From f35c5fca6a9faaa1caf3c1992844adf9033744e8 Mon Sep 17 00:00:00 2001
From: Justin Worthe <justin.worthe@gmail.com>
Date: Sat, 29 Aug 2015 20:22:40 +0200
Subject: Improved efficiency of network

---
 src/brain/neuron.cpp | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

(limited to 'src/brain/neuron.cpp')

diff --git a/src/brain/neuron.cpp b/src/brain/neuron.cpp
index f4fa12f..d1dd338 100644
--- a/src/brain/neuron.cpp
+++ b/src/brain/neuron.cpp
@@ -3,24 +3,26 @@
 
 double Neuron::sigmoid(double input) const
 {
-    double slope = 4.924273;
+    const double slope = 4.924273;
     return (1/(1+(std::exp(-(slope*input)))));
 }
 
-void Neuron::calculateActivation()
+bool Neuron::calculateActivation()
 {
     double newActivation = 0;
     for (auto const& link : _inputLinks)
     {
-	newActivation += link->weightedActivation();
+	newActivation += link.weightedActivation();
     }
     newActivation = sigmoid(newActivation);
 
-    _activationChanged = newActivation != _activation;
+    const double errorMargin = 0.000001;
+    bool activationChanged = std::abs(newActivation - _activation) > errorMargin;
     _activation = newActivation;
+    return activationChanged;
 }
 
-void Neuron::addInput(std::unique_ptr<NeuralLink>&& link)
+void Neuron::addInput(NeuralLink&& link)
 {
     _inputLinks.push_back(std::move(link));
 }
-- 
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