MLPACK
1.0.10
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The TreeTraits class provides compile-time information on the characteristics of a given tree type. More...
Static Public Attributes | |
static const bool | FirstPointIsCentroid = false |
This is true if Point(0) is the centroid of the node. More... | |
static const bool | HasOverlappingChildren = true |
This is true if the subspaces represented by the children of a node can overlap. More... | |
static const bool | HasSelfChildren = false |
This is true if the points contained in the first child of a node (Child(0)) are also contained in that node. More... | |
static const bool | RearrangesDataset = false |
This is true if the tree rearranges points in the dataset when it is built. More... | |
The TreeTraits class provides compile-time information on the characteristics of a given tree type.
These include traits such as whether or not a node knows the distance to its parent node, or whether or not the subspaces represented by children can overlap.
These traits can be used for static compile-time optimization:
The traits can also be used in conjunction with SFINAE to write specialized versions of functions:
In those two examples, the boost::enable_if<> class takes a boolean template parameter which allows that function to be called when the boolean is true.
Each trait must be a static const value and not a function; only const values can be used as template parameters (with the exception of constexprs, which are a C++11 feature; but MLPACK is not using C++11). By default (the unspecialized implementation of TreeTraits), each parameter is set to make as few assumptions about the tree as possible; so, even if TreeTraits is not specialized for a particular tree type, tree-based algorithms should still work.
When you write your own tree, you must specialize the TreeTraits class to your tree type and set the corresponding values appropriately. See mlpack/core/tree/binary_space_tree/traits.hpp for an example.
Definition at line 88 of file tree_traits.hpp.
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This is true if Point(0) is the centroid of the node.
Definition at line 100 of file tree_traits.hpp.
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This is true if the subspaces represented by the children of a node can overlap.
Definition at line 95 of file tree_traits.hpp.
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This is true if the points contained in the first child of a node (Child(0)) are also contained in that node.
Definition at line 106 of file tree_traits.hpp.
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This is true if the tree rearranges points in the dataset when it is built.
Definition at line 111 of file tree_traits.hpp.