专利详细信息

一种协同过滤推荐模型中调整学习速率的方法

文献类型：专利

专利类型：发明专利

是否失效：否

是否授权：否

申请号：CN201210168756.8

申请日：20120528

发明人：罗辛陈鹏夏云霓吴磊杨瑞龙

申请人：重庆大学成都国科海博计算机系统有限公司

申请人地址：400045 重庆市沙坪坝区沙正街174号

公开日：20121010

公开号：CN102722552A

代理人：郭云

代理机构：重庆市前沿专利事务所

语　　种：中文

摘　　要：本发明公开了一种协同过滤推荐模型中调整学习速率的方法，属于数据挖掘和个性化推荐技术领域，通过增大该隐特征向量对应的学习速率来提高收敛速度，通过缩小该隐特征向量对应的学习速率，从而提高推荐准确率，本发明能够使推荐模型的准确率及收敛速度达到一个较好的平衡状态，使推荐模型的训练过程得到优化。

主权项：1.一种协同过滤推荐模型中调整学习速率的方法，其特征在于按以下步骤进行：步骤一、定义并计算学习速率放大比例因子和缩小比例因子；建立学习速率与用户隐特征向量的对应关系、建立学习速率与项目隐特征向量的对应关系；设定学习速率的放大比例因子α；通过sigmoid函数定义0＜η₀＜1；设定学习速率的缩小比例因子β，β＝α^-1；设定用户隐特征向量为P，P为m×f的矩阵，m为用户数，f为隐特征向量空间的维数，P_u，k是P中第u行、第k列的元素；对于所有的P_u，k{1≤u≤m,1≤k≤f}建立学习速率η_u，k，初始化η_u，k＝η₀，m、f均为正整数；设定项目隐特征向量为Q，Q为n×f的矩阵，n为项目数，f为隐特征向量空间的维数，q_i，k是Q中第i行、第k列的元素；对于所有的q_i，k{1≤i≤n，1≤k≤f}建立学习速率η_i，k，初始化η_i，k＝η₀，n为正整数；步骤二、计算用户隐特征向量或/和项目隐特征向量在训练时刻t的学习方向；对于用户隐特征向量P_u，k和项目隐特征向量q_i，k，其在训练时刻t对应的训练评分数据为r_u，i；P_u，k在训练时刻t的学习方向为 $<math> <mrow> <msubsup> <mi>d</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>k</mi> </mrow> <mi>t</mi> </msubsup> <mo>=</mo> <mrow> <mo>(</mo> <msub> <mi>r</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>i</mi> </p><p class='subject'><strong>关键词：</strong><b class='type_ico_id'></b>学习速率推荐 <b class='type_ico_id'></b>特征向量准确率 <b class='type_ico_id'></b>个性化推荐 <b class='type_ico_id'></b>平衡状态 <b class='type_ico_id'></b>数据挖掘 <b class='type_ico_id'></b>协同过滤训练优化 </p><p class='class'><strong>IPC专利分类号：</strong>G06F17/30(20060101)</p>
</div>

<div class="article_relate_list">
<div>
<h2 name="ckwx" id="ckwx">
参考文献：</h2>
<div id="listckwx">
<p class='submit'>
<img src='/images_new/loading.gif' width='16' height='16' />
正在载入数据...</p>
</div>
</div>
<div>
<h2 name="2jckwx" id="2jckwx">
二级参考文献：</h2>
<div id="list2jckwx">
<p class='submit'>
<img src='/images_new/loading.gif' width='16' height='16' />
正在载入数据...</p>
</div>
</div>
<div>
<h2 name="ohwx" id="ohwx">
耦合文献：</h2>
<div id="listohwx">
<p class='submit'>
<img src='/images_new/loading.gif' width='16' height='16' />
正在载入数据...</p>
</div>
</div>
<div>
<h2 name="yzwx" id="yzwx">
引证文献：</h2>
<div id="listyzwx">
<p class='submit'>
<img src='/images_new/loading.gif' width='16' height='16' />
正在载入数据...</p>
</div>
</div>
<div>
<h2 name="2jyzwx" id="2jyzwx">
二级引证文献：</h2>
<div id="list2jyzwx">
<p class='submit'>
<img src='/images_new/loading.gif' width='16' height='16' />
正在载入数据...</p>
</div>
</div>
<div>
<h2 name="tbywx" id="tbywx">
同被引文献：</h2>
<div id="listtbywx">
<p class='submit'>
<img src='/images_new/loading.gif' width='16' height='16' />
正在载入数据...</p>
</div>
</div>

</div>
</div>
<div class="r">

</div>
<div class="clear">
</div>
</div>
</div>
<div class="vlink_layer" style="display: none">
<div class="vlink">
<img src="/template/t1/images/loading2.gif" width="64" height="64">
<span style="font-size:22px;vertical-align:middle;margin-left:20px;">正在为您导引到下载地址...</span>
</div>
<div id="vlink" style="display: none"></div>
</div>

<script type="text/javascript" src="/Template/t5/js/article_relative.min.js"></script>
<script type="text/javascript" src="/js/articlevlink.min.js"></script>

<div class="foot">
<div class="inner">
<p style="text-align: center;">
版权所有©重庆科技学院
<script type="text/javascript">
document.write("2001-" + new Date().getFullYear());
</script>
重庆维普资讯有限公司 <a target="_blank" href="https://beian.miit.gov.cn/#/Integrated/recordQuery">渝B2-20050021-7</a><br />
　<a target="_blank" href="http://www.beian.gov.cn/portal/registerSystemInfo?recordcode=50019002500408"><img style="position:relative; top:5px; margin-right:3px;" src="/images_new/ghs.png" /><span style="color:inherit;">渝公网安备 50019002500408号</span></a>　违法和不良信息举报中心
<p>
</div>
</div>
<a id="backtop" style="display: none" href="javascript:void(0)" title="返回顶部"></a>
<script type="text/javascript">

$(function () {

$('#backtop').hover(function () {
$(this).css({ opacity: 1 });
},
function () {
$(this).css({ opacity: 0.8 });
});

$('#backtop').click(function () {
$('html,body').animate({ scrollTop: 0 }, 100);
});

$(window).scroll(function () {
var scroH = document.documentElement.scrollTop + document.body.scrollTop;
if (scroH > $('.head').height()) {
$('#backtop').show();
} else {
$('#backtop').hide();
}
});
});

/**google代码*/
$(function () {
// (function (i, s, o, g, r, a, m) {
// i['GoogleAnalyticsObject'] = r; i[r] = i[r] || function () {
// (i[r].q = i[r].q || []).push(arguments);
// }, i[r].l = 1 * new Date(); a = s.createElement(o),
//m = s.getElementsByTagName(o)[0]; a.async = 1; a.src = g;
// m.parentNode.insertBefore(a, m);
// })(window, document, 'script', '//www.google-analytics.com/analytics.js', 'ga');
// ga('create', 'UA-2219013-35', 'cqvip.com');
// ga('send', 'pageview');
});

</script>


<script type="text/javascript">
$(function () {
var urlPath = location.href;
var request = g_getUrlParms();

//当检索条件不为空时，为检索框赋值
if (!request.q) {
$("#artcleSearchCondtion").val("");
} else {
var json1 = JSON.parse(request["q"]);
if (!request.invokemethod&&json1.ajaxKeys && urlPath && urlPath.indexOf("articles.aspx")!=-1) {
$("#artcleSearchCondtion").val(decodeURI(json1.ajaxKeys).replace(/\+/g, " "));
$("#dropSearchFieldName").find("option[showField='"+json1.customShowCondition.split('=')[0]+"']").prop("selected","selected");
} else {
$("#artcleSearchCondtion").val("");
}
}

$("#dropSearchFieldName").easySelectBox();

$("#artcleSearchCondtion").keydown(function (event) {
var e = $.event.fix(event);
if (e.keyCode == 13) {
$("#artcleSearchBtn").click();
return false;
}
});

$("#artcleSearchBtn").click(function () {
var fieldValue = $("#artcleSearchCondtion").val();
if (!fieldValue) {
alert("检索内容不能为空！");
} else {
var condition = {};
var fieldName= $("#dropSearchFieldName").val();
var tempField = fieldName.split("@");
var tempFieldName = tempField[0].split("|");

if (tempFieldName[0] == "multiple") //期刊题名或关键词检索条件拼接
{
condition.customRules = "(" + getSearchRules("title_c", fieldValue) + " OR " + getSearchRules("title_e", fieldValue) + " OR " + getSearchRules("keyword_e", fieldValue) + " OR " + getSearchRules("keyword_c", fieldValue) + " OR " + getSearchRules("subject_text", fieldValue) + ")";
}
else {
if (tempFieldName.length == 1) { //当检索规则只含有一个字段
condition.customRules = getSearchRules(tempFieldName, fieldValue);
} else {
var flag = true;
var customStr = "(";
for (var i = 0; i < tempFieldName.length; i++) { //按检索规则字段个数，循环拼接检索条件，此处各字段间为OR关系
if (flag) {
customStr += getSearchRules(tempFieldName[i], fieldValue);
} else {
customStr += " OR " + getSearchRules(tempFieldName[i], fieldValue);
}
flag = false;
}
customStr += ")";
condition.customRules = customStr;
}
}
condition.customShowCondition = tempField[1] + "=" + fieldValue;
condition.ajaxKeys = fieldValue;

location.href = "/3233/articles.aspx?q=" + encodeURIComponent(JSON.stringify(condition));
if (window.event)
window.event.returnValue = false; //ie6fix
}
});
});
/**返回格式化的搜索规则*/
function getSearchRules(fieldName, fieldValue) {
var returnValue = "";
if (fieldName == "worknumber") {
$.ajax({
type: "get",
url: "/ajax/WriterIdByWorkNumber.ashx",
data: { "organid": "" + $('#hidGlobalOrganID').val() + "", "number": "" + fieldValue + "", "_t": new Date },
dataType: 'text',
async: false,
success: function (msg) {
if (!msg) {
msg = "0";
}
returnValue = "({0}:\"{1}\")".format("writerids_s", msg);
}
});
} else {
returnValue = fieldName == "ALL" ? "({0}:\"{1}\")".format(fieldName, fieldValue.toLowerCase()) : "({0}:\"{1}\")".format(fieldName, fieldValue.toLowerCase());
}
return returnValue;
}
</script>

<div class="layer_bg" style="display: none" id="serLayerBg">
</div>
<div class="advance_layer" style="display: none; top: 150px;" id="serAdvanceLayer">
<form>
<div class="advance">
<h6>
<tt class="close" onclick=" g_HideAdvanceSearch(); ">
<img alt="x" src="/Template/t5/images/advance-close.gif"></tt>
</h6>
<div class="cnt" id="cnt1">
<div class="sinput_top">
<div class="sel">
<input type="hidden" id="hfldFieldNameArticles0" name="hfldFieldNameArticles" />
<select name="dropAdvanceSearchFieldName" style="display: none">
</select>
</div>
<div class="input">
<input type="text" name="txtSearchArticles" id="txtSearchArticles0" maxlength="50"/>
</div>
</div>
<div class="sinput">
<div class="s">
<input type="hidden" value=" AND | 与 " name="hfldRelationArticles" id="hfldRelationArticles1" />
<select name="dropAdvanceSearchLogic">
<option value=" AND | 与 ">与</option>
<option value=" OR | 或 ">或</option>
<option value="AND NOT | 非 ">非</option>
</select>
</div>
<div class="sel">
<input type="hidden" id="hfldFieldNameArticles1" name="hfldFieldNameArticles" />
<select name="dropAdvanceSearchFieldName" style="display: none">
</select>
</div>
<div class="input">
<input type="text" name="txtSearchArticles" id="txtSearchArticles1" maxlength="50"/>
</div>
</div>
<div class="sinput" style="display: none">
<div class="s">
<input type="hidden" value=" AND | 与 " name="hfldRelationArticles" id="hfldRelationArticles2" />
<select name="dropAdvanceSearchLogic">
<option value=" AND | 与 ">与</option>
<option value=" OR | 或 ">或</option>
<option value="AND NOT | 非 ">非</option>
</select>
</div>
<div class="sel">
<input type="hidden" id="hfldFieldNameArticles2" name="hfldFieldNameArticles" />
<select name="dropAdvanceSearchFieldName" style="display: none">
</select>
</div>
<div class="input">
<input type="text" name="txtSearchArticles" id="txtSearchArticles2" maxlength="50"/>
</div>
</div>
<div class="sinput" style="display: none">
<div class="s">
<input type="hidden" value=" AND | 与 " name="hfldRelationArticles" id="hfldRelationArticles3" />
<select name="dropAdvanceSearchLogic">
<option value=" AND | 与 ">与</option>
<option value=" OR | 或 ">或</option>
<option value="AND NOT | 非 ">非</option>
</select>
</div>
<div class="sel">
<input type="hidden" id="hfldFieldNameArticles3" name="hfldFieldNameArticles" />
<select name="dropAdvanceSearchFieldName" style="display: none">
</select>
</div>
<div class="input">
<input type="text" name="txtSearchArticles" id="txtSearchArticles3" maxlength="50"/>
</div>
</div>
<div class="sel_op">
<input type="button" class="add" /><input type="button" class="cut" />
</div>
<div class="filter">
<strong>时间：</strong>
<div class="t">
<input type="hidden" value="1989" id="hfldAdvanceStartYear" name="hfldAdvanceStartYear" />
<select name="dropAdvanceSearchYears" id="dropAdvanceSearchStartYears">
</select>
</div>
<span>-</span><div class="t">
<input type="hidden" value="2013" id="hfldAdvanceEndYear" name="hfldAdvanceEndYear" />
<select name="dropAdvanceSearchYears" id="dropAdvanceSearchEndYears">
</select>
</div>
</div>
<div class="filter">
</div>
<div class="submit">
<input type="button" onclick="g_AdvanceSearch(1);" value="确定" class="btn-green">
<input type="button" onclick="g_HideAdvanceSearch();" value="关闭" class="btn-gray">
</div>

</div>
</div>
</form>
</div>
<script type="text/javascript" src="/Template/t5/js/advancesearch.min.js"></script>

<script type="text/javascript">
$(function () {
var encodestr = $("#hifBaseLog").val().trim();
var BaseGch = "";
var BaseArticleId = "";
var BaseClass = "";
var BaseObjectType = 0;
var BaseObjectValue = "";

if (encodestr != "") {
var parames = encodestr.split(';');
BaseGch = parames[0];
BaseArticleId = parames[1];
BaseClass = parames[2];
BaseObjectType = parames[3];
BaseObjectValue = parames[4];
}

var obj = {};
obj.remark = "机构库站点访问记录-重庆科技学院";
obj.user_id = 0;
obj.user_ip_address = "216.73.216.107";
obj.user_group_id = 0;
obj.user_organ_id = 3233;
obj.site_id = 13;
if (BaseGch) {
obj.gch = BaseGch;
}
if (BaseArticleId) {
obj.article_id = BaseArticleId;
}
if (BaseClass) {
obj.full_class_ids = BaseClass;
}
if (BaseObjectType) {
obj.object_id = BaseObjectType;
}
if (BaseObjectValue) {
obj.object_value = BaseObjectValue;
}

loadScript("http://log.cqvip.com/VipCloud/Service/Log/js/analysis.js", function() { vipLog("view", obj,"LIBBEHAVIORANALYSIS"); });
});
</script>
</body>
</html>$

重庆科技学院机构知识库

专利详细信息

一种协同过滤推荐模型中调整学习速率的方法

我的收藏