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authorDongHun Kwak <dh0128.kwak@samsung.com>2016-10-06 10:38:45 +0900
committerDongHun Kwak <dh0128.kwak@samsung.com>2016-10-06 10:39:52 +0900
commit5cde13f21d36c7224b0e13d11c4b49379ae5210d (patch)
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Imported Upstream version 1.61.0
Change-Id: I96a1f878d1e6164f01e9aadd5147f38fca448d90 Signed-off-by: DongHun Kwak <dh0128.kwak@samsung.com>
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+//---------------------------------------------------------------------------//
+// Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
+//
+// Distributed under the Boost Software License, Version 1.0
+// See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt
+//
+// See http://boostorg.github.com/compute for more information.
+//---------------------------------------------------------------------------//
+
+#ifndef BOOST_COMPUTE_ALGORITHM_INNER_PRODUCT_HPP
+#define BOOST_COMPUTE_ALGORITHM_INNER_PRODUCT_HPP
+
+#include <boost/compute/system.hpp>
+#include <boost/compute/functional.hpp>
+#include <boost/compute/command_queue.hpp>
+#include <boost/compute/algorithm/accumulate.hpp>
+#include <boost/compute/container/vector.hpp>
+#include <boost/compute/iterator/transform_iterator.hpp>
+#include <boost/compute/iterator/zip_iterator.hpp>
+#include <boost/compute/functional/detail/unpack.hpp>
+
+namespace boost {
+namespace compute {
+
+/// Returns the inner product of the elements in the range
+/// [\p first1, \p last1) with the elements in the range beginning
+/// at \p first2.
+template<class InputIterator1, class InputIterator2, class T>
+inline T inner_product(InputIterator1 first1,
+ InputIterator1 last1,
+ InputIterator2 first2,
+ T init,
+ command_queue &queue = system::default_queue())
+{
+ typedef typename std::iterator_traits<InputIterator1>::value_type input_type;
+
+ ptrdiff_t n = std::distance(first1, last1);
+
+ return ::boost::compute::accumulate(
+ ::boost::compute::make_transform_iterator(
+ ::boost::compute::make_zip_iterator(
+ boost::make_tuple(first1, first2)
+ ),
+ detail::unpack(multiplies<input_type>())
+ ),
+ ::boost::compute::make_transform_iterator(
+ ::boost::compute::make_zip_iterator(
+ boost::make_tuple(last1, first2 + n)
+ ),
+ detail::unpack(multiplies<input_type>())
+ ),
+ init,
+ queue
+ );
+}
+
+/// \overload
+template<class InputIterator1,
+ class InputIterator2,
+ class T,
+ class BinaryAccumulateFunction,
+ class BinaryTransformFunction>
+inline T inner_product(InputIterator1 first1,
+ InputIterator1 last1,
+ InputIterator2 first2,
+ T init,
+ BinaryAccumulateFunction accumulate_function,
+ BinaryTransformFunction transform_function,
+ command_queue &queue = system::default_queue())
+{
+ typedef typename std::iterator_traits<InputIterator1>::value_type value_type;
+
+ size_t count = detail::iterator_range_size(first1, last1);
+ vector<value_type> result(count, queue.get_context());
+ transform(first1,
+ last1,
+ first2,
+ result.begin(),
+ transform_function,
+ queue);
+
+ return ::boost::compute::accumulate(result.begin(),
+ result.end(),
+ init,
+ accumulate_function,
+ queue);
+}
+
+} // end compute namespace
+} // end boost namespace
+
+#endif // BOOST_COMPUTE_ALGORITHM_INNER_PRODUCT_HPP