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add contract between Tensor3 and Matrix #90

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add contract between Tensor3 and Matrix #90

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28 changes: 28 additions & 0 deletions src/Picasso_BatchedLinearAlgebra.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4523,6 +4523,34 @@ KOKKOS_INLINE_FUNCTION auto contract( const ExpressionT& t,
return res;
}

template <class ExpressionT, class ExpressionM,
typename std::enable_if_t<is_tensor3<ExpressionT>::value &&
is_matrix<ExpressionM>::value,
int> = 0>
KOKKOS_INLINE_FUNCTION auto contract( const ExpressionT& t,
const ExpressionM& m )
{
static_assert( ExpressionT::extent_1 == ExpressionM::extent_0,
"Inner extents must match" );
static_assert( ExpressionT::extent_2 == ExpressionM::extent_1,
"Inner extents must match " );

typename ExpressionT::eval_type t_eval = t;
typename ExpressionM::eval_type m_eval = m;
Vector<typename ExpressionT::value_type, ExpressionT::extent_0> res =
static_cast<typename ExpressionT::value_type>( 0 );

for ( int i = 0; i < ExpressionT::extent_0; ++i )
#if defined( KOKKOS_ENABLE_PRAGMA_UNROLL )
#pragma unroll
#endif
for ( int j = 0; j < ExpressionM::extent_0; ++j )
for ( int k = 0; k < ExpressionM::extent_1; ++k )
res( i ) += t_eval( i, j, k ) * m_eval( j, k );

return res;
}

template <class ExpressionT, class ExpressionM,
typename std::enable_if_t<is_tensor4<ExpressionT>::value &&
is_matrix<ExpressionM>::value,
Expand Down