hierarchical_layer_cn.html



<!DOCTYPE html>
<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->
<head>
  <meta charset="utf-8">
  
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  
  <title>支持双层序列作为输入的Layer &mdash; PaddlePaddle  文档</title>
  

    <link rel="stylesheet" href="../../_static/css/theme.css" type="text/css" />
  

        <link rel="index" title="索引"
              href="../../genindex.html"/>
        <link rel="search" title="搜索" href="../../search.html"/>
    <link rel="top" title="PaddlePaddle  文档" href="../../index.html"/>
        <link rel="up" title="RNN模型" href="index_cn.html"/>
        <link rel="next" title="单双层RNN API对比介绍" href="hrnn_rnn_api_compare_cn.html"/>
        <link rel="prev" title="Recurrent Group教程" href="recurrent_group_cn.html"/> 

  <link rel="stylesheet" href="https://cdn.jsdelivr.net/perfect-scrollbar/0.6.14/css/perfect-scrollbar.min.css" type="text/css" />
  <link rel="stylesheet" href="../../_static/css/override.css" type="text/css" />
  <script>
  var _hmt = _hmt || [];
  (function() {
    var hm = document.createElement("script");
    hm.src = "//hm.baidu.com/hm.js?b9a314ab40d04d805655aab1deee08ba";
    var s = document.getElementsByTagName("script")[0]; 
    s.parentNode.insertBefore(hm, s);
  })();
  </script>

  
  <script src="../../_static/js/modernizr.min.js"></script>

</head>

<body class="wy-body-for-nav" role="document">

  
  <header class="site-header">
    <div class="site-logo">
      <a href="/"><img src="../../_static/images/PP_w.png"></a>
    </div>
    <div class="site-nav-links">
      <div class="site-menu">
        <a class="fork-on-github" href="https://github.com/PaddlePaddle/Paddle" target="_blank"><i class="fa fa-github"></i>Fork me on Github</a>
        <div class="language-switcher dropdown">
          <a type="button" data-toggle="dropdown">
            <span>English</span>
            <i class="fa fa-angle-up"></i>
            <i class="fa fa-angle-down"></i>
          </a>
          <ul class="dropdown-menu">
            <li><a href="/doc_cn">中文</a></li>
            <li><a href="/doc">English</a></li>
          </ul>
        </div>
        <ul class="site-page-links">
          <li><a href="/">Home</a></li>
        </ul>
      </div>
      <div class="doc-module">
        
        <ul class="current">
<li class="toctree-l1"><a class="reference internal" href="../../getstarted/index_cn.html">新手入门</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../build_and_install/index_cn.html">安装与编译</a></li>
<li class="toctree-l1 current"><a class="reference internal" href="../index_cn.html">进阶使用</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../dev/index_cn.html">开发标准</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../faq/index_cn.html">FAQ</a></li>
</ul>

        
<div role="search">
  <form id="rtd-search-form" class="wy-form" action="../../search.html" method="get">
    <input type="text" name="q" placeholder="Search docs" />
    <input type="hidden" name="check_keywords" value="yes" />
    <input type="hidden" name="area" value="default" />
  </form>
</div>        
      </div>
    </div>
  </header>
  
  <div class="main-content-wrap">

    
    <nav class="doc-menu-vertical" role="navigation">
        
          
          <ul class="current">
<li class="toctree-l1"><a class="reference internal" href="../../getstarted/index_cn.html">新手入门</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../../getstarted/quickstart_cn.html">快速开始</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../getstarted/concepts/use_concepts_cn.html">基本使用概念</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../../build_and_install/index_cn.html">安装与编译</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../../build_and_install/pip_install_cn.html">使用pip安装</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../build_and_install/docker_install_cn.html">使用Docker安装运行</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../build_and_install/build_cn.html">用Docker编译和测试PaddlePaddle</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../build_and_install/build_from_source_cn.html">从源码编译</a></li>
</ul>
</li>
<li class="toctree-l1 current"><a class="reference internal" href="../index_cn.html">进阶使用</a><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="../cmd_parameter/index_cn.html">命令行参数设置</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../cmd_parameter/use_case_cn.html">使用案例</a></li>
<li class="toctree-l3"><a class="reference internal" href="../cmd_parameter/arguments_cn.html">参数概述</a></li>
<li class="toctree-l3"><a class="reference internal" href="../cmd_parameter/detail_introduction_cn.html">细节描述</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../cluster/index_cn.html">分布式训练</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../cluster/preparations_cn.html">环境准备</a></li>
<li class="toctree-l3"><a class="reference internal" href="../cluster/cmd_argument_cn.html">启动参数说明</a></li>
<li class="toctree-l3"><a class="reference internal" href="../cluster/multi_cluster/index_cn.html">在不同集群中运行</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../cluster/multi_cluster/fabric_cn.html">使用fabric启动集群训练</a></li>
<li class="toctree-l4"><a class="reference internal" href="../cluster/multi_cluster/openmpi_cn.html">在OpenMPI集群中提交训练作业</a></li>
<li class="toctree-l4"><a class="reference internal" href="../cluster/multi_cluster/k8s_cn.html">Kubernetes单机训练</a></li>
<li class="toctree-l4"><a class="reference internal" href="../cluster/multi_cluster/k8s_distributed_cn.html">Kubernetes分布式训练</a></li>
<li class="toctree-l4"><a class="reference internal" href="../cluster/multi_cluster/k8s_aws_cn.html">Distributed PaddlePaddle Training on AWS with Kubernetes</a></li>
</ul>
</li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../capi/index_cn.html">C-API预测库</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../capi/compile_paddle_lib_cn.html">安装与编译C-API预测库</a></li>
<li class="toctree-l3"><a class="reference internal" href="../capi/organization_of_the_inputs_cn.html">输入/输出数据组织</a></li>
<li class="toctree-l3"><a class="reference internal" href="../capi/workflow_of_capi_cn.html">C-API使用流程</a></li>
</ul>
</li>
<li class="toctree-l2 current"><a class="reference internal" href="index_cn.html">RNN模型</a><ul class="current">
<li class="toctree-l3"><a class="reference internal" href="rnn_config_cn.html">RNN配置</a></li>
<li class="toctree-l3"><a class="reference internal" href="recurrent_group_cn.html">Recurrent Group教程</a></li>
<li class="toctree-l3 current"><a class="current reference internal" href="#">支持双层序列作为输入的Layer</a></li>
<li class="toctree-l3"><a class="reference internal" href="hrnn_rnn_api_compare_cn.html">单双层RNN API对比介绍</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../optimization/gpu_profiling_cn.html">GPU性能调优</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../../dev/index_cn.html">开发标准</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../../dev/contribute_to_paddle_cn.html">如何贡献代码</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../dev/write_docs_cn.html">如何贡献文档</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../../faq/index_cn.html">FAQ</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../../faq/build_and_install/index_cn.html">编译安装与单元测试</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../faq/model/index_cn.html">模型配置</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../faq/parameter/index_cn.html">参数设置</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../faq/local/index_cn.html">本地训练与预测</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../faq/cluster/index_cn.html">集群训练与预测</a></li>
</ul>
</li>
</ul>

        
    </nav>
    
    <section class="doc-content-wrap">

      
<div role="navigation" aria-label="breadcrumbs navigation">
  <ul class="wy-breadcrumbs">
      
        <li><a href="../index_cn.html">进阶使用</a> > </li>
      
        <li><a href="index_cn.html">RNN模型</a> > </li>
      
    <li>支持双层序列作为输入的Layer</li>
  </ul>
</div>
      
      <div class="wy-nav-content" id="doc-content">
        <div class="rst-content">
          <div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
           <div itemprop="articleBody">
            
  <div class="section" id="layer">
<h1><a class="toc-backref" href="#id2">支持双层序列作为输入的Layer</a><a class="headerlink" href="#layer" title="永久链接至标题">¶</a></h1>
<div class="contents topic" id="contents">
<p class="topic-title first">Contents</p>
<ul class="simple">
<li><a class="reference internal" href="#layer" id="id2">支持双层序列作为输入的Layer</a><ul>
<li><a class="reference internal" href="#id1" id="id3">概述</a></li>
<li><a class="reference internal" href="#pooling" id="id4">pooling</a></li>
<li><a class="reference internal" href="#last-seq-first-seq" id="id5">last_seq 和 first_seq</a></li>
<li><a class="reference internal" href="#expand" id="id6">expand</a></li>
</ul>
</li>
</ul>
</div>
<div class="section" id="id1">
<h2><a class="toc-backref" href="#id3">概述</a><a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h2>
<p>在自然语言处理任务中，序列是一种常见的数据类型。一个独立的词语，可以看作是一个非序列输入，或者，我们称之为一个0层的序列；由词语构成的句子，是一个单层序列；若干个句子构成一个段落，是一个双层的序列。</p>
<p>双层序列是一个嵌套的序列，它的每一个元素，又是一个单层的序列。这是一种非常灵活的数据组织方式，帮助我们构造一些复杂的输入信息。</p>
<p>我们可以按照如下层次定义非序列，单层序列，以及双层序列。</p>
<ul class="simple">
<li>0层序列：一个独立的元素，类型可以是PaddlePaddle支持的任意输入数据类型</li>
<li>单层序列：排成一列的多个元素，每个元素是一个0层序列，元素之间的顺序是重要的输入信息</li>
<li>双层序列：排成一列的多个元素，每个元素是一个单层序列，称之为双层序列的一个子序列（subseq），subseq的每个元素是一个0层序列</li>
</ul>
<p>在 PaddlePaddle中，下面这些Layer能够接受双层序列作为输入，完成相应的计算。</p>
</div>
<div class="section" id="pooling">
<h2><a class="toc-backref" href="#id4">pooling</a><a class="headerlink" href="#pooling" title="永久链接至标题">¶</a></h2>
<p>pooling 的使用示例如下，详细见 <a class="reference internal" href="../../api/v2/config/layer.html#api-v2-layer-pooling"><span class="std std-ref">pooling</span></a> 配置API。</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span><span class="nv">seq_pool</span> <span class="o">=</span> pooling<span class="o">(</span><span class="nv">input</span><span class="o">=</span>layer,
                   <span class="nv">pooling_type</span><span class="o">=</span>pooling.Max<span class="o">()</span>,
                   <span class="nv">agg_level</span><span class="o">=</span>AggregateLevel.TO_SEQUENCE<span class="o">)</span>
</pre></div>
</div>
<ul class="simple">
<li><cite>pooling_type</cite> 目前支持两种，分别是：pooling.Max()和pooling.Avg()。</li>
<li><cite>agg_level=AggregateLevel.TO_NO_SEQUENCE</cite> 时（默认值）：<ul>
<li>作用：双层序列经过运算变成一个0层序列，或单层序列经过运算变成一个0层序列</li>
<li>输入：一个双层序列，或一个单层序列</li>
<li>输出：一个0层序列，即整个输入序列（单层或双层）的平均值（或最大值）</li>
</ul>
</li>
<li><cite>agg_level=AggregateLevel.TO_SEQUENCE</cite> 时：<ul>
<li>作用：一个双层序列经过运算变成一个单层序列</li>
<li>输入：必须是一个双层序列</li>
<li>输出：一个单层序列，序列的每个元素是原来双层序列每个subseq元素的平均值（或最大值）</li>
</ul>
</li>
</ul>
</div>
<div class="section" id="last-seq-first-seq">
<h2><a class="toc-backref" href="#id5">last_seq 和 first_seq</a><a class="headerlink" href="#last-seq-first-seq" title="永久链接至标题">¶</a></h2>
<p>last_seq 的使用示例如下（ <a class="reference internal" href="../../api/v2/config/layer.html#api-v2-layer-first-seq"><span class="std std-ref">first_seq</span></a> 类似），详细见 <a class="reference internal" href="../../api/v2/config/layer.html#api-v2-layer-last-seq"><span class="std std-ref">last_seq</span></a> 配置API。</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span><span class="nv">last</span> <span class="o">=</span> last_seq<span class="o">(</span><span class="nv">input</span><span class="o">=</span>layer,
                <span class="nv">agg_level</span><span class="o">=</span>AggregateLevel.TO_SEQUENCE<span class="o">)</span>
</pre></div>
</div>
<ul class="simple">
<li><cite>agg_level=AggregateLevel.TO_NO_SEQUENCE</cite> 时（默认值）：<ul>
<li>作用：一个双层序列经过运算变成一个0层序列，或一个单层序列经过运算变成一个0层序列</li>
<li>输入：一个双层序列或一个单层序列</li>
<li>输出：一个0层序列，即整个输入序列（双层或者单层）最后一个，或第一个元素。</li>
</ul>
</li>
<li><cite>agg_level=AggregateLevel.TO_SEQUENCE</cite> 时：
- 作用：一个双层序列经过运算变成一个单层序列
- 输入：必须是一个双层序列
- 输出：一个单层序列，其中每个元素是双层序列中每个subseq最后一个（或第一个）元素。</li>
</ul>
</div>
<div class="section" id="expand">
<h2><a class="toc-backref" href="#id6">expand</a><a class="headerlink" href="#expand" title="永久链接至标题">¶</a></h2>
<p>expand 的使用示例如下，详细见 <a class="reference internal" href="../../api/v2/config/layer.html#api-v2-layer-expand"><span class="std std-ref">ExpandLevel</span></a> 配置API。</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span><span class="nv">ex</span> <span class="o">=</span> expand<span class="o">(</span><span class="nv">input</span><span class="o">=</span>layer1,
            <span class="nv">expand_as</span><span class="o">=</span>layer2,
            <span class="nv">expand_level</span><span class="o">=</span>ExpandLevel.FROM_NO_SEQUENCE<span class="o">)</span>
</pre></div>
</div>
<ul class="simple">
<li><cite>expand_level=ExpandLevel.FROM_NO_SEQUENCE</cite> 时（默认值）：<ul>
<li>作用：一个0层序列经过运算扩展成一个单层序列，或者一个双层序列</li>
<li>输入：layer1必须是一个0层序列，是待扩展的数据；layer2 可以是一个单层序列，或者是一个双层序列，提供扩展的长度信息</li>
<li>输出：一个单层序列或一个双层序列，输出序列的类型（双层序列或单层序列）和序列中含有元素的数目同 layer2 一致。若输出是单层序列，单层序列的每个元素（0层序列），都是对layer1元素的拷贝；若输出是双层序列，双层序列每个subseq中每个元素（0层序列），都是对layer1元素的拷贝</li>
</ul>
</li>
<li><cite>expand_level=ExpandLevel.FROM_SEQUENCE</cite> 时：<ul>
<li>作用：一个单层序列经过运算扩展成一个双层序列</li>
<li>输入：layer1必须是一个单层序列，是待扩展的数据；layer2 必须是一个双层序列，提供扩展的长度信息</li>
<li>输出：一个双层序列，序列中含有元素的数目同 layer2 一致。要求单层序列含有元素的数目（0层序列）和双层序列含有subseq 的数目一致。单层序列第i个元素（0层序列），被扩展为一个单层序列，构成了输出双层序列的第i个 subseq 。</li>
</ul>
</li>
</ul>
</div>
</div>


           </div>
          </div>
          <footer>
  
    <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation">
      
        <a href="hrnn_rnn_api_compare_cn.html" class="btn btn-neutral float-right" title="单双层RNN API对比介绍" accesskey="n">Next <span class="fa fa-arrow-circle-right"></span></a>
      
      
        <a href="recurrent_group_cn.html" class="btn btn-neutral" title="Recurrent Group教程" accesskey="p"><span class="fa fa-arrow-circle-left"></span> Previous</a>
      
    </div>
  

  <hr/>

  <div role="contentinfo">
    <p>
        &copy; Copyright 2016, PaddlePaddle developers.

    </p>
  </div>
  Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>. 

</footer>

        </div>
      </div>

    </section>

  </div>
  

    <script type="text/javascript">
        var DOCUMENTATION_OPTIONS = {
            URL_ROOT:'../../',
            VERSION:'',
            COLLAPSE_INDEX:false,
            FILE_SUFFIX:'.html',
            HAS_SOURCE:  true,
            SOURCELINK_SUFFIX: ".txt",
        };
    </script>
      <script type="text/javascript" src="../../_static/jquery.js"></script>
      <script type="text/javascript" src="../../_static/underscore.js"></script>
      <script type="text/javascript" src="../../_static/doctools.js"></script>
      <script type="text/javascript" src="../../_static/translations.js"></script>
      <script type="text/javascript" src="https://cdn.bootcss.com/mathjax/2.7.0/MathJax.js"></script>
       
  
    <script type="text/javascript" src="../../_static/js/theme.js"></script>
  
  
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
  <script src="https://cdn.jsdelivr.net/perfect-scrollbar/0.6.14/js/perfect-scrollbar.jquery.min.js"></script>
  <script src="../../_static/js/paddle_doc_init.js"></script> 

</body>
</html>