bool MEModel::loadTrainingExamples( const char *trainFile )
{
FILE *fin = fopen(trainFile,"r");
if ( fin == NULL )
{
fprintf( stderr, "open train file %s failed!\n", trainFile );
return false;
}
int lineNum = 0;
int fieldNum = 0;
int ch;
bool endOfFile = false;
int curFieldCnt = 0;
while( !endOfFile )
{
ch = fgetc(fin);
curFieldCnt = 0;
while( true )
{
while( !isLineEnd(ch) && isSpace(ch) )
ch = fgetc(fin);
if( isLineEnd(ch) )
break;
while( !isLineEnd(ch) && !isSpace(ch) )
ch = fgetc(fin);
curFieldCnt ++;
}
if ( curFieldCnt > 0 )
{
lineNum ++;
fieldNum += curFieldCnt;
}
if( ch == EOF )
endOfFile = true;
}
rewind(fin);
M = lineNum;
VarStr word;
endOfFile = false;
xspace = new SpElem[fieldNum];
x = new SpElem*[M];
y = new int[M];
lineNum = 0;
int xIndex = 0;
while( !endOfFile )
{
ch = fgetc(fin);
curFieldCnt = 0;
int curY = 0, curX = 0;
char *ystr = NULL;
while( true )
{
while( !isLineEnd(ch) && isSpace(ch) )
ch = fgetc(fin);
if( isLineEnd(ch) )
break;
word.clear();
while( !isLineEnd(ch) && !isSpace(ch) )
{
word.add(ch);
ch = fgetc(fin);
}
curFieldCnt ++;
if( curFieldCnt == 1 )
{
ystr = new char[word.length()+1];
strcpy(ystr,word.c_str());
}
else
{
curX = feaIdMap.add(word.c_str());
xspace[xIndex].index = curX;
xspace[xIndex].value = 1;
if ( curFieldCnt == 2 )
x[lineNum] = &xspace[xIndex];
xIndex ++;
}
}
if ( curFieldCnt > 1 )
{
xspace[xIndex].index = -1; xspace[xIndex].value = 0;
xIndex ++;
curY = classNameIdMap.add(ystr);
y[lineNum] = curY;
lineNum ++;
}
if( ystr != NULL )
delete []ystr;
if ( ch == EOF )
endOfFile = true;
}
fclose(fin);
M = lineNum;
classNumber = (int)classNameIdMap.size();
needDestroyTrain = true;
return true;
}
// check whether string is a float
bool htmInterface::isFloat(const VarStr &str) {
if(str.empty()) return false;
uint32 len = str.length();
return (strspn(str.data(),"+-.e0123456789") == len) ? true : false ;
}
bool MaxEnt::parseLine( FILE *fin, FILE *fout, bool withClassLabel )
{
vector<string> feature;
int c;
int cnt = 0;
enum State{ SPACE, WORD, NONE };
int state = NONE;
VarStr word;
bool first = true;
while( (c=fgetc(fin)) != EOF )
{
if ( c == '\n' )
break;
cnt ++;
if ( state == NONE )
{
if ( isSpace(c) )
state = SPACE;
else
{
word.add(c);
state = WORD;
}
continue;
}
if ( isSpace(c) )
{
if ( state == WORD )
{
if ( !first )
feature.push_back(word.c_str());
else
{
if ( !withClassLabel )
feature.push_back(word.c_str());
first = false;
}
state = SPACE;
word.clear();
}
}
else
{
if ( state == SPACE )
{
word.add(c);
state = WORD;
}
else
word.add(c);
}
}
if ( c == EOF && cnt == 0 )
return false;
if ( word.length() > 0 )
{
if ( !first || (first&&!withClassLabel) )
feature.push_back(word.c_str());
}
if ( feature.size() > 0 )
{
vector<pair<string,double> > labelProbs;
int pcls = predict(feature,labelProbs);
fprintf(fout,"%s",labelProbs[pcls].first.c_str());
for( int i = 0; i < labelProbs.size(); i ++ )
fprintf(fout, "\t%s\t%lf", labelProbs[i].first.c_str(), labelProbs[i].second);
fprintf(fout,"\n");
}
return true;
}