本文整理汇总了C++中DataReader::readline方法的典型用法代码示例。如果您正苦于以下问题：C++ DataReader::readline方法的具体用法？C++ DataReader::readline怎么用？C++ DataReader::readline使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类DataReader的用法示例。
在下文中一共展示了DataReader::readline方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: ss
RatingMatrix::RatingMatrix( DataReader& dreader, int userpos, int itempos, int ratingpos )
: m_numRatings( 0 ),
m_sumRatings( 0 ),
m_minRating( INT_MAX ),
m_maxRating( INT_MIN )
{
map< pair<size_t,size_t>, double > inputData;
while( !dreader.eof() )
{
vector<string> line = dreader.readline();
if( line.empty() )
{
break;
}
string userId = line[userpos];
string itemId = line[itempos];
std::stringstream ss( line[ratingpos] );
double rating;
ss >> rating;
//cout << "user [" << userId << "] item [" << itemId << "] rating: [" << rating << "]" << endl;
size_t row, col;
map<string,size_t>::iterator ind;
ind = m_userMapper.find( userId );
if( ind == m_userMapper.end() )
{
row = m_userMapper.size();
m_userMapper[userId] = row;
}
else
{
row = ind->second;
}
ind = m_itemMapper.find( itemId );
if( ind == m_itemMapper.end() )
{
col = m_itemMapper.size();
m_itemMapper[itemId] = col;
}
else
{
col = ind->second;
}
if( inputData.find( pair<size_t,size_t>( row, col ) ) != inputData.end() )
{
cout << "warning: <user:" << userId << " ,item:" << itemId << "> pair duplicated" << endl;
continue;
}
inputData[pair<size_t,size_t>( row, col )] = rating;
// Statistical data
++m_numRatings;
m_sumRatings += rating;
if( rating < m_minRating )
{
m_minRating = rating;
}
if( rating > m_maxRating )
{
m_maxRating = rating;
}
}
m_smatrix.resize( m_userMapper.size(), m_itemMapper.size() );
map< pair<size_t,size_t>, double >::iterator ind;
map< pair<size_t,size_t>, double >::iterator end = inputData.end();
for( ind = inputData.begin() ; ind != end ; ++ind )
{
size_t row = ind->first.first;
size_t col = ind->first.second;
double rating = ind->second;
//cout << "row: " << row << " col: " << col << " rating: " << rating << endl;
m_smatrix.set( row, col, rating );
}
//cout << "min rating: " << m_minRating << " max rating: " << m_maxRating << endl;
//cout << "dim: " << m_smatrix.rows() << "x" << m_smatrix.columns() << endl;
//m_smatrix.print();
}