105 lines
4.1 KiB
C++
105 lines
4.1 KiB
C++
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// Boost.Geometry Index
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//
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// R-tree kmeans split algorithm implementation
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//
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// Copyright (c) 2011-2013 Adam Wulkiewicz, Lodz, Poland.
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//
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// This file was modified by Oracle on 2021.
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// Modifications copyright (c) 2021 Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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//
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_INDEX_DETAIL_RTREE_KMEANS_SPLIT_HPP
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#define BOOST_GEOMETRY_INDEX_DETAIL_RTREE_KMEANS_SPLIT_HPP
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#include <boost/geometry/index/detail/rtree/node/concept.hpp>
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#include <boost/geometry/index/detail/rtree/visitors/insert.hpp>
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namespace boost { namespace geometry { namespace index {
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namespace detail { namespace rtree {
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// TODO: This should be defined in options.hpp
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// For now it's defined here to satisfy Boost header policy
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struct split_kmeans_tag {};
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namespace kmeans {
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// some details
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} // namespace kmeans
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// split_kmeans_tag
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// OR
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// split_clusters_tag and redistribute_kmeans_tag - then redistribute will probably slightly different interface
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// or some other than "redistribute"
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// 1. for this algorithm one probably MUST USE NON-STATIC NODES with node_default_tag
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// or the algorithm must be changed somehow - to not store additional nodes in the current node
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// but return excessive element/elements container instead (possibly pushable_array<1> or std::vector)
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// this would also cause building of smaller trees since +1 element in nodes wouldn't be needed in different redistributing algorithms
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// 2. it is probably possible to add e.g. 2 levels of tree in one insert
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// Edge case is that every node split generates M + 1 children, in parent containing M nodes
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// result is 2M + 1 nodes in parent on this level
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// On next level the same, next the same and so on.
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// We have Depth*M+1 nodes in the root
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// The tree may then gain some > 1 levels in one insert
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// split::apply() manages this but special attention is required
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// which algorithm should be used to choose current node in traversing while inserting?
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// some of the currently used ones or some using mean values as well?
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// TODO
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// 1. Zmienic troche algorytm zeby przekazywal nadmiarowe elementy do split
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// i pobieral ze split nadmiarowe elementy rodzica
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// W zaleznosci od algorytmu w rozny sposob - l/q/r* powinny zwracac np pushable_array<1>
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// wtedy tez is_overerflow (z R* insert?) bedzie nieportrzebne
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// Dla kmeans zapewne std::vector, jednak w wezlach nadal moglaby byc pushable_array
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// 2. Fajnie byloby tez uproscic te wszystkie parametry root,parent,index itd. Mozliwe ze okazalyby sie zbedne
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// 3. Sprawdzyc czasy wykonywania i zajetosc pamieci
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// 4. Pamietac o parametryzacji kontenera z nadmiarowymi elementami
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// PS. Z R* reinsertami moze byc masakra
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template <typename MembersHolder>
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class split<MembersHolder, split_kmeans_tag>
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{
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protected:
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typedef typename MembersHolder::parameters_type parameters_type;
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typedef typename MembersHolder::box_type box_type;
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typedef typename MembersHolder::translator_type translator_type;
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typedef typename MembersHolder::allocators_type allocators_type;
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typedef typename MembersHolder::size_type size_type;
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typedef typename MembersHolder::node node;
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typedef typename MembersHolder::internal_node internal_node;
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typedef typename MembersHolder::leaf leaf;
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public:
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typedef index::detail::varray
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<
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typename rtree::elements_type<internal_node>::type::value_type,
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1
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> nodes_container_type;
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template <typename Node>
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static inline void apply(nodes_container_type & additional_nodes,
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Node & n,
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box_type & n_box,
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parameters_type const& parameters,
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translator_type const& translator,
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allocators_type & allocators)
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{
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}
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};
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}} // namespace detail::rtree
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}}} // namespace boost::geometry::index
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#endif // BOOST_GEOMETRY_INDEX_DETAIL_RTREE_KMEANS_SPLIT_HPP
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