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训练神经网络的五大算法

2016-10-27 Alberto Quesada 译:何永灿 CSDN

神经网络模型的每一类学习过程通常被归纳为一种训练算法。训练的算法有很多,它们的特点和性能各不相同。 问题的抽象 人们把神经网络的学习过程转化为求损失函数f的最小值问题。一般来说,损失函数包括误差项和正则项两部分。误差项衡量神经网络模型在训练数据集上的拟合程度,而正则项则是控制模型的复杂程度,防止出现过拟合现象。 损失函数的函数值由模型的参数(权重值和偏置值)所决定。我们可以把两部分参

神经网络模型的每一类学习过程通常被归纳为一种训练算法。训练的算法有很多,它们的特点和性能各不相同。 问题的抽象 人们把神经网络的学习过程转化为求损失函数f的最小值问题。一般来说,损失函数包括误差项和正则项两部分。误差项衡量神经网络模型在训练数据集上的拟合程度,而正则项则是控制模型的复杂程度,防止出现过拟合现象。 损失函数的函数值由模型的参数(权重值和偏置值)所决定。我们可以把两部分参数合并为一个n维的权重向量,记为w。下图是损失函数f(w)的图示。 如上图所示,w*是损失函数的最小值。在空间内任意选择一个点A,我们都能计算得到损失函数的一阶、二阶导数。一阶导数可以表示为一个向量: ᐁif(w) = df/dwi (i = 1,…,n) 同样的,损失函数的二阶导数可以表示为海森矩阵( Hessian Matrix ): Hi,jf(w) = d2f/dwi·dwj (i,j = 1,…,n) 多变量的连续可微分函数的求解问题一直被人们广泛地研究。许多的传统方法都能被直接用于神经网络模型的求解。 一维优化方法 尽管损失函数的值需要由多个参数决定,但是一维优化方法在这里也

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    2016-11-10 xyfg98

    谢谢分享!

    0

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    2016-10-30 871538379

    若能出个简化版的视频就好了

    0

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  4. [GetPortalCommentsPageByObjectIdResponse(id=154884, encodeId=540c154884f9, content=谢谢分享!, beContent=null, objectType=article, channel=null, level=null, likeNumber=106, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=fe261399236, createdName=xyfg98, createdTime=Thu Nov 10 21:52:31 CST 2016, time=2016-11-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=152148, encodeId=546f15214813, content=若能出个简化版的视频就好了, beContent=null, objectType=article, channel=null, level=null, likeNumber=128, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=a35e76003, createdName=871538379, createdTime=Sun Oct 30 10:09:59 CST 2016, time=2016-10-30, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1630342, encodeId=95171630342ba, content=<a href='/topic/show?id=44e0e449217' target=_blank style='color:#2F92EE;'>#神经网络#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=58, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=74492, encryptionId=44e0e449217, topicName=神经网络)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=e6ff21497204, createdName=by2016, createdTime=Sat Oct 29 12:32:00 CST 2016, time=2016-10-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=151866, encodeId=4fc5151866a1, content=??????, beContent=null, objectType=article, channel=null, level=null, likeNumber=113, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTI1XhklPKEGc4f1C2PjPzicuuuNo9rUNic4aJicDykZLFbXiaNgHkHraFHygjLKjb9SicQuscbHXnibpAvg/132, createdBy=c10b1972510, createdName=苗山青竹, createdTime=Sat Oct 29 09:48:39 CST 2016, time=2016-10-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=151851, encodeId=4c791518512c, content=酒红色滚滚滚, beContent=null, objectType=article, channel=null, level=null, likeNumber=113, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=80ba1962137, createdName=1e13aaccm00(暂无匿称), createdTime=Sat Oct 29 08:26:43 CST 2016, time=2016-10-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=151665, encodeId=5173151665b6, content=神经网络算法训练是否成熟,直接决定模型的效力, beContent=null, objectType=article, channel=null, level=null, likeNumber=94, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=c4a5105539, createdName=lovetcm, createdTime=Fri Oct 28 09:28:44 CST 2016, time=2016-10-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=151643, encodeId=b5a615164348, content=训练神经网络的五大算法。, beContent=null, objectType=article, channel=null, level=null, likeNumber=55, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cacheapi.medsci.cn/resource/upload/20160806/IMG57A5698BDB0244113.jpg, createdBy=32a91358059, createdName=jyzxjiangqin, createdTime=Fri Oct 28 07:28:19 CST 2016, time=2016-10-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=151642, encodeId=e0be151642e7, content=哈哈哈大结局, beContent=null, objectType=article, channel=null, level=null, likeNumber=77, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=80ba1962137, createdName=1e13aaccm00(暂无匿称), createdTime=Fri Oct 28 07:27:25 CST 2016, time=2016-10-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=151633, encodeId=280d15163347, content=想说明什么, beContent=null, objectType=article, channel=null, level=null, likeNumber=76, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/ajNVdqHZLLBkyaelI9ia3n9SbuKmBdaY0PqCOzd0nhRUstroXmUmXZ5EBTmibtLEvCCIpyHAqxQXGfZz49ibrwjkg/0, createdBy=39781652829, createdName=雾夜芭蕾, createdTime=Fri Oct 28 06:59:51 CST 2016, time=2016-10-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=151632, encodeId=3d4415163229, content=xcvvhhj, beContent=null, objectType=article, channel=null, level=null, likeNumber=58, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=b0171930782, createdName=为你把脉, createdTime=Fri Oct 28 06:58:46 CST 2016, time=2016-10-28, status=1, ipAttribution=)]
    2016-10-29 苗山青竹

    ??????

    0

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    2016-10-29 1e13aaccm00(暂无匿称)

    酒红色滚滚滚

    0

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    2016-10-28 lovetcm

    神经网络算法训练是否成熟,直接决定模型的效力

    0

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    2016-10-28 jyzxjiangqin

    训练神经网络的五大算法。

    0

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    2016-10-28 1e13aaccm00(暂无匿称)

    哈哈哈大结局

    0

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    2016-10-28 雾夜芭蕾

    想说明什么

    0

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    2016-10-28 为你把脉

    xcvvhhj

    0

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背景:神经网络在卒中后痴呆的的作用尚不清楚。研究人员提出假说:卒中所致皮层下胆碱能通路或大型神经网络受损引起卒中后痴呆。方法:在急性缺血性卒中患者中进行一项配对病例对照研究。卒中后3个月,应用韩国血管性认知障碍的统一标准评估患者是否发生痴呆,新近发生的痴呆患者为病例组。按照年龄,教育程度以及卒中的严重程度对痴呆患者进行配对,一个痴呆患者对应两个对照组患者。应用胆碱能通路高信号评分评估患者是否因急性

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