<!doctype html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="X-UA-Compatible" content="IE=Edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><script type="text/javascript"> var _gaq = _gaq || []; _gaq.push(['_setAccount', 'UA-55120145-3']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); </script> <title>pyFTS.models.cheng — pyFTS 1.6 documentation</title> <link rel="stylesheet" href="../../../_static/bizstyle.css" type="text/css" /> <link rel="stylesheet" href="../../../_static/pygments.css" type="text/css" /> <script type="text/javascript" src="../../../_static/documentation_options.js"></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="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script> <script type="text/javascript" src="../../../_static/bizstyle.js"></script> <link rel="index" title="Index" href="../../../genindex.html" /> <link rel="search" title="Search" href="../../../search.html" /> <meta name="viewport" content="width=device-width,initial-scale=1.0"> <!--[if lt IE 9]> <script type="text/javascript" src="_static/css3-mediaqueries.js"></script> <![endif]--> </head><body> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../../../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../../../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="nav-item nav-item-0"><a href="../../../index.html">pyFTS 1.6 documentation</a> »</li> <li class="nav-item nav-item-1"><a href="../../index.html" accesskey="U">Module code</a> »</li> </ul> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <p class="logo"><a href="../../../index.html"> <img class="logo" src="../../../_static/logo_heading2.png" alt="Logo"/> </a></p> <div id="searchbox" style="display: none" role="search"> <h3>Quick search</h3> <div class="searchformwrapper"> <form class="search" action="../../../search.html" method="get"> <input type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <h1>Source code for pyFTS.models.cheng</h1><div class="highlight"><pre> <span></span><span class="sd">"""</span> <span class="sd">Trend Weighted Fuzzy Time Series by Cheng, Chen and Wu (2009)</span> <span class="sd">C.-H. Cheng, Y.-S. Chen, and Y.-L. Wu, “Forecasting innovation diffusion of products using trend-weighted fuzzy time-series model,” </span> <span class="sd">Expert Syst. Appl., vol. 36, no. 2, pp. 1826–1832, 2009.</span> <span class="sd">"""</span> <span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span> <span class="kn">from</span> <span class="nn">pyFTS.common</span> <span class="k">import</span> <span class="n">FuzzySet</span><span class="p">,</span> <span class="n">FLR</span><span class="p">,</span> <span class="n">fts</span> <span class="kn">from</span> <span class="nn">pyFTS.models</span> <span class="k">import</span> <span class="n">yu</span> <div class="viewcode-block" id="TrendWeightedFLRG"><a class="viewcode-back" href="../../../pyFTS.models.html#pyFTS.models.cheng.TrendWeightedFLRG">[docs]</a><span class="k">class</span> <span class="nc">TrendWeightedFLRG</span><span class="p">(</span><span class="n">yu</span><span class="o">.</span><span class="n">WeightedFLRG</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> First Order Trend Weighted Fuzzy Logical Relationship Group</span> <span class="sd"> """</span> <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">LHS</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> <span class="nb">super</span><span class="p">(</span><span class="n">TrendWeightedFLRG</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="n">LHS</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span> <span class="bp">self</span><span class="o">.</span><span class="n">w</span> <span class="o">=</span> <span class="kc">None</span> <div class="viewcode-block" id="TrendWeightedFLRG.weights"><a class="viewcode-back" href="../../../pyFTS.models.html#pyFTS.models.cheng.TrendWeightedFLRG.weights">[docs]</a> <span class="k">def</span> <span class="nf">weights</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">sets</span><span class="p">):</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">w</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span> <span class="n">count_nochange</span> <span class="o">=</span> <span class="mf">0.0</span> <span class="n">count_up</span> <span class="o">=</span> <span class="mf">0.0</span> <span class="n">count_down</span> <span class="o">=</span> <span class="mf">0.0</span> <span class="n">weights</span> <span class="o">=</span> <span class="p">[]</span> <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">RHS</span><span class="p">:</span> <span class="n">tmp</span> <span class="o">=</span> <span class="mi">0</span> <span class="k">if</span> <span class="n">sets</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">LHS</span><span class="p">]</span><span class="o">.</span><span class="n">centroid</span> <span class="o">==</span> <span class="n">sets</span><span class="p">[</span><span class="n">c</span><span class="p">]</span><span class="o">.</span><span class="n">centroid</span><span class="p">:</span> <span class="n">count_nochange</span> <span class="o">+=</span> <span class="mf">1.0</span> <span class="n">tmp</span> <span class="o">=</span> <span class="n">count_nochange</span> <span class="k">elif</span> <span class="n">sets</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">LHS</span><span class="p">]</span><span class="o">.</span><span class="n">centroid</span> <span class="o">></span> <span class="n">sets</span><span class="p">[</span><span class="n">c</span><span class="p">]</span><span class="o">.</span><span class="n">centroid</span><span class="p">:</span> <span class="n">count_down</span> <span class="o">+=</span> <span class="mf">1.0</span> <span class="n">tmp</span> <span class="o">=</span> <span class="n">count_down</span> <span class="k">else</span><span class="p">:</span> <span class="n">count_up</span> <span class="o">+=</span> <span class="mf">1.0</span> <span class="n">tmp</span> <span class="o">=</span> <span class="n">count_up</span> <span class="n">weights</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">tmp</span><span class="p">)</span> <span class="n">tot</span> <span class="o">=</span> <span class="nb">sum</span><span class="p">(</span><span class="n">weights</span><span class="p">)</span> <span class="bp">self</span><span class="o">.</span><span class="n">w</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([</span><span class="n">k</span> <span class="o">/</span> <span class="n">tot</span> <span class="k">for</span> <span class="n">k</span> <span class="ow">in</span> <span class="n">weights</span><span class="p">])</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">w</span></div></div> <div class="viewcode-block" id="TrendWeightedFTS"><a class="viewcode-back" href="../../../pyFTS.models.html#pyFTS.models.cheng.TrendWeightedFTS">[docs]</a><span class="k">class</span> <span class="nc">TrendWeightedFTS</span><span class="p">(</span><span class="n">yu</span><span class="o">.</span><span class="n">WeightedFTS</span><span class="p">):</span> <span class="sd">"""First Order Trend Weighted Fuzzy Time Series"""</span> <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> <span class="nb">super</span><span class="p">(</span><span class="n">TrendWeightedFTS</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="o">**</span><span class="n">kwargs</span><span class="p">)</span> <span class="bp">self</span><span class="o">.</span><span class="n">shortname</span> <span class="o">=</span> <span class="s2">"TWFTS"</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span> <span class="o">=</span> <span class="s2">"Trend Weighted FTS"</span> <span class="bp">self</span><span class="o">.</span><span class="n">detail</span> <span class="o">=</span> <span class="s2">"Cheng"</span> <span class="bp">self</span><span class="o">.</span><span class="n">is_high_order</span> <span class="o">=</span> <span class="kc">False</span> <div class="viewcode-block" id="TrendWeightedFTS.generate_FLRG"><a class="viewcode-back" href="../../../pyFTS.models.html#pyFTS.models.cheng.TrendWeightedFTS.generate_FLRG">[docs]</a> <span class="k">def</span> <span class="nf">generate_FLRG</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">flrs</span><span class="p">):</span> <span class="k">for</span> <span class="n">flr</span> <span class="ow">in</span> <span class="n">flrs</span><span class="p">:</span> <span class="k">if</span> <span class="n">flr</span><span class="o">.</span><span class="n">LHS</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">flrgs</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">flrgs</span><span class="p">[</span><span class="n">flr</span><span class="o">.</span><span class="n">LHS</span><span class="p">]</span><span class="o">.</span><span class="n">append_rhs</span><span class="p">(</span><span class="n">flr</span><span class="o">.</span><span class="n">RHS</span><span class="p">)</span> <span class="k">else</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">flrgs</span><span class="p">[</span><span class="n">flr</span><span class="o">.</span><span class="n">LHS</span><span class="p">]</span> <span class="o">=</span> <span class="n">TrendWeightedFLRG</span><span class="p">(</span><span class="n">flr</span><span class="o">.</span><span class="n">LHS</span><span class="p">)</span> <span class="bp">self</span><span class="o">.</span><span class="n">flrgs</span><span class="p">[</span><span class="n">flr</span><span class="o">.</span><span class="n">LHS</span><span class="p">]</span><span class="o">.</span><span class="n">append_rhs</span><span class="p">(</span><span class="n">flr</span><span class="o">.</span><span class="n">RHS</span><span class="p">)</span></div></div> </pre></div> </div> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../../../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../../../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="nav-item nav-item-0"><a href="../../../index.html">pyFTS 1.6 documentation</a> »</li> <li class="nav-item nav-item-1"><a href="../../index.html" >Module code</a> »</li> </ul> </div> <div class="footer" role="contentinfo"> © Copyright 2018, Machine Intelligence and Data Science Laboratory - UFMG - Brazil. Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.7.2. </div> </body> </html>