import?java.util.Random;

/**
?*?BPNN.?
?*
?*?@author?RenaQiu
?*
?*/
public?class?BP?{
????/**
?????*?input?vector.?
?????*/
????private?final?double[]?input;
????/**
?????*?hidden?layer.?
?????*/
????private?final?double[]?hidden;
????/**
?????*?output?layer.?
?????*/
????private?final?double[]?output;
????/**
?????*?target.?
?????*/
????private?final?double[]?target;

????/**
?????*?delta?vector?of?the?hidden?layer?.?
?????*/
????private?final?double[]?hidDelta;
????/**
?????*?output?layer?of?the?output?layer.?
?????*/
????private?final?double[]?optDelta;

????/**
?????*?learning?rate.?
?????*/
????private?final?double?eta;
????/**
?????*?momentum.?
?????*/
????private?final?double?momentum;

????/**
?????*?weight?matrix?from?input?layer?to?hidden?layer.?
?????*/
????private?final?double[][]?iptHidWeights;
????/**
?????*?weight?matrix?from?hidden?layer?to?output?layer.?
?????*/
????private?final?double[][]?hidOptWeights;

????/**
?????*?previous?weight?update.?
?????*/
????private?final?double[][]?iptHidPrevUptWeights;
????/**
?????*?previous?weight?update.?
?????*/
????private?final?double[][]?hidOptPrevUptWeights;

????public?double?optErrSum?=?0d;

????public?double?hidErrSum?=?0d;

????private?final?Random?random;

????/**
?????*?Constructor.?
?????*?
?
?????*?Note:?The?capacity?of?each?layer?will?be?the?parameter?
?????*?plus?1.?The?additional?unit?is?used?for?smoothness.?
?????*?
?
?????*
?????*?@param?inputSize
?????*?@param?hiddenSize
?????*?@param?outputSize
?????*?@param?eta
?????*?@param?momentum
?????*
?????*/
????public?BP（int?inputSize?int?hiddenSize?int?outputSize?double?eta
??????????????double?momentum）?{

????????input?=?new?double[inputSize?+?1];
????????hidden?=?new?double[hiddenSize?+?1];
????????output?=?new?double[outputSize?+?1];
????????target?=?new?double[outputSize?+?1];

????????hidDelta?=?new?double[hiddenSize?+?1];
????????optDelta?=?new?double[outputSize?+?1];

????????iptHidWeights?=?new?double[inputSize?+?1][hiddenSize?+?1];
????????hidOptWeights?=?new?double[hiddenSize?+?1][outputSize?+?1];

????????random?=?new?Random（19881211）;
????????randomizeWeights（iptHidWeights）;
????????randomizeWeights（hidOptWeights）;

????????iptHidPrevUptWeights?=?new?double[inputSize?+?1][hiddenSize?+?1];
????????hidOptPrevUptWeights?=?new?double[hiddenSize?+?1][outputSize?+?1];

????????this.eta?=?eta;
????????this.momentum?=?momentum;
????}

????private?void?randomizeWeights（double[][]?matrix）?{
????????for?（int?i?=?0?len?=?matrix.length;?i?!=?len;?i++）
????????????for?（int?j?=?0?len2?=?matrix[i].length;?j?!=?len2;?j++）?{
????????????????double?real?=?random.nextDouble（）;
????????????????matrix[i][j]?=?random.nextDouble（）?>?0.5???real?:?-real;
????????????}
????}

????/**
?????*?Constructor?with?default?eta?=?0.25?and?momentum?=?0.3.?
?????*
?????*?@param?inputSize
?????*?@param?hiddenS

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2016-12-06?09:30??BP\
?????目錄???????????0??2016-12-06?09:30??BP\.git\
?????文件?????????395??2014-12-19?12:57??BP\.gitattributes
?????文件?????????862??2016-11-30?12:07??BP\.gitignore
?????文件??????????52??2016-11-30?12:07??BP\.git\COMMIT_EDITMSG
?????文件?????????130??2016-11-30?12:07??BP\.git\config
?????文件??????????73??2016-11-30?12:07??BP\.git\description
?????文件??????????23??2016-11-30?12:07??BP\.git\HEAD
?????目錄???????????0??2016-12-06?09:30??BP\.git\hooks\
?????文件?????????177??2016-11-30?12:07??BP\.git\hooks\README.sample
?????文件?????????192??2016-11-30?12:08??BP\.git\index
?????目錄???????????0??2016-12-06?09:30??BP\.git\info\
?????文件?????????113??2016-11-30?12:07??BP\.git\info\exclude
?????目錄???????????0??2016-12-06?09:30??BP\.git\logs\
?????文件?????????203??2016-11-30?12:07??BP\.git\logs\HEAD
?????目錄???????????0??2016-11-30?13:17??BP\.git\logs\refs\
?????目錄???????????0??2016-12-06?09:30??BP\.git\logs\refs\heads\
?????文件?????????203??2016-11-30?12:07??BP\.git\logs\refs\heads\master
?????目錄???????????0??2016-11-30?13:17??BP\.git\objects\
?????目錄???????????0??2016-12-06?09:30??BP\.git\objects\3a\
?????文件?????????474??2016-11-30?12:07??BP\.git\objects\3a\d1de1b526abf834be82e030fab2753e246ec98
?????目錄???????????0??2016-12-06?09:30??BP\.git\objects\93\
?????文件??????????89??2016-11-30?12:07??BP\.git\objects\93\a2db431417e22a68722469bd16dcca8d54cbf0
?????目錄???????????0??2016-12-06?09:30??BP\.git\objects\bd\
?????文件?????????188??2016-11-30?12:07??BP\.git\objects\bd\b0cabc87cf50106df6e15097dff816c8c3eb34
?????目錄???????????0??2016-12-06?09:30??BP\.git\objects\d6\
?????文件?????????159??2016-11-30?12:07??BP\.git\objects\d6\57cec8d82ee5e4080dac3f7e5d51d64f897d39
?????目錄???????????0??2016-11-30?12:07??BP\.git\objects\info\
?????目錄???????????0??2016-11-30?12:07??BP\.git\objects\pack\
?????目錄???????????0??2016-11-30?13:17??BP\.git\refs\
?????目錄???????????0??2016-12-06?09:30??BP\.git\refs\heads\
............此處省略20個文件信息