188 lines
12 KiB
HTML
188 lines
12 KiB
HTML
|
||
|
||
<!DOCTYPE html>
|
||
<html class="writer-html5" lang="zh-CN">
|
||
<head>
|
||
<meta charset="utf-8" /><meta name="viewport" content="width=device-width, initial-scale=1" />
|
||
|
||
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
|
||
<title>FFT — MindSpore Signal+ 使用手册 alpha 文档</title>
|
||
<link rel="stylesheet" type="text/css" href="../../_static/pygments.css?v=03e43079" />
|
||
<link rel="stylesheet" type="text/css" href="../../_static/css/theme.css?v=e59714d7" />
|
||
<link rel="stylesheet" type="text/css" href="../../_static/table.css?v=72b86d3e" />
|
||
<link rel="stylesheet" type="text/css" href="../../_static/pageviews.css?v=ff0ce7dc" />
|
||
|
||
|
||
<script src="../../_static/jquery.js?v=5d32c60e"></script>
|
||
<script src="../../_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
|
||
<script data-url_root="../../" id="documentation_options" src="../../_static/documentation_options.js?v=595569a8"></script>
|
||
<script src="../../_static/doctools.js?v=888ff710"></script>
|
||
<script src="../../_static/sphinx_highlight.js?v=4825356b"></script>
|
||
<script src="../../_static/translations.js?v=beaddf03"></script>
|
||
<script async="async" src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
|
||
<script src="../../_static/table.js?v=99ed15ba"></script>
|
||
<script src="../../_static/js/theme.js"></script>
|
||
<link rel="index" title="索引" href="../../genindex.html" />
|
||
<link rel="search" title="搜索" href="../../search.html" />
|
||
<link rel="next" title="IFFT" href="ifft.html" />
|
||
<link rel="prev" title="ComplexAbs" href="complex_abs.html" />
|
||
</head>
|
||
|
||
<body class="wy-body-for-nav">
|
||
<div class="wy-grid-for-nav">
|
||
<nav data-toggle="wy-nav-shift" class="wy-nav-side">
|
||
<div class="wy-side-scroll">
|
||
<div class="wy-side-nav-search" >
|
||
|
||
|
||
|
||
<a href="../../index.html" class="icon icon-home">
|
||
MindSpore Signal+ 使用手册
|
||
</a>
|
||
<div role="search">
|
||
<form id="rtd-search-form" class="wy-form" action="../../search.html" method="get">
|
||
<input type="text" name="q" placeholder="搜索文档" aria-label="搜索文档" />
|
||
<input type="hidden" name="check_keywords" value="yes" />
|
||
<input type="hidden" name="area" value="default" />
|
||
</form>
|
||
</div>
|
||
</div><div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="导航菜单">
|
||
<ul class="current">
|
||
<li class="toctree-l1"><a class="reference internal" href="../../quickstart/index.html">快速入门</a></li>
|
||
<li class="toctree-l1"><a class="reference internal" href="../../appdevelop/index.html">应用开发示例</a></li>
|
||
<li class="toctree-l1 current"><a class="reference internal" href="../index.html">算子库支持</a><ul class="current">
|
||
<li class="toctree-l2"><a class="reference internal" href="../supported_op.html">算子库支持情况</a></li>
|
||
<li class="toctree-l2 current"><a class="reference internal" href="index.html">自定义算子列表</a><ul class="current">
|
||
<li class="toctree-l3"><a class="reference internal" href="complex_abs.html">ComplexAbs</a></li>
|
||
<li class="toctree-l3 current"><a class="current reference internal" href="#">FFT</a><ul>
|
||
<li class="toctree-l4"><a class="reference internal" href="#mindradar.FFT"><code class="docutils literal notranslate"><span class="pre">mindradar.FFT</span></code></a></li>
|
||
</ul>
|
||
</li>
|
||
<li class="toctree-l3"><a class="reference internal" href="ifft.html">IFFT</a></li>
|
||
</ul>
|
||
</li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../dsplib/dsplib_index.html">DSP Library C API Reference</a></li>
|
||
</ul>
|
||
</li>
|
||
<li class="toctree-l1"><a class="reference internal" href="../../refdoc/index.html">参考资料</a></li>
|
||
</ul>
|
||
|
||
</div>
|
||
</div>
|
||
</nav>
|
||
|
||
<section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"><nav class="wy-nav-top" aria-label="移动版导航菜单" >
|
||
<i data-toggle="wy-nav-top" class="fa fa-bars"></i>
|
||
<a href="../../index.html">MindSpore Signal+ 使用手册</a>
|
||
</nav>
|
||
|
||
<div class="wy-nav-content">
|
||
<div class="rst-content">
|
||
<div role="navigation" aria-label="页面导航">
|
||
<ul class="wy-breadcrumbs">
|
||
<li><a href="../../index.html" class="icon icon-home" aria-label="Home"></a></li>
|
||
<li class="breadcrumb-item"><a href="../index.html">算子库支持</a></li>
|
||
<li class="breadcrumb-item"><a href="index.html">自定义算子列表</a></li>
|
||
<li class="breadcrumb-item active">FFT</li>
|
||
<li class="wy-breadcrumbs-aside">
|
||
<a href="../../_sources/functionlib/custom_op/fft.rst.txt" rel="nofollow"> 查看页面源码</a>
|
||
</li>
|
||
</ul>
|
||
<hr/>
|
||
</div>
|
||
<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
|
||
|
||
<div itemprop="articleBody">
|
||
|
||
<section id="fft">
|
||
<h1>FFT<a class="headerlink" href="#fft" title="此标题的永久链接"></a></h1>
|
||
<dl class="py class">
|
||
<dt class="sig sig-object py" id="mindradar.FFT">
|
||
<em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">mindradar.</span></span><span class="sig-name descname"><span class="pre">FFT</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">n</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">-1</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">dim</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">-1</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">norm</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">'backward'</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#mindradar.FFT" title="永久链接至目标"></a></dt>
|
||
<dd><p>傅里叶变换FFT。计算表达式为:</p>
|
||
<div class="math notranslate nohighlight">
|
||
\[X[\omega_1, \dots, \omega_d] =
|
||
\sum_{n_1=0}^{N_1-1} \dots \sum_{n_d=0}^{N_d-1} x[n_1, \dots, n_d]
|
||
e^{-j\ 2 \pi \sum_{i=0}^d \frac{\omega_i n_i}{N_i}},\]</div>
|
||
<p>其中， <span class="math notranslate nohighlight">\(d\)</span> = <cite>signal_ndim</cite> 是信号的维度，<span class="math notranslate nohighlight">\(N_i\)</span> 则是信号第 <span class="math notranslate nohighlight">\(i\)</span> 个维度的大小。</p>
|
||
<dl class="simple">
|
||
<dt>参数：</dt><dd><ul class="simple">
|
||
<li><p><strong>n</strong> (int，可选) - 输出转换轴的长度。如果n小于输入的长度，则裁剪输入。如果它更大，则输入将填充零。如果未给出n，则使用沿轴指定的轴的输入长度。默认值： <code class="docutils literal notranslate"><span class="pre">-1</span></code> 。</p></li>
|
||
<li><p><strong>dim</strong> (int，可选) - 计算FFT的轴。如果没有给出，则使用最后一个轴。默认值： <code class="docutils literal notranslate"><span class="pre">-1</span></code> 。</p></li>
|
||
<li><p><strong>norm</strong> (str，可选) - 表示该操作的规范化方式，可选值：[ <code class="docutils literal notranslate"><span class="pre">"backward"</span></code> , <code class="docutils literal notranslate"><span class="pre">"forward"</span></code> , <code class="docutils literal notranslate"><span class="pre">"ortho"</span></code> ]。默认值： <code class="docutils literal notranslate"><span class="pre">"backward"</span></code> 。</p>
|
||
<ul>
|
||
<li><p>“backward”，正向变换不缩放，逆变换按 <span class="math notranslate nohighlight">\(1/n\)</span> 缩放，其中 <cite>n</cite> 表示输入 <cite>x</cite> 的元素数量。</p></li>
|
||
<li><p>“ortho”，正向变换与逆变换均按 <span class="math notranslate nohighlight">\(1/\sqrt n\)</span> 缩放。</p></li>
|
||
<li><p>“forward”，正向变换按 <span class="math notranslate nohighlight">\(1/n\)</span> 缩放，逆变换不缩放。</p></li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
</dd>
|
||
<dt>输入：</dt><dd><ul class="simple">
|
||
<li><p><strong>x</strong> (Tensor) - 输入Tensor的维数必须大于或等于 <cite>dim</cite> 。数据类型应为复数。</p></li>
|
||
</ul>
|
||
</dd>
|
||
<dt>输出：</dt><dd><p>Tensor，表示复数到复数傅里叶变换FFT的结果。</p>
|
||
</dd>
|
||
<dt>支持平台：</dt><dd><p><code class="docutils literal notranslate"><span class="pre">CPU</span></code></p>
|
||
</dd>
|
||
</dl>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">备注</p>
|
||
<p>FFT要求complex64或complex128类型的输入，返回complex64或complex128类型的输出。</p>
|
||
</div>
|
||
<p>示例：</p>
|
||
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="linenos">1</span><span class="kn">import</span><span class="w"> </span><span class="nn">mindspore</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="nn">ms</span>
|
||
<span class="linenos">2</span><span class="kn">import</span><span class="w"> </span><span class="nn">mindradar</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="nn">mr</span>
|
||
<span class="linenos">3</span><span class="kn">import</span><span class="w"> </span><span class="nn">numpy</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="nn">np</span>
|
||
<span class="linenos">4</span>
|
||
<span class="linenos">5</span><span class="n">x</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">exp</span><span class="p">(</span><span class="mi">3</span><span class="n">j</span> <span class="o">*</span> <span class="n">np</span><span class="o">.</span><span class="n">pi</span> <span class="o">*</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span> <span class="o">/</span> <span class="mi">10</span><span class="p">)</span><span class="o">.</span><span class="n">reshape</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">5</span><span class="p">)</span><span class="o">.</span><span class="n">astype</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">complex64</span><span class="p">)</span>
|
||
<span class="linenos">6</span><span class="n">x_tensor</span> <span class="o">=</span> <span class="n">ms</span><span class="o">.</span><span class="n">Tensor</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
|
||
<span class="hll"><span class="linenos">7</span><span class="n">fft</span> <span class="o">=</span> <span class="n">mr</span><span class="o">.</span><span class="n">FFT</span><span class="p">()</span>
|
||
</span><span class="linenos">8</span><span class="n">out</span> <span class="o">=</span> <span class="n">fft</span><span class="p">(</span><span class="n">x_tensor</span><span class="p">)</span>
|
||
<span class="linenos">9</span><span class="nb">print</span><span class="p">(</span><span class="n">out</span><span class="p">)</span>
|
||
</pre></div>
|
||
</div>
|
||
</dd></dl>
|
||
|
||
</section>
|
||
|
||
|
||
</div>
|
||
</div>
|
||
|
||
|
||
<div class="pageviews-container">
|
||
访问量：<span id="busuanzi_page_uv"></span> 次
|
||
</div>
|
||
<footer><div class="rst-footer-buttons" role="navigation" aria-label="页脚">
|
||
<a href="complex_abs.html" class="btn btn-neutral float-left" title="ComplexAbs" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> 上一页</a>
|
||
<a href="ifft.html" class="btn btn-neutral float-right" title="IFFT" accesskey="n" rel="next">下一页 <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a>
|
||
</div>
|
||
|
||
<hr/>
|
||
|
||
<div role="contentinfo">
|
||
<p>© 版权所有 2025 - 2026, NUDT-674。</p>
|
||
</div>
|
||
|
||
利用 <a href="https://www.sphinx-doc.org/">Sphinx</a> 构建，使用的
|
||
<a href="https://github.com/readthedocs/sphinx_rtd_theme">主题</a>
|
||
由 <a href="https://readthedocs.org">Read the Docs</a> 开发.
|
||
|
||
|
||
</footer>
|
||
</div>
|
||
</div>
|
||
</section>
|
||
</div>
|
||
<script>
|
||
jQuery(function () {
|
||
SphinxRtdTheme.Navigation.enable(true);
|
||
});
|
||
</script>
|
||
|
||
<script src="//cdn.busuanzi.cc/busuanzi/3.6.9/busuanzi.min.js" defer></script>
|
||
|
||
</body>
|
||
</html> |