From 26c490f404731d053a6205719b6246502c07b449 Mon Sep 17 00:00:00 2001
From: Patrick Simianer <p@simianer.de>
Date: Sat, 14 Jun 2014 16:46:27 +0200
Subject: init

---
 perceptron/perceptron1.cc | 143 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 perceptron/perceptron1.cc

(limited to 'perceptron/perceptron1.cc')

diff --git a/perceptron/perceptron1.cc b/perceptron/perceptron1.cc
new file mode 100644
index 0000000..0d9957b
--- /dev/null
+++ b/perceptron/perceptron1.cc
@@ -0,0 +1,143 @@
+#include <iostream>
+#include <vector>
+#include <utility>
+#include <string>
+#include <boost/assign/std/vector.hpp>
+#include <cassert>
+#include <cmath>
+
+using namespace std;
+using namespace boost::assign;
+
+
+double
+isupper_f(string s)
+{
+  if ( isupper(s[0]) ) return 0;
+  return 1;
+}
+
+double
+len_f(string s)
+{
+  return s.size();
+}
+
+double
+dotprod(vector<double> a, vector<double> b)
+{
+  assert(a.size() == b.size());
+  double sum;
+  for (size_t i = 0; i < a.size(); i++) {
+    sum += a[i] * b[i];
+  }
+  return sum;
+}
+
+vector<double>
+vadd(double x, vector<double> v)
+{
+  for (size_t i = 0; i < v.size(); i++) {
+    v[i] += x;
+  }
+  return v;
+}
+
+vector<double>
+vadd(vector<double> v, vector<double> w)
+{
+  assert(v.size() == w.size());
+  for (size_t i = 0; i < v.size(); i++) {
+    v[i] += w[i];
+  }
+  return v;
+}
+
+vector<double>
+vsub(vector<double> v, vector<double> w)
+{
+  assert(v.size() == w.size());
+  for (size_t i = 0; i < v.size(); i++) {
+    v[i] -= w[i];
+  }
+  return v;
+}
+
+vector<double>
+vmult(double x, vector<double> v)
+{
+  for (size_t i = 0; i < v.size(); i++) {
+    v[i] *= x;
+  }
+  return v;
+}
+
+double
+vlen(vector<double> v)
+{
+  return sqrt(dotprod(v, v));
+}
+
+vector<double>
+vnorm(vector<double> v)
+{
+  double len = vlen(v);
+  for (size_t i = 0; i < v.size(); i++) {
+    v[i] /= len;
+  }
+  return v;
+}
+
+
+int main(void)
+{
+  vector<double> classes;
+  vector<string> words;
+  classes += -1.,     1.,      -1.,      1.,       -1.,    1.,      -1.,     1.,         -1.,     1.;
+  words   += "Haus","house","Mauer","plant","Zeug","hello","Maus","worker","Quartz","point";
+
+  vector<pair<double, string> > examples;
+  for (size_t i = 0; i < classes.size(); i++) {
+    pair<double, string> p;
+    p.first = classes[i];
+    p.second = words[i];
+    examples.push_back(p);
+  }
+
+  vector<double> weights;
+  weights += 0.,0.;
+
+  double eta = 0.5;
+  double bias = 0.;
+  
+  for (size_t t = 0; t < 2; t++)
+  {
+    for (size_t x = 0; x < examples.size(); x++) {
+      vector<double> feats;
+      feats += isupper_f(examples[x].second), len_f(examples[x].second);
+      double err = dotprod(weights, feats);
+      //if ( (examples[x].first == 1 && err < 0) || (examples[x].first == -1 && err >= 0) ) {
+      if ( examples[x].first  * (err + bias) <= 0 ) {
+        weights = vadd(weights, vmult(examples[x].first*eta, feats));
+        bias += examples[x].first*eta; 
+      }
+      cout << "w " << weights[0] << " " << weights[1] << " bias " << bias << endl;
+    }
+    cout << "--" << endl;
+  }
+  
+   cout << endl;
+   for (size_t x = 0; x < examples.size(); x++) {
+      vector<double> feats;
+      feats += isupper_f(examples[x].second), len_f(examples[x].second);
+      cout << dotprod(weights, feats) + bias << endl;
+    }
+    
+    vector<double> f;
+    f += isupper_f("Bauer"), len_f("Bauer");
+    cout << "test: " << dotprod(weights, f) + bias << endl;
+
+
+  return 0;
+}
+
-- 
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