-3.8682752922.8616696462.9255468490.4346228220.4493204890.6069770140.610477662-4.1243579994.1229486960.0159164440.9840614673.51352E-05-7.48222E-06-1.49644E-05-7.50203E-06-1.50041E-055.62485E-055.65729E-05-5.65356E-05-5.68617E-05
99960.3784950280.6569900570.4772857060.754571412-3.892864738-3.8683035792.8616979142.925575280.4346237570.4493214270.6069772370.610477885-4.1243940694.1229845010.0159158790.9840620283.51286E-05-7.48131E-06-1.49626E-05-7.50111E-06-1.50022E-055.62412E-055.65656E-05-5.65283E-05-5.68543E-05
99970.3784987690.6569975380.4772894570.754578914-3.892892859-3.8683318612.8617261782.9256037070.4346246920.4493223640.606977460.610478108-4.1244301344.1230203020.0159153140.984062593.51219E-05-7.4804E-06-1.49608E-05-7.5002E-06-1.50004E-055.62339E-055.65582E-05-5.6521E-05-5.6847E-05
99980.3785025090.6570050190.4772932070.754586414-3.892920976-3.8683601412.8617544392.9256321310.4346256270.4493233020.6069776830.610478331-4.1244661954.1230560980.015914750.9840631513.51152E-05-7.47949E-06-1.4959E-05-7.49929E-06-1.49986E-055.62266E-055.65509E-05-5.65138E-05-5.68397E-05
99990.3785062490.6570124980.4772969560.754593913-3.892949089-3.8683884162.8617826952.9256605510.4346265620.4493242390.6069779060.610478554-4.1245022524.1230918890.0159141850.9840637123.51085E-05-7.47858E-06-1.49572E-05-7.49837E-06-1.49967E-055.62193E-055.65435E-05-5.65065E-05-5.68324E-05
100000.3785099880.6570199770.4773007060.754601411-3.892977199-3.8684166882.8618109492.9256889670.4346274970.4493251760.6069781290.610478777-4.1245383034.1231276760.015913620.9840642743.51019E-05-7.47767E-06-1.49553E-05-7.49746E-06-1.49949E-055.6212E-055.65362E-05-5.64992E-05-5.6825E-05

 

 

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