libtrilinos-kokkos-kernels-dev 12.12.1-5 / usr / include / trilinos / Kokkos_Blas1_MV.hpp

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#ifndef KOKKOS_BLAS1_MV_HPP_
#define KOKKOS_BLAS1_MV_HPP_

/// \file Kokkos_Blas1_MV.hpp
/// \brief BLAS 1 kernels specifically optimized for typical
///   Tpetra::Vector and Tpetra::MultiVector use cases.

#include <Kokkos_Blas1.hpp>
#include <Kokkos_Blas1_MV_impl_abs.hpp>
#include <Kokkos_Blas1_MV_impl_axpby.hpp>
#include <Kokkos_Blas1_MV_impl_dot.hpp>
#include <Kokkos_Blas1_MV_impl_fill.hpp>
#include <Kokkos_Blas1_MV_impl_mult.hpp>
#include <Kokkos_Blas1_MV_impl_nrm1.hpp>
#include <Kokkos_Blas1_MV_impl_nrm2.hpp>
#include <Kokkos_Blas1_MV_impl_nrm2w.hpp>
#include <Kokkos_Blas1_MV_impl_nrmInf.hpp>
#include <Kokkos_Blas1_MV_impl_recip.hpp>
#include <Kokkos_Blas1_MV_impl_scal.hpp>
#include <Kokkos_Blas1_MV_impl_sum.hpp>
#include <Kokkos_Blas1_MV_impl_update.hpp>

#include <type_traits> // requires C++11

// Define this if you want some of the methods below to print out
// information about the types that they use internally.  This is
// useful for figuring out whether they are using the right
// specialization of the kernel.
//
// #define KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO 1

#ifdef KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO
#  include <cxxabi.h>

namespace {
  // Print the type of t in demangled (human-readable) form.  This is
  // useful for debugging whether KokkosBlas::axpby() is calling one
  // of the full specializations, or the generic version of the
  // kernel.  See the following link for information about the
  // demangling function we call below:
  //
  // https://gcc.gnu.org/onlinedocs/libstdc++/manual/ext_demangling.html
  template<class T>
  std::string demangledTypeName (const T& t) {
    int status = 0;
    return abi::__cxa_demangle (typeid (t).name (), 0, 0, &status);
  }
}
#endif // KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO


namespace KokkosBlas {

namespace Impl {
// parallel_for functor for computing the square root, in place, of a
// one-dimensional View.  This is useful for following the MPI
// all-reduce that computes the square of the two-norms of the local
// columns of a Tpetra::MultiVector.
//
// mfh 14 Jul 2014: Carter says that, for now, the standard idiom for
// operating on a single scalar value on the device, is to run in a
// parallel_for with N = 1.
//
// FIXME (mfh 14 Jul 2014): If we could assume C++11, this functor
// would go away.
template<class ViewType>
class SquareRootFunctor {
public:
  typedef typename ViewType::execution_space execution_space;
  typedef typename ViewType::size_type size_type;

  SquareRootFunctor (const ViewType& theView) : theView_ (theView) {}

  KOKKOS_INLINE_FUNCTION void operator() (const size_type i) const {
    typedef typename ViewType::value_type value_type;
    theView_(i) = Kokkos::Details::ArithTraits<value_type>::sqrt (theView_(i));
  }

private:
  ViewType theView_;
};
}

/// \brief Compute the column-wise dot products of two multivectors.
///
/// \tparam RV 0-D resp. 1-D output View
/// \tparam XMV 1-D resp. 2-D input View
/// \tparam YMV 1-D resp. 2-D input View
///
/// \param R [out] Output 1-D or 0-D View to which to write results.
/// \param X [in] Input 2-D or 1-D View.
/// \param Y [in] Input 2-D or 1-D View.
///
/// This function implements a few different use cases:
/// <ul>
/// <li> If X and Y are both 1-D, then this is a single dot product.
///   R must be 0-D (a View of a single value). </li>
/// <li> If X and Y are both 2-D, then this function computes their
///   dot products columnwise.  R must be 1-D. </li>
/// <li> If X is 2-D and Y is 1-D, then this function computes the dot
///   product of each column of X, with Y, in turn.  R must be
///   1-D. </li>
/// <li> If X is 1-D and Y is 2-D, then this function computes the dot
///   product X with each column of Y, in turn.  R must be 1-D. </li>
/// </ul>
///
/// \note To implementers: We use enable_if here so that the compiler
///   doesn't confuse this version of dot() with the three-argument
///   version of dot() in Kokkos_Blas1.hpp.
template<class RV, class XMV, class YMV>
void
dot (const RV& R, const XMV& X, const YMV& Y,
     typename std::enable_if<Kokkos::Impl::is_view<RV>::value, int>::type = 0)
{
  static_assert (Kokkos::Impl::is_view<RV>::value, "KokkosBlas::dot: "
                 "R is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_view<XMV>::value, "KokkosBlas::dot: "
                 "X is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_view<YMV>::value, "KokkosBlas::dot: "
                 "Y is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_same<typename RV::value_type,
                   typename RV::non_const_value_type>::value,
                 "KokkosBlas::dot: R is const.  "
                 "It must be nonconst, because it is an output argument "
                 "(we have to be able to write to its entries).");
  static_assert (RV::rank == 0 || RV::rank == 1,
                 "KokkosBlas::dot: R must have rank 0 or 1.");
  static_assert (XMV::rank == 1 || XMV::rank == 2,
                 "KokkosBlas::dot: X must have rank 1 or 2.");
  static_assert (YMV::rank == 1 || YMV::rank == 2,
                 "KokkosBlas::dot: Y must have rank 1 or 2.");
  static_assert ((XMV::rank == 2 && YMV::rank == 2 && RV::rank == 1) ||
                 (XMV::rank == 1 && YMV::rank == 1 && RV::rank == 0) ||
                 (XMV::rank == 2 && YMV::rank == 1 && RV::rank == 1) ||
                 (XMV::rank == 1 && YMV::rank == 2 && RV::rank == 1),
                 "KokkosBlas::dot: Ranks of RV, XMV, and YMV don't match.  "
                 "See this function's documentation for the allowed "
                 "combinations of ranks.");

  // Check compatibility of dimensions at run time.

  // Regardless of ranks of X and Y, their numbers of rows must match.
  bool dimsMatch = true;
  if (X.dimension_0 () != Y.dimension_0 ()) {
    dimsMatch = false;
  }
  else if (X.dimension_1 () != Y.dimension_1 () &&
           X.dimension_1 () != 1 &&
           Y.dimension_1 () != 1) {
    // Numbers of columns don't match, and neither X nor Y have one column.
    dimsMatch = false;
  }
  const auto maxNumCols = X.dimension_1 () > Y.dimension_1 () ?
    X.dimension_1 () : Y.dimension_1 ();
  if (RV::rank == 1 && R.dimension_0 () != maxNumCols) {
    dimsMatch = false;
  }

  if (! dimsMatch) {
    std::ostringstream os;
    os << "KokkosBlas::dot: Dimensions of R, X, and Y do not match: ";
    if (RV::rank == 1) {
      os << "R: " << R.dimension_0 () << " x " << X.dimension_1 () << ", ";
    }
    os << "X: " << X.dimension_0 () << " x " << X.dimension_1 ()
       << ", Y: " << Y.dimension_0 () << " x " << Y.dimension_1 ();
    Kokkos::Impl::throw_runtime_exception (os.str ());
  }

  // Create unmanaged versions of the input Views.
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      RV::rank == 0,
      typename RV::non_const_value_type,
      typename RV::non_const_value_type* >::type,
    typename RV::array_layout,
    typename RV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > RV_Internal;
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      XMV::rank == 1,
      typename XMV::const_value_type*,
      typename XMV::const_value_type** >::type,
    typename XMV::array_layout,
    typename XMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > XMV_Internal;
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      YMV::rank == 1,
      typename YMV::const_value_type*,
      typename YMV::const_value_type** >::type,
    typename YMV::array_layout,
    typename YMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > YMV_Internal;

  RV_Internal R_internal = R;
  XMV_Internal X_internal = X;
  YMV_Internal Y_internal = Y;

#ifdef KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO
  using std::cerr;
  using std::endl;
  cerr << "KokkosBlas::dot:" << endl
       << "  RV_Internal: " << demangledTypeName (R_internal) << endl
       << "  XMV_Internal: " << demangledTypeName (X_internal) << endl
       << "  YMV_Internal: " << demangledTypeName (Y_internal) << endl
       << endl;
#endif // KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO

  Impl::Dot_MV<RV_Internal, XMV_Internal, YMV_Internal>::dot (R_internal, X_internal, Y_internal);
}

/// \brief Fill the multivector or single vector X with the given value.
///
/// \tparam XMV 1-D or 2-D output View
///
/// \param X [out] Output View (1-D or 2-D).
/// \param val [in] Value with which to fill the entries of X.
template<class XMV>
void
fill (const XMV& X, const typename XMV::non_const_value_type& val)
{
  static_assert (Kokkos::Impl::is_view<XMV>::value,
                 "KokkosBlas::fill: X is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_same<typename XMV::value_type,
                   typename XMV::non_const_value_type>::value,
                 "KokkosBlas::fill: X is const.  It must be nonconst, "
                 "because it is an output argument (we must be able to write "
                 "to its entries).");
  static_assert (XMV::rank == 1 || XMV::rank == 2, "KokkosBlas::fill: "
                 "X must have rank 1 or rank 2.");

  // Assign to the View type for which Impl::Fill is most likely to
  // have a full specialization.
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      XMV::rank == 1,
      typename XMV::non_const_value_type*,
      typename XMV::non_const_value_type** >::type,
    typename XMV::array_layout,
    typename XMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > XMV_Internal;

  XMV_Internal X_internal = X;
  Impl::Fill<XMV_Internal>::fill (X_internal, val);
}

/// \brief Compute the squares of the 2-norm(s) of the column(s) of
///   the multivector or single vector X.
///
/// \tparam RV 0-D or 1-D output View
/// \tparam XMV 1-D or 2-D input View
///
/// \param R [out] Output View to which to write results.
/// \param X [in] Input View.
template<class RV, class XMV>
void
nrm2_squared (const RV& R, const XMV& X)
{
  static_assert (Kokkos::Impl::is_view<RV>::value, "KokkosBlas::nrm2_squared: "
                 "R is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_view<XMV>::value, "KokkosBlas::nrm2_squared: "
                 "X is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_same<typename RV::value_type,
                   typename RV::non_const_value_type>::value,
                 "KokkosBlas::nrm2_squared: The output argument is const.  "
                 "It must be nonconst, because it is an output argument "
                 "(we have to be able to write to its entries).");
  static_assert ((RV::rank == 0 && XMV::rank == 1) ||
                 (RV::rank == 1 && XMV::rank == 2),
                 "KokkosBlas::nrm2_squared: Either RV has rank 0 and XMV has "
                 "rank 1, or RV has rank 1 and XMV has rank 2.");

  // Check compatibility of dimensions at run time.
  if (RV::rank == 1 && R.dimension_0 () != X.dimension_1 ()) {
    std::ostringstream os;
    os << "KokkosBlas::nrm2_squared: Dimensions do not match: "
       << "R: " << R.dimension_0 () << " x 1"
       << ", X: " << X.dimension_0 () << " x " << X.dimension_1 ();
    Kokkos::Impl::throw_runtime_exception (os.str ());
  }

  // Create unmanaged versions of the input Views.
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      RV::rank == 0,
      typename RV::non_const_value_type,
      typename RV::non_const_value_type* >::type,
    typename RV::array_layout,
    typename RV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > RV_Internal;
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      XMV::rank == 1,
      typename XMV::const_value_type*,
      typename XMV::const_value_type** >::type,
    typename XMV::array_layout,
    typename XMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > XMV_Internal;

  RV_Internal R_internal = R;
  XMV_Internal X_internal = X;

#ifdef KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO
  using std::cerr;
  using std::endl;
  cerr << "KokkosBlas::nrm2_squared:" << endl
       << "  RV_Internal: " << demangledTypeName (R_internal) << endl
       << "  XMV_Internal: " << demangledTypeName (X_internal) << endl
       << endl;
#endif // KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO

  Impl::Nrm2_MV<RV_Internal, XMV_Internal>::nrm2_squared (R_internal, X_internal);
}


/// \brief Compute the 1-norm(s) of the column(s) of the multivector
///   or single vector X.
///
/// \tparam RV 0-D or 1-D output View
/// \tparam XMV 1-D or 2-D input View
///
/// \param R [out] Output View to which to write results.
/// \param X [in] Input View.
template<class RV, class XMV>
void
nrm1 (const RV& R, const XMV& X)
{
  static_assert (Kokkos::Impl::is_view<RV>::value, "KokkosBlas::nrm1: "
                 "R is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_view<XMV>::value, "KokkosBlas::nrm1: "
                 "X is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_same<typename RV::value_type,
                   typename RV::non_const_value_type>::value,
                 "KokkosBlas::nrm1: The output argument is const.  "
                 "It must be nonconst, because it is an output argument "
                 "(we have to be able to write to its entries).");
  static_assert ((RV::rank == 0 && XMV::rank == 1) ||
                 (RV::rank == 1 && XMV::rank == 2),
                 "KokkosBlas::nrm1: Either RV has rank 0 and XMV has "
                 "rank 1, or RV has rank 1 and XMV has rank 2.");

  // Check compatibility of dimensions at run time.
  if (RV::rank == 1 && R.dimension_0 () != X.dimension_1 ()) {
    std::ostringstream os;
    os << "KokkosBlas::nrm1: Dimensions do not match: "
       << "R: " << R.dimension_0 () << " x 1"
       << ", X: " << X.dimension_0 () << " x " << X.dimension_1 ();
    Kokkos::Impl::throw_runtime_exception (os.str ());
  }

  // Create unmanaged versions of the input Views.
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      RV::rank == 0,
      typename RV::non_const_value_type,
      typename RV::non_const_value_type* >::type,
    typename RV::array_layout,
    typename RV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > RV_Internal;
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      XMV::rank == 1,
      typename XMV::const_value_type*,
      typename XMV::const_value_type** >::type,
    typename XMV::array_layout,
    typename XMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > XMV_Internal;

  RV_Internal R_internal = R;
  XMV_Internal X_internal = X;

#ifdef KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO
  using std::cerr;
  using std::endl;
  cerr << "KokkosBlas::nrm1:" << endl
       << "  RV_Internal: " << demangledTypeName (R_internal) << endl
       << "  XMV_Internal: " << demangledTypeName (X_internal) << endl
       << endl;
#endif // KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO

  Impl::Nrm1_MV<RV_Internal, XMV_Internal>::nrm1 (R_internal, X_internal);
}

/// \brief Compute the inf-norm(s) of the column(s) of the multivector
///   or single vector X.
///
/// \tparam RV 0-D or 1-D output View
/// \tparam XMV 1-D or 2-D input View
///
/// \param R [out] Output View to which to write results.
/// \param X [in] Input View.
template<class RV, class XMV>
void
nrmInf (const RV& R, const XMV& X)
{
  static_assert (Kokkos::Impl::is_view<RV>::value, "KokkosBlas::nrmInf: "
                 "R is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_view<XMV>::value, "KokkosBlas::nrmInf: "
                 "X is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_same<typename RV::value_type,
                   typename RV::non_const_value_type>::value,
                 "KokkosBlas::nrmInf: The output argument is const.  "
                 "It must be nonconst, because it is an output argument "
                 "(we have to be able to write to its entries).");
  static_assert ((RV::rank == 0 && XMV::rank == 1) ||
                 (RV::rank == 1 && XMV::rank == 2),
                 "KokkosBlas::nrmInf: Either RV has rank 0 and XMV has "
                 "rank 1, or RV has rank 1 and XMV has rank 2.");

  // Check compatibility of dimensions at run time.
  if (RV::rank == 1 && R.dimension_0 () != X.dimension_1 ()) {
    std::ostringstream os;
    os << "KokkosBlas::nrmInf: Dimensions do not match: "
       << "R: " << R.dimension_0 () << " x 1"
       << ", X: " << X.dimension_0 () << " x " << X.dimension_1 ();
    Kokkos::Impl::throw_runtime_exception (os.str ());
  }

  // Create unmanaged versions of the input Views.
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      RV::rank == 0,
      typename RV::non_const_value_type,
      typename RV::non_const_value_type* >::type,
    typename RV::array_layout,
    typename RV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > RV_Internal;
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      XMV::rank == 1,
      typename XMV::const_value_type*,
      typename XMV::const_value_type** >::type,
    typename XMV::array_layout,
    typename XMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > XMV_Internal;

  RV_Internal R_internal = R;
  XMV_Internal X_internal = X;

#ifdef KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO
  using std::cerr;
  using std::endl;
  cerr << "KokkosBlas::nrmInf:" << endl
       << "  RV_Internal: " << demangledTypeName (R_internal) << endl
       << "  XMV_Internal: " << demangledTypeName (X_internal) << endl
       << endl;
#endif // KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO

  Impl::NrmInf_MV<RV_Internal, XMV_Internal>::nrmInf (R_internal, X_internal);
}

namespace { // (anonymous)

// axpby() accepts both scalar coefficients a and b, and vector
// coefficients (apply one for each column of the input multivectors).
// This traits class helps axpby() select the correct specialization
// of AV and BV (the type of a resp. b) for invoking the
// implementation.
template<class T, bool isView>
struct GetInternalTypeForAxpby {
  typedef T type;
};

template<class T>
struct GetInternalTypeForAxpby<T, true> {
  typedef Kokkos::View<typename T::const_value_type*,
                       typename T::array_layout,
                       typename T::device_type,
                       Kokkos::MemoryTraits<Kokkos::Unmanaged> > type;
};

  // typedef typename Kokkos::Impl::if_c<
  //   Kokkos::Impl::is_view<BV>::value, // if BV is a Kokkos::View,
  //   Kokkos::View<typename BV::const_value_type*,
  //     typename BV::array_layout,
  //     typename BV::device_type,
  //     Kokkos::MemoryTraits<Kokkos::Unmanaged> >, // use the unmanaged version of BV,
  //   BV >::type BV_Internal; // else just use BV.

} // namespace (anonymous)


template<class AV, class XMV, class BV, class YMV>
void
axpby (const AV& a, const XMV& X, const BV& b, const YMV& Y)
{
  static_assert (Kokkos::Impl::is_view<XMV>::value, "KokkosBlas::axpby: "
                 "X is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_view<YMV>::value, "KokkosBlas::axpby: "
                 "Y is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_same<typename YMV::value_type,
                 typename YMV::non_const_value_type>::value,
                 "KokkosBlas::axpby: Y is const.  It must be nonconst, "
                 "because it is an output argument "
                 "(we must be able to write to its entries).");
  static_assert (YMV::rank == XMV::rank, "KokkosBlas::axpby: "
                 "X and Y must have the same rank.");
  static_assert (YMV::rank == 1 || YMV::rank == 2, "KokkosBlas::axpby: "
                 "XMV and YMV must either have rank 1 or rank 2.");

  // Check compatibility of dimensions at run time.
  if (X.dimension_0 () != Y.dimension_0 () ||
      X.dimension_1 () != Y.dimension_1 ()) {
    std::ostringstream os;
    os << "KokkosBlas::axpby: Dimensions of X and Y do not match: "
       << "X: " << X.dimension_0 () << " x " << X.dimension_1 ()
       << ", Y: " << Y.dimension_0 () << " x " << Y.dimension_1 ();
    Kokkos::Impl::throw_runtime_exception (os.str ());
  }

  // Create unmanaged versions of the input Views.  XMV and YMV may be
  // rank 1 or rank 2.  AV and BV may be either rank-1 Views, or
  // scalar values.
  typedef typename GetInternalTypeForAxpby<
    AV, Kokkos::Impl::is_view<AV>::value>::type AV_Internal;
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      XMV::rank == 1,
      typename XMV::const_value_type*,
      typename XMV::const_value_type** >::type,
    typename XMV::array_layout,
    typename XMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > XMV_Internal;
  typedef typename GetInternalTypeForAxpby<
    BV, Kokkos::Impl::is_view<BV>::value>::type BV_Internal;
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      YMV::rank == 1,
      typename YMV::non_const_value_type*,
      typename YMV::non_const_value_type** >::type,
    typename YMV::array_layout,
    typename YMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > YMV_Internal;

  AV_Internal  a_internal = a;
  XMV_Internal X_internal = X;
  BV_Internal  b_internal = b;
  YMV_Internal Y_internal = Y;

#ifdef KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO
  using std::cerr;
  using std::endl;
  cerr << "KokkosBlas::axpby:" << endl
       << "  AV_Internal: " << demangledTypeName (a_internal) << endl
       << "  XMV_Internal: " << demangledTypeName (X_internal) << endl
       << "  BV_Internal: " << demangledTypeName (b_internal) << endl
       << "  YMV_Internal: " << demangledTypeName (Y_internal) << endl
       << endl;
#endif // KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO

  return Impl::Axpby<AV_Internal, XMV_Internal, BV_Internal,
    YMV_Internal>::axpby (a_internal, X_internal, b_internal, Y_internal);
}


template<class RMV, class AV, class XMV>
void
scal (const RMV& R, const AV& a, const XMV& X)
{
  static_assert (Kokkos::Impl::is_view<RMV>::value, "KokkosBlas::scal: "
                 "R is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_view<XMV>::value, "KokkosBlas::scal: "
                 "X is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_same<typename RMV::value_type,
                 typename RMV::non_const_value_type>::value,
                 "KokkosBlas::scal: R is const.  "
                 "It must be nonconst, because it is an output argument "
                 "(we have to be able to write to its entries).");
  static_assert ((int) RMV::rank == (int) XMV::rank, "KokkosBlas::scal: "
                 "R and X must have the same rank.");
  static_assert (RMV::rank == 1 || RMV::rank == 2, "KokkosBlas::scal: "
                 "RMV and XMV must either have rank 1 or rank 2.");

  // Check compatibility of dimensions at run time.
  if (X.dimension_0 () != R.dimension_0 () ||
      X.dimension_1 () != R.dimension_1 ()) {
    std::ostringstream os;
    os << "KokkosBlas::scal: Dimensions of R and X do not match: "
       << "R: " << R.dimension_0 () << " x " << R.dimension_1 ()
       << ", X: " << X.dimension_0 () << " x " << X.dimension_1 ();
    Kokkos::Impl::throw_runtime_exception (os.str ());
  }

  // Create unmanaged versions of the input Views.  RMV and XMV may be
  // rank 1 or rank 2.  AV may be either a rank-1 View, or a scalar
  // value.
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      RMV::rank == 1,
      typename RMV::non_const_value_type*,
      typename RMV::non_const_value_type** >::type,
    typename RMV::array_layout,
    typename RMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > RMV_Internal;
  typedef typename GetInternalTypeForAxpby<
    AV, Kokkos::Impl::is_view<AV>::value>::type AV_Internal;
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      XMV::rank == 1,
      typename XMV::non_const_value_type*,
      typename XMV::non_const_value_type** >::type,
    typename XMV::array_layout,
    typename XMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > XMV_Internal;

  RMV_Internal R_internal = R;
  AV_Internal  a_internal = a;
  XMV_Internal X_internal = X;

#ifdef KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO
  using std::cerr;
  using std::endl;
  cerr << "KokkosBlas::scal:" << endl
       << "  RMV_Internal: " << demangledTypeName (R_internal) << endl
       << "  AV_Internal: " << demangledTypeName (a_internal) << endl
       << "  XMV_Internal: " << demangledTypeName (X_internal) << endl
       << endl;
#endif // KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO

  Impl::Scal<RMV_Internal, AV_Internal, XMV_Internal>::scal (R_internal, a_internal, X_internal);
}


/// \brief R(i,j) = abs(X(i,j))
///
/// Replace each entry in R with the absolute value (magnitude) of the
/// corresponding entry in X.
///
/// \tparam RMV 1-D or 2-D Kokkos::View specialization.
/// \tparam XMV 1-D or 2-D Kokkos::View specialization.  It must have
///   the same rank as RMV, and its entries must be assignable to
///   those of RMV.
template<class RMV, class XMV>
void
abs (const RMV& R, const XMV& X)
{
  static_assert (Kokkos::Impl::is_view<RMV>::value, "KokkosBlas::abs: "
                 "R is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_view<XMV>::value, "KokkosBlas::abs: "
                 "X is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_same<typename RMV::value_type,
                 typename RMV::non_const_value_type>::value,
                 "KokkosBlas::abs: R is const.  "
                 "It must be nonconst, because it is an output argument "
                 "(we have to be able to write to its entries).");
  static_assert (RMV::rank == XMV::rank, "KokkosBlas::abs: "
                 "R and X must have the same rank.");
  static_assert (RMV::rank == 1 || RMV::rank == 2, "KokkosBlas::abs: "
                 "RMV and XMV must either have rank 1 or rank 2.");

  // Check compatibility of dimensions at run time.
  if (X.dimension_0 () != R.dimension_0 () ||
      X.dimension_1 () != R.dimension_1 ()) {
    std::ostringstream os;
    os << "KokkosBlas::abs (MV): Dimensions of R and X do not match: "
       << "R: " << R.dimension_0 () << " x " << R.dimension_1 ()
       << ", X: " << X.dimension_0 () << " x " << X.dimension_1 ();
    Kokkos::Impl::throw_runtime_exception (os.str ());
  }

  // Create unmanaged versions of the input Views.  RMV and XMV may be
  // rank 1 or rank 2.
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      RMV::rank == 1,
      typename RMV::non_const_value_type*,
      typename RMV::non_const_value_type** >::type,
    typename RMV::array_layout,
    typename RMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > RMV_Internal;
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      XMV::rank == 1,
      typename XMV::non_const_value_type*,
      typename XMV::non_const_value_type** >::type,
    typename XMV::array_layout,
    typename XMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > XMV_Internal;

  RMV_Internal R_internal = R;
  XMV_Internal X_internal = X;

#ifdef KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO
  using std::cerr;
  using std::endl;
  cerr << "KokkosBlas::abs:" << endl
       << "  RMV_Internal: " << demangledTypeName (R_internal) << endl
       << "  XMV_Internal: " << demangledTypeName (X_internal) << endl
       << endl;
#endif // KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO

  Impl::Abs<RMV_Internal, XMV_Internal>::abs (R_internal, X_internal);
}


/// \brief Compute Z := alpha*X + beta*Y + gamma*Z.
///
/// \tparam XMV 1-D or 2-D Kokkos::View specialization.
/// \tparam YMV 1-D or 2-D Kokkos::View specialization.  It must have
///   the same rank as XMV.
/// \tparam ZMV 1-D or 2-D Kokkos::View specialization.  It must have
///   the same rank as XMV and YMV, and it must make sense to add up
///   the entries of XMV and YMV and assign them to the entries of
///   ZMV.
template<class XMV, class YMV, class ZMV>
void
update (const typename XMV::non_const_value_type& alpha, const XMV& X,
        const typename YMV::non_const_value_type& beta, const YMV& Y,
        const typename ZMV::non_const_value_type& gamma, const ZMV& Z)
{
  static_assert (Kokkos::Impl::is_view<XMV>::value, "KokkosBlas::update: "
                 "X is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_view<YMV>::value, "KokkosBlas::update: "
                 "Y is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_view<ZMV>::value, "KokkosBlas::update: "
                 "Z is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_same<typename ZMV::value_type,
                 typename ZMV::non_const_value_type>::value,
                 "KokkosBlas::update: Z is const.  "
                 "It must be nonconst, because it is an output argument "
                 "(we have to be able to write to its entries).");
  static_assert (ZMV::rank == XMV::rank, "KokkosBlas::update: "
                 "X and Z must have the same rank.");
  static_assert (ZMV::rank == YMV::rank, "KokkosBlas::update: "
                 "Y and Z must have the same rank.");
  static_assert (ZMV::rank == 1 || ZMV::rank == 2, "KokkosBlas::update: "
                 "XMV, YMV, and ZMV must either have rank 1 or rank 2.");

  // Check compatibility of dimensions at run time.
  if (X.dimension_0 () != Y.dimension_0 () ||
      X.dimension_1 () != Y.dimension_1 () ||
      X.dimension_0 () != Z.dimension_0 () ||
      X.dimension_1 () != Z.dimension_1 ()) {
    std::ostringstream os;
    os << "KokkosBlas::update (MV): Dimensions of X, Y, and Z do not match: "
       << "Z: " << Z.dimension_0 () << " x " << Z.dimension_1 ()
       << ", X: " << X.dimension_0 () << " x " << X.dimension_1 ()
       << ", Y: " << Y.dimension_0 () << " x " << Y.dimension_1 ();
    Kokkos::Impl::throw_runtime_exception (os.str ());
  }

  // Create unmanaged versions of the input Views.  XMV, YMV, and ZMV
  // may be rank 1 or rank 2, but they must all have the same rank.

  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      XMV::rank == 1,
      typename XMV::const_value_type*,
      typename XMV::const_value_type** >::type,
    typename XMV::array_layout,
    typename XMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > XMV_Internal;

  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      YMV::rank == 1,
      typename YMV::const_value_type*,
      typename YMV::const_value_type** >::type,
    typename YMV::array_layout,
    typename YMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > YMV_Internal;

  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      ZMV::rank == 1,
      typename ZMV::non_const_value_type*,
      typename ZMV::non_const_value_type** >::type,
    typename ZMV::array_layout,
    typename ZMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > ZMV_Internal;

  XMV_Internal X_internal = X;
  YMV_Internal Y_internal = Y;
  ZMV_Internal Z_internal = Z;

#ifdef KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO
  using std::cerr;
  using std::endl;
  cerr << "KokkosBlas::update:" << endl
       << "  XMV_Internal: " << demangledTypeName (X_internal) << endl
       << "  YMV_Internal: " << demangledTypeName (Y_internal) << endl
       << "  ZMV_Internal: " << demangledTypeName (Z_internal) << endl
       << endl;
#endif // KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO

  return Impl::Update<XMV_Internal, YMV_Internal,
    ZMV_Internal>::update (alpha, X_internal, beta, Y_internal,
                           gamma, Z_internal);
}


/// \brief R(i,j) = 1 / X(i,j)
///
/// Replace each entry in R with the reciprocal of the corresponding
/// entry in X.
template<class RMV, class XMV>
void
reciprocal (const RMV& R, const XMV& X)
{
  static_assert (Kokkos::Impl::is_view<RMV>::value, "KokkosBlas::reciprocal: "
                 "R is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_view<XMV>::value, "KokkosBlas::reciprocal: "
                 "X is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_same<typename RMV::value_type,
                 typename RMV::non_const_value_type>::value,
                 "KokkosBlas::reciprocal: R is const.  "
                 "It must be nonconst, because it is an output argument "
                 "(we have to be able to write to its entries).");
  static_assert (RMV::rank == XMV::rank, "KokkosBlas::reciprocal: "
                 "R and X must have the same rank.");
  static_assert (RMV::rank == 1 || RMV::rank == 2, "KokkosBlas::reciprocal: "
                 "RMV and XMV must either have rank 1 or rank 2.");

  // Check compatibility of dimensions at run time.
  if (X.dimension_0 () != R.dimension_0 () ||
      X.dimension_1 () != R.dimension_1 ()) {
    std::ostringstream os;
    os << "KokkosBlas::reciprocal (MV): Dimensions of R and X do not match: "
       << "R: " << R.dimension_0 () << " x " << R.dimension_1 ()
       << ", X: " << X.dimension_0 () << " x " << X.dimension_1 ();
    Kokkos::Impl::throw_runtime_exception (os.str ());
  }

  // Create unmanaged versions of the input Views.  RMV and XMV may be
  // rank 1 or rank 2.
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      RMV::rank == 1,
      typename RMV::non_const_value_type*,
      typename RMV::non_const_value_type** >::type,
    typename RMV::array_layout,
    typename RMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > RMV_Internal;
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      XMV::rank == 1,
      typename XMV::non_const_value_type*,
      typename XMV::non_const_value_type** >::type,
    typename XMV::array_layout,
    typename XMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > XMV_Internal;

  RMV_Internal R_internal = R;
  XMV_Internal X_internal = X;

#ifdef KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO
  using std::cerr;
  using std::endl;
  cerr << "KokkosBlas::reciprocal:" << endl
       << "  RMV_Internal: " << demangledTypeName (R_internal) << endl
       << "  XMV_Internal: " << demangledTypeName (X_internal) << endl
       << endl;
#endif // KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO

  Impl::Reciprocal<RMV_Internal, XMV_Internal>::reciprocal (R_internal, X_internal);
}

//! Compute sum of each column of X, and write to corresponding entry of R.
template<class RV, class XMV>
void
sum (const RV& R, const XMV& X)
{
  static_assert (Kokkos::Impl::is_view<RV>::value, "KokkosBlas::sum: "
                 "R is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_view<XMV>::value, "KokkosBlas::sum: "
                 "X is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_same<typename RV::value_type,
                 typename RV::non_const_value_type>::value,
                 "KokkosBlas::sum: R is const.  "
                 "It must be nonconst, because it is an output argument "
                 "(we have to be able to write to its entries).");
  static_assert ((RV::rank == 0 && XMV::rank == 1) || (RV::rank == 1 && XMV::rank == 2),
                 "KokkosBlas::sum: Ranks of R and X do not match.");

  // Check compatibility of dimensions at run time.
  if (RV::rank == 1 && R.dimension_0 () != X.dimension_1 ()) {
    std::ostringstream os;
    os << "KokkosBlas::sum: Dimensions of R and X do not match: ";
    os << "R: " << R.dimension_0 () << " x 1, "
       << "X: " << X.dimension_0 () << " x " << X.dimension_1 ();
    Kokkos::Impl::throw_runtime_exception (os.str ());
  }

  // Create unmanaged versions of the input Views.  XMV may be rank 1
  // or rank 2, and RV may be rank 0 or rank 1.
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      RV::rank == 0,
      typename RV::non_const_value_type,
      typename RV::non_const_value_type* >::type,
    typename RV::array_layout,
    typename RV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > RV_Internal;

  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      XMV::rank == 1,
      typename XMV::const_value_type*,
      typename XMV::const_value_type** >::type,
    typename XMV::array_layout,
    typename XMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > XMV_Internal;

  RV_Internal R_internal = R;
  XMV_Internal X_internal = X;

#ifdef KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO
  using std::cerr;
  using std::endl;
  cerr << "KokkosBlas::sum:" << endl
       << "  RV_Internal: " << demangledTypeName (R_internal) << endl
       << "  XMV_Internal: " << demangledTypeName (X_internal) << endl
       << endl;
#endif // KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO

  Impl::Sum<RV_Internal, XMV_Internal>::sum (R_internal, X_internal);
}

/// \brief Compute the "weighted 2-norm" of each column of X, using
///   weights in the corresponding column of W, and write the result
///   to the corresponding entry of R.
///
/// For single vectors X and W, the "weighted 2-norm" is the 2-norm of
/// the entry-wise quotient X(i) / W(i).  X and W have the same type.
template<class RV, class XMV>
void
nrm2w_squared (const RV& R, const XMV& X, const XMV& W)
{
  static_assert (Kokkos::Impl::is_view<RV>::value, "KokkosBlas::nrm2w_squared: "
                 "R is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_view<XMV>::value, "KokkosBlas::nrm2w_squared: "
                 "X is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_same<typename RV::value_type,
                 typename RV::non_const_value_type>::value,
                 "KokkosBlas::nrm2w_squared: R is const.  "
                 "It must be nonconst, because it is an output argument "
                 "(we have to be able to write to its entries).");
  static_assert ((RV::rank == 0 && XMV::rank == 1) || (RV::rank == 1 && XMV::rank == 2),
                 "KokkosBlas::nrm2w_squared: Ranks of R and X do not match.  "
                 "If R has rank 0, X and W must have rank 1.  "
                 "If R has rank 1, X and W must have rank 2.");

  // Check compatibility of dimensions at run time.
  if (X.dimension_0 () != W.dimension_0 () ||
      X.dimension_1 () != W.dimension_1 () ||
      R.dimension_0 () != X.dimension_1 ()) {
    std::ostringstream os;
    os << "KokkosBlas::nrm2w_squared: Dimensions do not match: "
       << "R: " << R.dimension_0 () << " x 1"
       << ", X: " << X.dimension_0 () << " x " << X.dimension_1 ()
       << ", W: " << W.dimension_0 () << " x " << W.dimension_1 ();
    Kokkos::Impl::throw_runtime_exception (os.str ());
  }

  // Create unmanaged versions of the input Views.  XMV may be rank 1
  // or rank 2, and RV may be rank 0 or rank 1.
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      RV::rank == 0,
      typename RV::non_const_value_type,
      typename RV::non_const_value_type* >::type,
    typename RV::array_layout,
    typename RV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > RV_Internal;

  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      XMV::rank == 1,
      typename XMV::const_value_type*,
      typename XMV::const_value_type** >::type,
    typename XMV::array_layout,
    typename XMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > XMV_Internal;

  RV_Internal R_internal = R;
  XMV_Internal X_internal = X;
  XMV_Internal W_internal = W;

#ifdef KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO
  using std::cerr;
  using std::endl;
  cerr << "KokkosBlas::nrm2w_squared:" << endl
       << "  RV_Internal: " << demangledTypeName (R_internal) << endl
       << "  XMV_Internal: " << demangledTypeName (X_internal) << endl
       << endl;
#endif // KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO

  Impl::Nrm2w<RV_Internal, XMV_Internal>::nrm2w_squared (R_internal, X_internal, W_internal);
}


template<class CMV, class AV, class BMV>
void
mult (typename CMV::const_value_type& c,
      const CMV& C,
      typename AV::const_value_type& ab,
      const AV& A,
      const BMV& B)
{
  static_assert (Kokkos::Impl::is_view<CMV>::value, "KokkosBlas::mult: "
                 "C is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_view<AV>::value, "KokkosBlas::mult: "
                 "A is not a Kokkos::View.");
  static_assert (Kokkos::Impl::is_same<typename CMV::value_type,
                   typename CMV::non_const_value_type>::value,
                 "KokkosBlas::mult: C is const.  "
                 "It must be nonconst, because it is an output argument "
                 "(we have to be able to write to its entries).");
  static_assert ((BMV::rank == 1 && CMV::rank == 1) ||
                 (BMV::rank == 2 && CMV::rank == 2),
                 "KokkosBlas::mult: C and B must be either both rank 1, "
                 "or both rank 2.");
  static_assert (AV::rank == 1, "KokkosBlas::mult: A must have rank 1.");

  // Check compatibility of dimensions at run time.
  if (C.dimension_0 () != A.dimension_0 () ||
      C.dimension_0 () != B.dimension_0 () ||
      C.dimension_1 () != B.dimension_1 ()) {
    std::ostringstream os;
    os << "KokkosBlas::mult: Dimensions do not match: "
       << "C: " << C.dimension_0 () << " x " << C.dimension_1 ()
       << ", A: " << A.dimension_0 () << " x " << A.dimension_0 ()
       << ", B: " << B.dimension_0 () << " x " << B.dimension_1 ();
    Kokkos::Impl::throw_runtime_exception (os.str ());
  }

  // Create unmanaged versions of the input Views.
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      CMV::rank == 1,
      typename CMV::non_const_value_type*,
      typename CMV::non_const_value_type** >::type,
    typename CMV::array_layout,
    typename CMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > CMV_Internal;
  typedef Kokkos::View<
    typename AV::const_value_type*,
    typename AV::array_layout,
    typename AV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > AV_Internal;
  typedef Kokkos::View<
    typename Kokkos::Impl::if_c<
      BMV::rank == 1,
      typename BMV::const_value_type*,
      typename BMV::const_value_type** >::type,
    typename BMV::array_layout,
    typename BMV::device_type,
    Kokkos::MemoryTraits<Kokkos::Unmanaged> > BMV_Internal;

  CMV_Internal C_internal = C;
  AV_Internal A_internal = A;
  BMV_Internal B_internal = B;

#ifdef KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO
  using std::cerr;
  using std::endl;
  cerr << "KokkosBlas::mult:" << endl
       << "  CMV_Internal: " << demangledTypeName (C_internal) << endl
       << "  AV_Internal: " << demangledTypeName (A_internal) << endl
       << "  BMV_Internal: " << demangledTypeName (B_internal) << endl
       << endl;
#endif // KOKKOSKERNELS_PRINT_DEMANGLED_TYPE_INFO

  Impl::Mult<CMV_Internal, AV_Internal, BMV_Internal>::mult (c, C_internal, ab,
                                                             A_internal, B_internal);
}

} // namespace KokkosBlas

#endif // KOKKOS_BLAS1_MV_HPP_