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#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;
typedef vector<double> vec;
/*
* features
*
*/
double
isupper_f(string s)
{
if ( isupper(s[0]) ) return 0;
return 1;
}
double
len_f(string s)
{
return s.size();
}
/*
* vector ops
*
*/
double
dotprod( vec a, vec b )
{
assert( a.size() == b.size() );
double sum;
for ( size_t i = 0; i < a.size(); i++ ) {
sum += a[i] * b[i];
}
return sum;
}
vec
vadd( double x, vec v )
{
for ( size_t i = 0; i < v.size(); i++ ) {
v[i] += x;
}
return v;
}
vec
vadd( vec v, vec w )
{
assert( v.size() == w.size() );
for ( size_t i = 0; i < v.size(); i++ ) {
v[i] += w[i];
}
return v;
}
vec
vsub( vec v, vec w )
{
assert(v.size() == w.size());
for (size_t i = 0; i < v.size(); i++) {
v[i] -= w[i];
}
return v;
}
vec
vmult( double x, vec v )
{
for (size_t i = 0; i < v.size(); i++) {
v[i] *= x;
}
return v;
}
double
vlen( vec v )
{
return sqrt( dotprod(v, v) );
}
vec
vnorm( vec v )
{
double len = vlen(v);
for (size_t i = 0; i < v.size(); i++) {
v[i] /= len;
}
return v;
}
int
main( void )
{
vec 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);
}
vec weights;
weights += 0.,0.,0.;
double eta = 0.5;
for (size_t t = 0; t < 2; t++)
{
for (size_t x = 0; x < examples.size(); x++) {
vec feats;
feats += 1.;
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 <= 0 ) {
weights = vadd(weights, vmult(examples[x].first*eta, feats));
}
cout << "w " << weights[0] << " " << weights[1] << " " << weights[2] << endl;
}
cout << "--" << endl;
}
cout << endl;
for (size_t x = 0; x < examples.size(); x++) {
vec feats;
feats += 1.;
feats += isupper_f(examples[x].second), len_f(examples[x].second);
cout << dotprod(weights, feats) << endl;
}
vec f;
f += 1.;
f += isupper_f("Bauer"), len_f("Bauer");
cout << "test: " << dotprod(weights, f) << endl;
return 0;
}
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