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/*
* Copyright 2008-2009 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <cusp/exception.h>
#include <cusp/coo_matrix.h>
#include <cusp/csr_matrix.h>
#include <cusp/graph/detail/dispatch/maximal_independent_set.h>
#include <thrust/fill.h>
namespace cusp
{
namespace graph
{
namespace detail
{
//////////////////
// General Path //
//////////////////
template <typename Matrix, typename Array>
size_t maximal_independent_set(const Matrix& A, Array& stencil, size_t k,
cusp::coo_format, cusp::device_memory)
{
typedef typename Matrix::index_type IndexType;
typedef typename Matrix::value_type ValueType;
return cusp::graph::detail::dispatch::maximal_independent_set(A, stencil, k, typename Matrix::memory_space());
}
template <typename Matrix, typename Array,
typename Format>
size_t maximal_independent_set(const Matrix& A, Array& stencil, size_t k,
Format, cusp::device_memory)
{
typedef typename Matrix::index_type IndexType;
typedef typename Matrix::value_type ValueType;
// convert matrix to COO format and compute on the device
cusp::coo_matrix<IndexType,ValueType,cusp::device_memory> A_coo(A);
return cusp::graph::detail::dispatch::maximal_independent_set(A_coo, stencil, k, typename Matrix::memory_space());
}
template <typename Matrix, typename Array>
size_t maximal_independent_set(const Matrix& A, Array& stencil, size_t k,
cusp::csr_format, cusp::host_memory)
{
typedef typename Matrix::index_type IndexType;
typedef typename Matrix::value_type ValueType;
return cusp::graph::detail::dispatch::maximal_independent_set(A, stencil, k, typename Matrix::memory_space());
}
template <typename Matrix, typename Array,
typename Format>
size_t maximal_independent_set(const Matrix& A, Array& stencil, size_t k,
Format, cusp::host_memory)
{
typedef typename Matrix::index_type IndexType;
typedef typename Matrix::value_type ValueType;
// convert matrix to CSR format and compute on the host
cusp::csr_matrix<IndexType,ValueType,cusp::host_memory> A_csr(A);
return cusp::graph::detail::dispatch::maximal_independent_set(A_csr, stencil, k, typename Matrix::memory_space());
}
} // end namespace detail
/////////////////
// Entry Point //
/////////////////
template <typename Matrix, typename Array>
size_t maximal_independent_set(const Matrix& A, Array& stencil, size_t k)
{
CUSP_PROFILE_SCOPED();
if(A.num_rows != A.num_cols)
throw cusp::invalid_input_exception("matrix must be square");
if (k == 0)
{
stencil.resize(A.num_rows);
thrust::fill(stencil.begin(), stencil.end(), typename Array::value_type(1));
return stencil.size();
}
else
{
return cusp::graph::detail::maximal_independent_set(A, stencil, k, typename Matrix::format(), typename Matrix::memory_space());
}
}
} // end namespace graph
} // end namespace cusp
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