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50  <h1>Source code for park.parkde</h1><div class="highlight"><pre>
51<span class="sd">&quot;&quot;&quot;</span>
52<span class="sd">&quot;&quot;&quot;</span>
53<span class="kn">from</span> <span class="nn">__future__</span> <span class="kn">import</span> <span class="n">division</span>
54<span class="kn">import</span> <span class="nn">thread</span>
55<span class="kn">import</span> <span class="nn">numpy</span>
56
57<span class="kn">import</span> <span class="nn">diffev</span>
58
59<span class="kn">import</span> <span class="nn">fit</span><span class="o">,</span><span class="nn">fitresult</span>
60
61<span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s">&#39;DiffEv&#39;</span><span class="p">]</span>
62
63<div class="viewcode-block" id="DiffEv"><a class="viewcode-back" href="../../dev/api/park.html#park.parkde.DiffEv">[docs]</a><span class="k">class</span> <span class="nc">DiffEv</span><span class="p">(</span><span class="n">fit</span><span class="o">.</span><span class="n">Fitter</span><span class="p">):</span>
64    <span class="sd">&quot;&quot;&quot;</span>
65<span class="sd">    Differential evolution optimizer</span>
66
67<span class="sd">    This implements `park.fit.Fitter`.</span>
68<span class="sd">    &quot;&quot;&quot;</span>
69
70    <span class="n">maxiter</span><span class="o">=</span><span class="mi">1000</span>
71    <span class="sd">&quot;&quot;&quot;Maximum number of iterations&quot;&quot;&quot;</span>
72    <span class="n">pop_scale</span><span class="o">=</span><span class="mi">4</span>
73    <span class="sd">&quot;&quot;&quot;Number of active points per dimension&quot;&quot;&quot;</span>
74    <span class="n">crossover_rate</span><span class="o">=</span><span class="mf">0.9</span>
75    <span class="sd">&quot;&quot;&quot;Amount of mixing in population&quot;&quot;&quot;</span>
76    <span class="n">Fscale</span><span class="o">=</span><span class="mf">0.5</span>
77    <span class="sd">&quot;&quot;&quot;Step size along difference vector&quot;&quot;&quot;</span>
78    <span class="n">tolerance</span><span class="o">=</span><span class="mf">1e-5</span>
79    <span class="sd">&quot;&quot;&quot;Fit tolerance&quot;&quot;&quot;</span>
80
81<div class="viewcode-block" id="DiffEv.progress"><a class="viewcode-back" href="../../dev/api/park.html#park.parkde.DiffEv.progress">[docs]</a>    <span class="k">def</span> <span class="nf">progress</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">k</span><span class="p">,</span> <span class="n">n</span><span class="p">):</span>
82        <span class="bp">self</span><span class="o">.</span><span class="n">handler</span><span class="o">.</span><span class="n">progress</span><span class="p">(</span><span class="n">k</span><span class="p">,</span><span class="n">n</span><span class="p">)</span></div>
83<div class="viewcode-block" id="DiffEv.improvement"><a class="viewcode-back" href="../../dev/api/park.html#park.parkde.DiffEv.improvement">[docs]</a>    <span class="k">def</span> <span class="nf">improvement</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="n">fx</span><span class="p">,</span> <span class="n">ncalls</span><span class="o">=-</span><span class="mi">1</span><span class="p">):</span>
84        <span class="bp">self</span><span class="o">.</span><span class="n">handler</span><span class="o">.</span><span class="n">result</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">x</span><span class="p">,</span><span class="n">fx</span><span class="p">,</span><span class="o">-</span><span class="mi">1</span><span class="p">)</span>
85        <span class="bp">self</span><span class="o">.</span><span class="n">handler</span><span class="o">.</span><span class="n">improvement</span><span class="p">()</span>
86</div>
87    <span class="k">def</span> <span class="nf">_call</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">objective</span><span class="p">,</span> <span class="n">x0</span><span class="p">,</span> <span class="n">bounds</span><span class="p">):</span>
88        <span class="n">x</span><span class="p">,</span><span class="n">fx</span><span class="p">,</span><span class="n">calls</span> <span class="o">=</span> <span class="n">diffev</span><span class="o">.</span><span class="n">diffev</span><span class="p">(</span><span class="n">objective</span><span class="p">,</span> <span class="n">bounds</span><span class="p">,</span>
89                                   <span class="n">maxiter</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">maxiter</span><span class="p">,</span>
90                                   <span class="n">pop_scale</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">pop_scale</span><span class="p">,</span>
91                                   <span class="n">crossover_rate</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">crossover_rate</span><span class="p">,</span>
92                                   <span class="n">Fscale</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">Fscale</span><span class="p">,</span>
93                                   <span class="n">tolerance</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">tolerance</span><span class="p">,</span>
94                                   <span class="n">x0</span><span class="o">=</span><span class="n">x0</span><span class="p">,</span> <span class="n">monitor</span><span class="o">=</span><span class="bp">self</span><span class="p">)</span>
95
96        <span class="c"># Post the result</span>
97        <span class="bp">self</span><span class="o">.</span><span class="n">handler</span><span class="o">.</span><span class="n">result</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">fx</span><span class="p">,</span> <span class="n">calls</span><span class="p">)</span>
98        <span class="bp">self</span><span class="o">.</span><span class="n">handler</span><span class="o">.</span><span class="n">result</span><span class="o">.</span><span class="n">calc_cov</span><span class="p">(</span><span class="n">objective</span><span class="p">)</span>
99        <span class="bp">self</span><span class="o">.</span><span class="n">handler</span><span class="o">.</span><span class="n">done</span> <span class="o">=</span> <span class="bp">True</span>
100        <span class="bp">self</span><span class="o">.</span><span class="n">handler</span><span class="o">.</span><span class="n">finalize</span><span class="p">()</span>
101
102    <span class="k">def</span> <span class="nf">_fit</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">objective</span><span class="p">,</span> <span class="n">x0</span><span class="p">,</span> <span class="n">bounds</span><span class="p">):</span>
103        <span class="bp">self</span><span class="o">.</span><span class="n">_threaded</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_call</span><span class="p">,</span> <span class="n">objective</span><span class="p">,</span> <span class="n">x0</span><span class="p">,</span> <span class="n">bounds</span><span class="p">)</span>
104</div>
105<span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">&quot;__main__&quot;</span><span class="p">:</span>
106    <span class="n">fit</span><span class="o">.</span><span class="n">demo2</span><span class="p">(</span><span class="n">fitter</span><span class="o">=</span><span class="n">DiffEv</span><span class="p">())</span>
107</pre></div>
108
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