confusion.cc

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/*                Centre for Speech Technology Research                  */
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/*                     Author :  Paul Taylor                             */
/*                     Date   :  July 1995                               */
/*-----------------------------------------------------------------------*/
/*                   Confusion Matrix Calculation                        */
/*                                                                       */
/*=======================================================================*/
#include <cmath>
#include "EST_multistats.h"
#include "EST_math.h"
#include "EST_types.h"

using namespace std;

int nth(EST_String name, EST_TList<EST_String> &lex)
{
    EST_Litem *p;
    int i;

    for (i = 0, p = lex.head(); p!=0; p = p->next(), ++i)
    if (name == lex(p))
        return i;

    cerr << "Item " << name << " not found in word list\n";
    return -1;
}

EST_FMatrix confusion(EST_StrStr_KVL &list, EST_StrList &lex)
{
    EST_FMatrix a(lex.length(), lex.length());
    EST_Litem *p;
    int n, m;
    a.fill(0.0);

    for (p = list.list.head(); p!=0; p = p->next())
    {
    m = nth(list.key(p), lex);
    n = nth(list.val(p), lex);
    if ((n != -1) && (m != -1))
        a(m, n) = a(m, n)  + 1;
    }

    return a;
}
    
void print_confusion(const EST_FMatrix &a, EST_StrStr_KVL &list, 
             EST_StrList &lex)
{

    int i, j;
    EST_Litem *p;
    cout << "              ";
    (void)list;
    int n = a.num_rows();

    EST_FVector row_total(n);
    EST_FVector col_total(n);
    EST_FVector correct(n);

    for (i = 0; i < n; ++i)
    {
    row_total[i] = 0.0;
    for (j = 0; j < n; ++j)
        row_total[i] += a(i, j);
    }

    for (j = 0; j < n; ++j)
    {
    col_total[j] = 0.0;
    for (i = 0; i < n; ++i)
        col_total[j] += a(i, j);
    }

    for (i = 0; i < n; ++i)
    {
    float rt = row_total(i);
    if (rt == 0)
        correct[i] = 100;
    else
        correct[i] = 100.0 * a(i, i) / rt;
    }

    for (p = lex.head(); p != 0; p = p->next())
    {
//      cout.width(4);
//      cout.setf(ios::right);
        cout << lex(p).before(3) << "  ";
    }
    cout << endl;

    for (p = lex.head(), i = 0; i < n; ++i, p = p->next())
    {
    cout.width(12);
    cout << lex(p);
    for (j = 0; j < n; ++j)
    {
        cout.width(4);
        cout.precision(3);
        cout.setf(ios::right);
        cout.setf(ios::fixed, ios::floatfield);
        cout << ( (int) a(i, j) ) << " ";
    }
    cout.width(4);
    cout << (int)row_total(i) << "   ";
    cout.width(4);
    cout.setf(ios::right);
    cout << "[" << ((int)a(i, i)) << "/" << ((int)row_total(i)) << "]";
    cout.width(12);
    cout.precision(3);
    cout.setf(ios::right);
//  cout.setf(ios::fixed, ios::floatfield);
    if (isnanf(correct(i)))
        cout << endl;
    else
        cout << correct(i) << endl;
    }
    cout << "            ";
    for (j = 0; j < n; ++j)
    {
    cout.width(4);
    cout << ((int)col_total(j)) << " ";
    }
    cout << endl;

    // work out total correct
    EST_FMatrix b;
    float s, t, pp;
    t = sum(a);
    b = diagonalise(a);
    s = sum(b);
    if (s == 0)
    pp = 0;
    else if (t == 0)
    pp = 100.0;  // probably can't happen
    else
    pp = 100.0 * s/t;
    cout << "total " << ((int)t) << " correct " << s << " " 
    << pp << "%"<< endl;
}