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Ingy döt Net 2023-07-01 11:58:00 -04:00
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<span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
<span style="color: #008080;">constant</span> <span style="color: #000000;">target</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"METHINKS IT IS LIKE A WEASEL"</span><span style="color: #0000FF;">,</span>
<span style="color: #000000;">AZS</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"ABCDEFGHIJKLMNOPQRSTUVWXYZ "</span><span style="color: #0000FF;">,</span>
<span style="color: #000000;">C</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">5000</span><span style="color: #0000FF;">,</span> <span style="color: #000080;font-style:italic;">-- children in each generation</span>
<span style="color: #000000;">P</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">15</span> <span style="color: #000080;font-style:italic;">-- probability of mutation (1 in 15)</span>
<span style="color: #008080;">function</span> <span style="color: #000000;">fitness</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">sample</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">string</span> <span style="color: #000000;">target</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">return</span> <span style="color: #7060A8;">sum</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">sq_eq</span><span style="color: #0000FF;">(</span><span style="color: #000000;">sample</span><span style="color: #0000FF;">,</span><span style="color: #000000;">target</span><span style="color: #0000FF;">))</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #008080;">function</span> <span style="color: #000000;">mutate</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">s</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">integer</span> <span style="color: #000000;">n</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
<span style="color: #008080;">if</span> <span style="color: #7060A8;">rand</span><span style="color: #0000FF;">(</span><span style="color: #000000;">n</span><span style="color: #0000FF;">)=</span><span style="color: #000000;">1</span> <span style="color: #008080;">then</span>
<span style="color: #000000;">s</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">AZS</span><span style="color: #0000FF;">[</span><span style="color: #7060A8;">rand</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">AZS</span><span style="color: #0000FF;">))]</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #008080;">return</span> <span style="color: #000000;">s</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #004080;">string</span> <span style="color: #000000;">parent</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">mutate</span><span style="color: #0000FF;">(</span><span style="color: #000000;">target</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span> <span style="color: #000080;font-style:italic;">-- (mutate with 100% probability)</span>
<span style="color: #004080;">sequence</span> <span style="color: #000000;">samples</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">C</span><span style="color: #0000FF;">)</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">gen</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">best</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">fit</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">best_fit</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">fitness</span><span style="color: #0000FF;">(</span><span style="color: #000000;">parent</span><span style="color: #0000FF;">,</span><span style="color: #000000;">target</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">while</span> <span style="color: #000000;">parent</span><span style="color: #0000FF;">!=</span><span style="color: #000000;">target</span> <span style="color: #008080;">do</span>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Generation%3d: %s, fitness %3.2f%%\n"</span><span style="color: #0000FF;">,</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">gen</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">parent</span><span style="color: #0000FF;">,</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">best_fit</span><span style="color: #0000FF;">/</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">target</span><span style="color: #0000FF;">))*</span><span style="color: #000000;">100</span><span style="color: #0000FF;">})</span>
<span style="color: #000000;">best_fit</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">-</span><span style="color: #000000;">1</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">C</span> <span style="color: #008080;">do</span>
<span style="color: #000000;">samples</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">mutate</span><span style="color: #0000FF;">(</span><span style="color: #000000;">parent</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">P</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">fit</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">fitness</span><span style="color: #0000FF;">(</span><span style="color: #000000;">samples</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">],</span> <span style="color: #000000;">target</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">fit</span> <span style="color: #0000FF;">></span> <span style="color: #000000;">best_fit</span> <span style="color: #008080;">then</span>
<span style="color: #000000;">best_fit</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">fit</span>
<span style="color: #000000;">best</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">i</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #000000;">parent</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">samples</span><span style="color: #0000FF;">[</span><span style="color: #000000;">best</span><span style="color: #0000FF;">]</span>
<span style="color: #000000;">gen</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">1</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">while</span>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Finally, \"%s\"\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">parent</span><span style="color: #0000FF;">})</span>
<!--