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<a class="article-title" href="/2022/03/14/share1/">寒门博士致谢及其女友回复</a>
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<a href="/2022/03/14/share1/" class="archive-article-date">
<time datetime="2022-03-14T07:16:38.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2022-03-14</time>
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<p>作者：匿名<br>链接：<a target="_blank" rel="noopener" href="https://www.zhihu.com/question/58018004/answer/44668963">https://www.zhihu.com/question/58018004/answer/44668963</a></p>
<h2 id="博士致谢："><a href="#博士致谢：" class="headerlink" title="博士致谢："></a>博士致谢：</h2><p>我从进入大学到博士毕业整整十年。<br>在这十年中，我过得浑浑噩噩。十年前，我身高4250px（注：px是pixel的缩写, 意思是像素。1000px约=43cm），十年后，我身高还是4250px；十年前，我体重60kg，十年后，我体重还是60kg；十年前，我一无所有，十年后，我还是一无所有。<br>十年前，我眼睛明亮、有神，十年后，摘掉眼镜，我已看不清自己有多少个手指了；十年前，我声音洪亮、清澈，十年后，已经是慢性咽喉炎，声音嘶哑；十年前，我踌躇满志、指点江山、激扬文字，十年后，我心如止水，只求温饱；当然，我也得到了一些东西。<br>十年前，我还是个农民的儿子，十年后，我成为了一个博士；十年前，我只懂得砍柴、种田、割草、放牛，十年后，我已经成为了一个懂机械、金融、管理的复合型人才；但如果您问我这十年最大的长进是什么，我将告诉您：十年前，我十七，十年后，我二十七。<br>这十年中，我最渴望、最追求的是什么？是知识？不是。是美女？不是。而是钱。</p>
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<a class="article-more-a" href="/2022/03/14/share1/">展开全文 >></a>
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<a class="article-title" href="/2022/03/05/ML_1/">注意力机制（Attention Mechanism）</a>
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<a href="/2022/03/05/ML_1/" class="archive-article-date">
<time datetime="2022-03-05T07:00:19.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2022-03-05</time>
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<h2 id="简单介绍"><a href="#简单介绍" class="headerlink" title="简单介绍"></a>简单介绍</h2><p>注意力机制：从大量信息中筛选出更重要的信息</p>
<p>注意力机制(Attention Mechanism)源于对人类视觉的研究。在认知科学中，由于信息处理的瓶颈，人类会选择性地关注所有信息的一部分，同时忽略其他可见的信息。实现这一能力的原因是人类视网膜的不同部位具有不一样的信息处理能力，即不同部分的敏锐度(Acuity)不同，人类视网膜中央凹部位具有最高的敏锐度。为了合理利用有限的视觉信息处理资源，人类需要选择视觉区域中的特定部分，然后重点关注它。例如人们在用电脑屏幕看电影的时候，会重点关注和处理电脑屏幕范围内的视觉，而电脑屏幕外的视觉如键盘、电脑背景等等都会被忽视。</p>
<p>注意力机制最早用于自然语言处理领域(LP),后来在计算机视觉领域(CV)也得到广泛的应用，注意力机制被引入来进行视觉信息处理。注意力机制没有严格的数学定义，例如传统的局部图像特征提取、滑动窗口方法等都可以看作一种注意力机制。在神经网络中，注意力机制通常是一个额外的神经网络，能够硬性选择输入的某些部分，或者给输入的不同部分分配不同的权重。注意力机制能够从大量信息中筛选出重要的信息。</p>
<p>在神经网络中引入注意力机制有很多方法，以卷积神经网络为例，可以在空间维度增加引入attention机制（如inception网络的多尺度，让并联的卷积层有不同的权重），也可以在通道维度(channel)增加attention:机制，当然也有混合维度即同时在空间维度和通道维度增加attention机制。</p>
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<a href="/categories/深度学习//" class="article-tag-list-link color5">深度学习</a>
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<a href="/categories/深度学习/CV//" class="article-tag-list-link color3">CV</a>
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<a class="article-more-a" href="/2022/03/05/ML_1/">展开全文 >></a>
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<a class="article-title" href="/2022/01/20/n1/">n1</a>
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<time datetime="2022-01-20T07:29:39.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2022-01-20</time>
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<li>计算网络参数规模</li>
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<a class="article-title" href="/2022/01/18/3/">2.2：自适应波束形成</a>
</h1>
<a href="/2022/01/18/3/" class="archive-article-date">
<time datetime="2022-01-17T16:44:18.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2022-01-18</time>
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<h2 id="问题引出"><a href="#问题引出" class="headerlink" title="问题引出"></a>问题引出</h2><p>从前面的讨论可以看出，一旦阵列的几何形状固定，并且目标对准方向确定，DS 波束形成的波束模式特性，包括波束宽度、旁辦幅度、零点位置都将固定。这意味着如果想要调整波束模式，必须对阵列几何形状进行物理调整，显然，对于已经固化的阵列系统这是不可能的。此时会产生一个自然的想法：能否在不改变阵列几何形状的条件下通过信号处理技术调整其波束模式从而改进其性能？这些技术被称为固定波束形成的技术，这些技术考虑了阵列几何形状，但假设无法得到任何与声源和噪声信号有关的信息。</p>
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<p>有待解决的一些问题<br>
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<a class="article-title" href="/2022/01/17/2/">2.1：固定波束形成</a>
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<time datetime="2022-01-17T07:33:01.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2022-01-17</time>
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<h2 id="宽带波束形成的特殊性"><a href="#宽带波束形成的特殊性" class="headerlink" title="宽带波束形成的特殊性"></a>宽带波束形成的特殊性</h2><p>基于空间滤波的波束形成是针对单一频率就足以描述的窄带信号设计的。对于具有丰富频率成分的宽带语音而言，这些波束形成对不同频率具有不同的波束模式，并且波束带宽会随着频率的增加而减小。如果采用这样的波束形成，当波束指向与源入射角度不一致时，源信号会被低通滤波。此外，来自手与波束形成指向不同方向的噪声将在其整个频谱范围内非均匀地衰减，导致阵列输出中出现某些令人烦扰的现象。因此，必须研究具有不变响应的宽带波束形成技术。设计这样的宽带波束形成的常见方法是进行子带分解，并在不同频率上独立地设计窄带波束形成。这等价于对阵列输出进行空-时滤波，也就是众所周知的滤波-求和结构。宽带波束形成的核心问题则变为确定 空-时滤波器的系数。</p>
<h2 id="基本概念"><a href="#基本概念" class="headerlink" title="基本概念"></a>基本概念</h2><p>传统的波束形成可以描述为一个作用于传感器阵列输出的空间滤波器，以构造特定的波束方向图(方向特性)。这样一个空间滤波过程可以进一步分解为两个子过程：时间对齐和加权求和。</p>
<ul>
<li>时间对齐将每个传感器的输出延迟（或提前〉适当的时间，使各个传感器接收的来自目标方向的信号成分能够在时间上同步。该步骤需要事先知道 到达时间差 (TDOA)。TDOA 能够从阵列观测信号中通过时延估计得到。</li>
<li>加权求和就是要对 时间对齐的信号 进行加权，然后将加权结果加在一起形成一个输出。</li>
</ul>
<p>尽管这两个步骤在控制阵列波束模式中都具有重要作用(时间对齐控制着波束方向，加权求和控制着主瓣的波束宽度和旁瓣的特性），波束形成的重点通常集中于加权系数的确定。根据加权系数的确定方法可分为 固定波束形成技术 和 自适应波束形成技术</p>
<ul>
<li>固定波束形成技术：指如果这组滤波器一旦设计好，各滤波器加权系数固定不变（不随输入信号变化而变化）</li>
<li>自适应波束形成技术：是指根据信号和噪声的特性以自适应的方式估计加权系数（即滤波器参数会随着输入信号的变化而自动调整）</li>
</ul>
<p>在固定波東中，波束滤波器是事先设计好的，因此其设计思路与具体的声场环境和具体的信号无关，它只关心波束滤波器在不同空间方向的响应，只考虑理想的声场以及波東滤波器在这些理想声场中的响应。我们将首先介绍导向矢量和波束图的概念，然后定义理想声场以及固定波束的常用设计指标，接着介绍几种常用的固定波束设计方法，如延迟相加波束、差分波朿和超指向波束等。</p>
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<a class="article-title" href="/2022/01/17/1/">1：麦克风阵列简介</a>
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<p>实际上，麦克风阵列与天线阵列(如雷达和声纳）在实际应用中的工作方式是不同的，其原因如下：</p>
<ul>
<li>语音信号是宽带信号。</li>
<li>室内混响 （或者多径）效应显著。</li>
<li>环境特性和信号均高度韭平稳。</li>
<li>噪声与目标语音信号可能具有相同的频谱特性。</li>
<li>传感器的数目通常有限</li>
<li>人耳听力具有极宽的动态范围（听力正常情况下高达 120dB），并且对通道冲激响应的弱拖尾极其敏感。因此，滤波器模型的长度很长（抽头数目数以千计的情况并不少见）。</li>
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缺失模块。<br/>1、请确保node版本大于6.2<br/>2、在博客根目录（注意不是yilia根目录）执行以下命令：<br/> npm i hexo-generator-json-content --save<br/><br/>
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