GMatrix* loadData(const char* szFilename)
{
// Load the dataset by extension
PathData pd;
GFile::parsePath(szFilename, &pd);
GMatrix* pData = new GMatrix();
if(_stricmp(szFilename + pd.extStart, ".arff") == 0)
pData->loadArff(szFilename);
else if(_stricmp(szFilename + pd.extStart, ".csv") == 0)
pData->loadCsv(szFilename, ',', false, false);
else if(_stricmp(szFilename + pd.extStart, ".dat") == 0)
pData->loadCsv(szFilename, '\0', false, false);
else
throw Ex("Unsupported file format: ", szFilename + pd.extStart);
return pData;
}
///Return a pointer to newly allocated data read from the command line
///represented by args.
///
///The returned matrix is allocated by new and it is the caller's
///responsibility to deallocate it. The suggested manner is to use a
///Holder<GMatrix*>
///
///In the returned matrix, all of the attributes designated as labels
///have been moved to the end and ignored attributes have been
///removed. The original indices of all the attributes are returned in
///originalIndices.
///
///\param args the command-line arguments
///
///\param pLabelDims (out parameter) the index of the first attribute
///which is designated a label.
///
///\param originalIndices the vector in which to place the original
///indices. originalIndices[i] is the index in the original data file
///of the attribute currently at index i.
void loadDataWithSwitches(GMatrix& data, GArgReader& args, size_t& pLabelDims,
std::vector<size_t>& originalIndices)
{
// Load the dataset by extension
const char* szFilename = args.pop_string();
PathData pd;
GFile::parsePath(szFilename, &pd);
if(_stricmp(szFilename + pd.extStart, ".arff") == 0)
data.loadArff(szFilename);
else if(_stricmp(szFilename + pd.extStart, ".csv") == 0)
data.loadCsv(szFilename, ',', false, false);
else if(_stricmp(szFilename + pd.extStart, ".dat") == 0)
data.loadCsv(szFilename, '\0', false, false);
else
throw Ex("Unsupported file format: ", szFilename + pd.extStart);
//Make the initial list of original indices
originalIndices.resize(data.cols());
for(std::size_t i = 0; i < originalIndices.size(); ++i){
originalIndices.at(i) = i;
}
// Parse params
vector<size_t> ignore;
vector<size_t> labels;
while(args.next_is_flag())
{
if(args.if_pop("-labels"))
parseAttributeList(labels, args, data.cols());
else if(args.if_pop("-ignore"))
parseAttributeList(ignore, args, data.cols());
else
break;
}
// Throw out the ignored attributes
std::sort(ignore.begin(), ignore.end());
for(size_t i = ignore.size() - 1; i < ignore.size(); i--)
{
data.deleteColumn(ignore[i]);
originalIndices.erase(originalIndices.begin()+ignore[i]);
for(size_t j = 0; j < labels.size(); j++)
{
if(labels[j] >= ignore[i])
{
if(labels[j] == ignore[i])
throw Ex("Attribute ", to_str(labels[j]), " is both ignored and used as a label");
labels[j]--;
}
}
}
// Swap label columns to the end
pLabelDims = std::max((size_t)1, labels.size());
for(size_t i = 0; i < labels.size(); i++)
{
size_t src = labels[i];
size_t dst = data.cols() - pLabelDims + i;
if(src != dst)
{
data.swapColumns(src, dst);
std::swap(originalIndices.at(src),
originalIndices.at(dst));
for(size_t j = i + 1; j < labels.size(); j++)
{
if(labels[j] == dst)
{
labels[j] = src;
break;
}
}
}
}
}
