C++ DistMultiVec::Matrix方法代码示例

void RowMaxNorms( const DistMultiVec<F>& A, DistMultiVec<Base<F>>& norms )
{
    DEBUG_CSE
    norms.SetComm( A.Comm() );
    norms.Resize( A.Height(), 1 );
    RowMaxNorms( A.LockedMatrix(), norms.Matrix() );
}

void Apply
( const DistMultiVec<Real>& x, 
  const DistMultiVec<Real>& y,
        DistMultiVec<Real>& z,
  const DistMultiVec<Int>& orders, 
  const DistMultiVec<Int>& firstInds,
  Int cutoff )
{
    DEBUG_ONLY(CSE cse("soc::Apply"))
    soc::Dots( x, y, z, orders, firstInds );
    auto xRoots = x;
    auto yRoots = y;
    cone::Broadcast( xRoots, orders, firstInds );
    cone::Broadcast( yRoots, orders, firstInds );

    const Int firstLocalRow = x.FirstLocalRow();
    const Int localHeight = x.LocalHeight();
    const Real* xBuf     = x.LockedMatrix().LockedBuffer();
    const Real* xRootBuf = xRoots.LockedMatrix().LockedBuffer();
    const Real* yBuf     = y.LockedMatrix().LockedBuffer();
    const Real* yRootBuf = yRoots.LockedMatrix().LockedBuffer();
          Real* zBuf     = z.Matrix().Buffer();
    const Int* firstIndBuf = firstInds.LockedMatrix().LockedBuffer();

    for( Int iLoc=0; iLoc<localHeight; ++iLoc )
    {
        const Int i = iLoc + firstLocalRow;
        const Int firstInd = firstIndBuf[iLoc];
        if( i != firstInd )
            zBuf[iLoc] += xRootBuf[iLoc]*yBuf[iLoc] + yRootBuf[iLoc]*xBuf[iLoc];
    }
}

void EntrywiseMap
( const DistMultiVec<S>& A,
        DistMultiVec<T>& B,
        function<T(S)> func )
{
    DEBUG_CSE
    B.SetComm( A.Comm() );
    B.Resize( A.Height(), A.Width() );
    EntrywiseMap( A.LockedMatrix(), B.Matrix(), func );
}

void NesterovTodd
( const DistMultiVec<Real>& s, 
  const DistMultiVec<Real>& z,
        DistMultiVec<Real>& w )
{
    DEBUG_CSE
    w.SetComm( s.Comm() );
    w.Resize( s.Height(), 1 );
    const Real* sBuf = s.LockedMatrix().LockedBuffer();
    const Real* zBuf = z.LockedMatrix().LockedBuffer();
          Real* wBuf = w.Matrix().Buffer();

    const Int localHeight = w.LocalHeight();
    for( Int iLoc=0; iLoc<localHeight; ++iLoc )
        wBuf[iLoc] = Sqrt(sBuf[iLoc]/zBuf[iLoc]);
}

void QP
( const DistSparseMatrix<Real>& A, 
  const DistMultiVec<Real>& B, 
        DistMultiVec<Real>& X, 
  const qp::direct::Ctrl<Real>& ctrl )
{
    DEBUG_CSE

    const Int m = A.Height();
    const Int n = A.Width();
    const Int k = B.Width();
    mpi::Comm comm = A.Comm();
    DistSparseMatrix<Real> Q(comm), AHat(comm);
    DistMultiVec<Real> bHat(comm), c(comm);

    Herk( LOWER, ADJOINT, Real(1), A, Q );
    MakeHermitian( LOWER, Q );
    Zeros( AHat, 0, n );
    Zeros( bHat, 0, 1 );
    Zeros( X,    n, k );

    DistMultiVec<Real> q(comm), y(comm), z(comm);
    auto& qLoc = q.Matrix();
    auto& XLoc = X.Matrix();
    auto& BLoc = B.LockedMatrix();
    for( Int j=0; j<k; ++j )
    {
        auto xLoc = XLoc( ALL, IR(j) );
        auto bLoc = BLoc( ALL, IR(j) );

        Zeros( c, n, 1 );
        Zeros( q, m, 1 );
        qLoc = bLoc;
        Multiply( ADJOINT, Real(-1), A, q, Real(0), c );

        Zeros( q, n, 1 );
        qLoc = xLoc;
        El::QP( Q, AHat, bHat, c, q, y, z, ctrl );
        xLoc = qLoc;
    }
}

void RowTwoNorms( const DistSparseMatrix<F>& A, DistMultiVec<Base<F>>& norms )
{
    DEBUG_CSE
    typedef Base<F> Real;
    const Int localHeight = A.LocalHeight();
    const F* valBuf = A.LockedValueBuffer();
    const Int* offsetBuf = A.LockedOffsetBuffer();

    norms.SetComm( A.Comm() );
    norms.Resize( A.Height(), 1 );
    auto& normLoc = norms.Matrix();
    for( Int iLoc=0; iLoc<localHeight; ++iLoc )
    {
        Real scale = 0;
        Real scaledSquare = 1;
        const Int offset = offsetBuf[iLoc];
        const Int numConn = offsetBuf[iLoc+1] - offset;
        for( Int e=offset; e<offset+numConn; ++e )
            UpdateScaledSquare( valBuf[e], scale, scaledSquare );
        normLoc(iLoc) = scale*Sqrt(scaledSquare);
    }
}

void GetMappedDiagonal
( const DistSparseMatrix<T>& A,
        DistMultiVec<S>& d,
        function<S(const T&)> func,
        Int offset )
{
    EL_DEBUG_CSE
    const Int m = A.Height();
    const Int n = A.Width();
    const T* valBuf = A.LockedValueBuffer();
    const Int* colBuf = A.LockedTargetBuffer();

    if( m != n )
        LogicError("DistSparseMatrix GetMappedDiagonal assumes square matrix");
    if( offset != 0 )
        LogicError("DistSparseMatrix GetMappedDiagonal assumes offset=0");

    d.SetGrid( A.Grid() );
    d.Resize( El::DiagonalLength(m,n,offset), 1 );
    Fill( d, S(1) );

    S* dBuf = d.Matrix().Buffer();
    const Int dLocalHeight = d.LocalHeight();
    for( Int iLoc=0; iLoc<dLocalHeight; ++iLoc )
    {
        const Int i = d.GlobalRow(iLoc);
        const Int thisOff = A.RowOffset(iLoc);
        const Int nextOff = A.RowOffset(iLoc+1);
        auto it = std::lower_bound( colBuf+thisOff, colBuf+nextOff, i );
        if( *it == i )
        {
            const Int e = it-colBuf;
            dBuf[iLoc] = func(valBuf[e]);
        }
        else
            dBuf[iLoc] = func(0);
    }
}

void SafeScale
( Base<Field> numerator, Base<Field> denominator, DistMultiVec<Field>& A )
{
    EL_DEBUG_CSE
    SafeScale( numerator, denominator, A.Matrix() );
}