From 6fd23da97fa9700f59c61a966b4bf7d25fa46b34 Mon Sep 17 00:00:00 2001
From: Paul Oliver <contact@pauloliver.dev>
Date: Thu, 29 Feb 2024 03:15:03 +0100
Subject: initial commit

---
 NNUtils.cpp | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 NNUtils.cpp

(limited to 'NNUtils.cpp')

diff --git a/NNUtils.cpp b/NNUtils.cpp
new file mode 100644
index 0000000..611768a
--- /dev/null
+++ b/NNUtils.cpp
@@ -0,0 +1,54 @@
+#include "NNUtils.hpp"
+
+std::default_random_engine rGenerator;
+
+void seedRand()
+{
+    rGenerator.seed(std::chrono::system_clock::now().time_since_epoch().count());
+}
+
+float realRand(float low, float hi)
+{
+    std::uniform_real_distribution<float> fDistributor(low, hi);
+    return fDistributor(rGenerator);
+}
+
+int intRand(int low, int hi)
+{
+    std::uniform_int_distribution<int> iDistributor(low, hi - 1);
+    return iDistributor(rGenerator);
+}
+
+float sigmoid(float input, float sensitivity)
+{
+    return 1.f / (1.f + expf(-input / sensitivity));
+}
+
+void crossover(const Chromosome &parent, const Chromosome &mother, Chromosome &child1, Chromosome &child2)
+{
+    if (parent.size() != mother.size())
+    {
+        return;
+    }
+
+    child1.clear();
+    child2.clear();
+
+    int cop = intRand(0, parent.size());
+
+    child1.insert(child1.end(), parent.begin(), parent.begin() + cop);
+    child1.insert(child1.end(), mother.begin() + cop, mother.end());
+    child2.insert(child2.end(), mother.begin(), mother.begin() + cop);
+    child2.insert(child2.end(), parent.begin() + cop, parent.end());
+}
+
+void mutate(Chromosome &chromosome, float mutationRate)
+{
+    for (auto &i : chromosome)
+    {
+        if (realRand(0.f, 1.f) < mutationRate)
+        {
+            i = realRand(-1.f, 1.f);
+        }
+    }
+}
-- 
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