public class MiddleOutConstructor extends BallTreeConstructor implements Randomizable, TechnicalInformationHandler
@inproceedings{Moore2000, address = {San Francisco, CA, USA}, author = {Andrew W. Moore}, booktitle = {UAI '00: Proceedings of the 16th Conference on Uncertainty in Artificial Intelligence}, pages = {397-405}, publisher = {Morgan Kaufmann Publishers Inc.}, title = {The Anchors Hierarchy: Using the Triangle Inequality to Survive High Dimensional Data}, year = {2000} } @mastersthesis{Kibriya2007, address = {Hamilton, New Zealand}, author = {Ashraf Masood Kibriya}, school = {Department of Computer Science, School of Computing and Mathematical Sciences, University of Waikato}, title = {Fast Algorithms for Nearest Neighbour Search}, year = {2007} }Valid options are:
-S <num> The seed for the random number generator used in selecting random anchor. (default: 1)
-R Use randomly chosen initial anchors.
Constructor and Description |
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MiddleOutConstructor()
Creates a new instance of MiddleOutConstructor.
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Modifier and Type | Method and Description |
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int[] |
addInstance(BallNode node,
Instance inst)
Adds an instance to the tree.
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BallNode |
buildTree()
Builds a ball tree middle out.
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Instance |
calcPivot(weka.core.neighboursearch.balltrees.MiddleOutConstructor.MyIdxList list1,
weka.core.neighboursearch.balltrees.MiddleOutConstructor.MyIdxList list2,
Instances insts)
Calculates the centroid pivot of a node based on
the list of points that it contains (tbe two
lists of its children are provided).
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Instance |
calcPivot(weka.core.neighboursearch.balltrees.MiddleOutConstructor.TempNode node1,
weka.core.neighboursearch.balltrees.MiddleOutConstructor.TempNode node2,
Instances insts)
/**
Calculates the centroid pivot of a node based on its
two child nodes (if merging two nodes).
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double |
calcRadius(weka.core.neighboursearch.balltrees.MiddleOutConstructor.MyIdxList list1,
weka.core.neighboursearch.balltrees.MiddleOutConstructor.MyIdxList list2,
Instance pivot,
Instances insts)
Calculates the radius of a node based on the
list of points that it contains (the two lists of
its children are provided).
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double |
calcRadius(weka.core.neighboursearch.balltrees.MiddleOutConstructor.TempNode n1,
weka.core.neighboursearch.balltrees.MiddleOutConstructor.TempNode n2)
Calculates the radius of a node based on its two
child nodes (if merging two nodes).
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void |
checkIndicesList(weka.core.neighboursearch.balltrees.MiddleOutConstructor.MyIdxList list,
int startidx,
int endidx)
Checks whether if the points in an index list
are in some specified of the master index array.
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java.lang.String[] |
getOptions()
Gets the current settings of this BallTree MiddleOutConstructor.
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java.lang.String |
getRevision()
Returns the revision string.
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int |
getSeed()
Returns the seed for random number generator.
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TechnicalInformation |
getTechnicalInformation()
Returns an instance of a TechnicalInformation object, containing detailed
information about the technical background of this class, e.g., paper
reference or book this class is based on.
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java.lang.String |
globalInfo()
Returns a string describing this nearest neighbour search algorithm.
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java.lang.String |
initialAnchorRandomTipText()
Returns the tip text for this property.
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boolean |
isInitialAnchorRandom()
Gets whether if the initial anchor is chosen randomly.
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java.util.Enumeration |
listOptions()
Returns an enumeration describing the available options.
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java.lang.String |
printInsts(int startIdx,
int endIdx)
For printing indices in some given portion
of the master index array.
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java.lang.String |
printList(weka.core.neighboursearch.balltrees.MiddleOutConstructor.MyIdxList points)
For printing indices in a given point list.
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java.lang.String |
seedTipText()
Returns the tip text for this property.
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void |
setInitialAnchorRandom(boolean randomInitialAnchor)
Sets whether if the initial anchor is chosen randomly.
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void |
setInstanceList(int[] instList)
Sets the master index array that points to
instances in m_Instances, so that only this array
is manipulated, and m_Instances is left
untouched.
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void |
setInstances(Instances insts)
Sets the instances on which the tree is to be built.
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void |
setInterAnchorDistances(java.util.Vector anchors,
weka.core.neighboursearch.balltrees.MiddleOutConstructor.TempNode newAnchor,
java.util.Vector anchorDistances)
Sets the distances of a supplied new
anchor to all the rest of the
previous anchor points.
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void |
setMaxInstancesInLeaf(int num)
Sets the maximum number of instances allowed in a leaf.
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void |
setOptions(java.lang.String[] options)
Parses a given list of options.
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void |
setPoints(weka.core.neighboursearch.balltrees.MiddleOutConstructor.TempNode node,
int startIdx,
int endIdx,
int[] indices)
Sets the points of an anchor node.
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void |
setSeed(int seed)
Sets the seed for random number generator
(that is used for selecting the first anchor
point randomly).
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boolean |
stealPoints(weka.core.neighboursearch.balltrees.MiddleOutConstructor.TempNode newAnchor,
java.util.Vector anchors,
java.util.Vector anchorDistances)
Removes points from old anchors that
are nearer to the given new anchor and
adds them to the list of points of the
new anchor.
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containChildBallsTipText, getContainChildBalls, getMaxDepth, getMaxInstancesInLeaf, getMaxRelativeLeafRadius, getNumLeaves, getNumNodes, maxInstancesInLeafTipText, maxRelativeLeafRadiusTipText, setContainChildBalls, setEuclideanDistanceFunction, setMaxRelativeLeafRadius
public MiddleOutConstructor()
public java.lang.String globalInfo()
public TechnicalInformation getTechnicalInformation()
getTechnicalInformation
in interface TechnicalInformationHandler
public BallNode buildTree() throws java.lang.Exception
buildTree
in class BallTreeConstructor
java.lang.Exception
- If there is problem building
the tree.public void setPoints(weka.core.neighboursearch.balltrees.MiddleOutConstructor.TempNode node, int startIdx, int endIdx, int[] indices)
node
- The node in which the points are
needed to be set.startIdx
- The start of the portion in
the given index array (the master index
array).endIdx
- The end of the portion in the
given index array.indices
- The index array.public void setInterAnchorDistances(java.util.Vector anchors, weka.core.neighboursearch.balltrees.MiddleOutConstructor.TempNode newAnchor, java.util.Vector anchorDistances) throws java.lang.Exception
anchors
- The old anchor points.newAnchor
- The new anchor point.anchorDistances
- The vector to
store the distances of newAnchor to
each of the old anchors.java.lang.Exception
- If there is some
problem in calculating the distances.public boolean stealPoints(weka.core.neighboursearch.balltrees.MiddleOutConstructor.TempNode newAnchor, java.util.Vector anchors, java.util.Vector anchorDistances)
newAnchor
- The new anchor.anchors
- The old anchors.anchorDistances
- The distances
of new anchor to each of the old
anchors.public Instance calcPivot(weka.core.neighboursearch.balltrees.MiddleOutConstructor.TempNode node1, weka.core.neighboursearch.balltrees.MiddleOutConstructor.TempNode node2, Instances insts)
node1
- The first child.node2
- The second child.insts
- The set of instances on which the tree
is being built (as dataset header information is
required).public Instance calcPivot(weka.core.neighboursearch.balltrees.MiddleOutConstructor.MyIdxList list1, weka.core.neighboursearch.balltrees.MiddleOutConstructor.MyIdxList list2, Instances insts)
list1
- The point index list of first child.list2
- The point index list of second
child.insts
- The insts object on which the tree
is being built (for header information).public double calcRadius(weka.core.neighboursearch.balltrees.MiddleOutConstructor.TempNode n1, weka.core.neighboursearch.balltrees.MiddleOutConstructor.TempNode n2)
n1
- The first child of the node.n2
- The second child of the node.java.lang.Exception
public double calcRadius(weka.core.neighboursearch.balltrees.MiddleOutConstructor.MyIdxList list1, weka.core.neighboursearch.balltrees.MiddleOutConstructor.MyIdxList list2, Instance pivot, Instances insts)
list1
- The point index list of first child.list2
- The point index list of second child.pivot
- The centre/pivot of the node.insts
- The instances on which the tree is
being built (for header info).public int[] addInstance(BallNode node, Instance inst) throws java.lang.Exception
addInstance
in class BallTreeConstructor
node
- The root of the tree to which the
instance is to be added.inst
- The instance to add to the tree.java.lang.Exception
- Always as this implementation of
MiddleOutConstructor doesn't support addition of
instances after batch construction of the tree.public void setMaxInstancesInLeaf(int num) throws java.lang.Exception
setMaxInstancesInLeaf
in class BallTreeConstructor
num
- The maximum number of instances allowed in
a leaf.java.lang.Exception
- If the num is < 2, as the method
cannot work for < 2 instances.public void setInstances(Instances insts)
setInstances
in class BallTreeConstructor
inst
- The instances on which to build the
ball tree.public void setInstanceList(int[] instList)
setInstanceList
in class BallTreeConstructor
instList
- The master index array.public java.lang.String initialAnchorRandomTipText()
public boolean isInitialAnchorRandom()
public void setInitialAnchorRandom(boolean randomInitialAnchor)
randomInitialAnchor
- Should be true if the first
anchor is to be chosen randomly.public java.lang.String seedTipText()
public int getSeed()
getSeed
in interface Randomizable
public void setSeed(int seed)
setSeed
in interface Randomizable
seed
- The seed.public java.util.Enumeration listOptions()
listOptions
in interface OptionHandler
listOptions
in class BallTreeConstructor
public void setOptions(java.lang.String[] options) throws java.lang.Exception
-S <num> The seed for the random number generator used in selecting random anchor. (default: 1)
-R Use randomly chosen initial anchors.
setOptions
in interface OptionHandler
setOptions
in class BallTreeConstructor
options
- the list of options as an array of stringsjava.lang.Exception
- if an option is not supportedpublic java.lang.String[] getOptions()
getOptions
in interface OptionHandler
getOptions
in class BallTreeConstructor
public void checkIndicesList(weka.core.neighboursearch.balltrees.MiddleOutConstructor.MyIdxList list, int startidx, int endidx) throws java.lang.Exception
list
- The point list.startidx
- The start of the portion in
master index array.endidx
- The end of the portion in master
index array.java.lang.Exception
- If some point in the point
list is not in the specified portion of master
index array.public java.lang.String printInsts(int startIdx, int endIdx)
startIdx
- The start of the portion
in master index array.endIdx
- The end of the portion in
master index array.public java.lang.String printList(weka.core.neighboursearch.balltrees.MiddleOutConstructor.MyIdxList points)
points
- The point list.public java.lang.String getRevision()
getRevision
in interface RevisionHandler
getRevision
in class BallTreeConstructor