Class SearchTreeNode.Settings

java.lang.Object

gametree.SearchTreeNode.Settings

All Implemented Interfaces:

Serializable

Enclosing class:

SearchTreeNode<P extends IGamePosition<P>>

public static class SearchTreeNode.Settings
extends Object
implements Serializable

A class that stores the settings for a SearchTreeNode tree. All nodes in the tree hold a reference to the same SearchTreeNode.Settings object that was used to initialise the tree. The Settings object also holds temporary information such as whether the tree has been frozen (to prevent expansions) or whether pruning is enabled (to reduce memory usage).

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
boolean	allow_manual_edits
boolean	frozen
long	irrelevance_pruning_depth
long	position_pruning_depth
boolean	prune_irrelevance
boolean	prune_irrelevance_light
boolean	prune_positions

Constructor Summary

Constructors

Constructor	Description
Settings()
Settings(boolean enable_position_pruning, long minimum_depth_to_prune_positions, boolean enable_irrelevance_pruning, long minimum_depth_to_prune_irrelevance, boolean incorrect_bounds_protection)	[NOTE] if 'enable_position_pruning', 'enable_irrelevance_pruning' and 'incorrect_bounds_protection' are all true, re-visited irrelevant nodes may trigger a null error.
Settings(long minimum_depth_to_prune_positions, long minimum_depth_to_prune_irrelevance)
Settings(long minimum_depth_to_prune_positions, long minimum_depth_to_prune_irrelevance, boolean incorrect_bounds_protection)

Method Summary

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

frozen

public boolean frozen

allow_manual_edits

public boolean allow_manual_edits

prune_positions

public boolean prune_positions

position_pruning_depth

public long position_pruning_depth

prune_irrelevance

public boolean prune_irrelevance

irrelevance_pruning_depth

public long irrelevance_pruning_depth

prune_irrelevance_light

public boolean prune_irrelevance_light

Constructor Details

Settings

public Settings()

Settings

public Settings(long minimum_depth_to_prune_positions,
 long minimum_depth_to_prune_irrelevance)

Settings

public Settings(long minimum_depth_to_prune_positions,
 long minimum_depth_to_prune_irrelevance,
 boolean incorrect_bounds_protection)

Settings

public Settings(boolean enable_position_pruning,
 long minimum_depth_to_prune_positions,
 boolean enable_irrelevance_pruning,
 long minimum_depth_to_prune_irrelevance,
 boolean incorrect_bounds_protection)

[NOTE] if 'enable_position_pruning', 'enable_irrelevance_pruning' and 'incorrect_bounds_protection' are all true, re-visited irrelevant nodes may trigger a null error. To prevent this, disable 'enable_position_pruning' in any trees with a (partially) incorrect evaluation function (bounds that are not 100% accurate).

Parameters:

enable_position_pruning - to enable the pruning of irrelevant game positions (not recommended if the evaluation function has incorrect bounds)

minimum_depth_to_prune_positions - the minimum depth from which positions will be pruned

enable_irrelevance_pruning - to enable the pruning of irrelevant nodes

minimum_depth_to_prune_irrelevance - the minimum depth from which irrelevant nodes will be pruned

incorrect_bounds_protection - keeps nodes otherwise pruned by irrelevance pruning around, but only removes their children. Requires the GameTreeNode.position() to not be null if ever revisited by the search.