id3
Class AttrCategorizer

java.lang.Object
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  +--shared.Globals
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        +--shared.Categorizer
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              +--id3.NodeCategorizer
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                    +--id3.AttrCategorizer

public class AttrCategorizer

extends NodeCategorizer

The AttrCategorizer categorizes an Instance based on an attribute. Assumes the attribute is of a type derived from Nominal.

Fields inherited from class shared.Categorizer

CATEGORIZER_ID_BASE, CLASS_ATTR_CATEGORIZER, CLASS_ATTR_EQ_CATEGORIZER, CLASS_ATTR_SUBSET_CATEGORIZER, CLASS_BAD_CATEGORIZER, CLASS_BAGGING_CATEGORIZER, CLASS_CASCADE_CATEGORIZER, CLASS_CLUSTER_CATEGORIZER, CLASS_CONST_CATEGORIZER, CLASS_CONSTRUCT_CATEGORIZER, CLASS_DISC_CATEGORIZER, CLASS_DISC_NODE_CATEGORIZER, CLASS_DTREE_CATEGORIZER, CLASS_IB_CATEGORIZER, CLASS_LAZYDT_CATEGORIZER, CLASS_LEAF_CATEGORIZER, CLASS_LINDISCR_CATEGORIZER, CLASS_MAJORITY_CATEGORIZER, CLASS_MULTI_SPLIT_CATEGORIZER, CLASS_MULTITHRESH_CATEGORIZER, CLASS_NB_CATEGORIZER, CLASS_ODT_CATEGORIZER, CLASS_ONE_R_CATEGORIZER, CLASS_OPTION_CATEGORIZER, CLASS_PROJECT_CATEGORIZER, CLASS_RDG_CATEGORIZER, CLASS_STACKING_CATEGORIZER, CLASS_TABLE_CATEGORIZER, CLASS_THRESHOLD_CATEGORIZER, logOptions

Fields inherited from class shared.Globals

badCategorizer, CONFIDENCE_INTERVAL_Z, DBG, DEFAULT_DATA_EXT, DEFAULT_EPSILON, DEFAULT_EVAL_LIMIT, DEFAULT_LAMBDA, DEFAULT_MAX_EVALS, DEFAULT_MAX_STALE, DEFAULT_MIN_EXP_EVALS, DEFAULT_NAMES_EXT, DEFAULT_SAS_SEED, DEFAULT_SEARCH_METHOD, DEFAULT_SHOW_TEST_SET_PERF, DEFAULT_TEST_EXT, DISPLAY_NAMES, EMPTY_STRING, FIRST_CATEGORY_VAL, FIRST_NOMINAL_VAL, LEFT_NODE, MAX_NUM_CATEGORIES, Mcerr, Mcout, optionServer, optionsFileName, REAL_MAX, RIGHT_NODE, SHOW_TEST_SET_PERF_HELP, SINGLE_QUOTE, STORED_REAL_MAX, TS, UNDEFINED_INT, UNDEFINED_REAL, UNDEFINED_VARIANCE, UNKNOWN_AUG_CATEGORY, UNKNOWN_CATEGORY_VAL, UNKNOWN_NODE, UNKNOWN_NOMINAL_VAL, UNKNOWN_STORED_REAL_VAL, UNKNOWN_VAL_STR

Constructor Summary

AttrCategorizer(Schema schma, int attributeNum, java.lang.String dscr)
Constructor.

Method Summary

AugCategory	branch(Instance inst) Choses the child branch that the given instance would go down.
int	class_id() Deprecated. Java's instanceof operator should be used instead.
void	display_struct(java.io.BufferedWriter stream, DisplayPref dp) Prints a readable representation of the Categorizer to the given stream.
static int	num_nominal_attr(Schema schema, int attrNum) Finds the number of attributes that are nominal in nature.
void	set_used_attr(boolean[] usedAttr) Updates usedAttr to include the attributes used in this categorizer.

Methods inherited from class id3.NodeCategorizer

add_instance_loss, categorize, distribute_instances, get_child_categorizer, get_child_categorizer, get_graph, get_loss, get_node, in_graph, reset_node_loss, score, score, set_graph_and_node, split_instance_list, stop, supports_scoring, toString, update_loss

Methods inherited from class shared.Categorizer

build_distr, clone, description, get_distr, get_log_level, get_log_options, get_log_stream, get_schema, has_distr, num_categories, set_description, set_distr, set_log_level, set_log_options, set_log_prefixes, set_log_stream, set_original_distr, total_weight

Methods inherited from class java.lang.Object

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

Constructor Detail

AttrCategorizer

public AttrCategorizer(Schema schma,
                       int attributeNum,
                       java.lang.String dscr)

Constructor.

Parameters:

schma - The schema for this categorizer.

attributeNum - The number of the specific attribute in the schema for the data.

dscr - The description of this categorizer.

Method Detail

num_nominal_attr

public static int num_nominal_attr(Schema schema,
                                   int attrNum)

Finds the number of attributes that are nominal in nature.

Parameters:

schema - The schema containing attribute and label information.

attrNum - The number of the specific attribute in the schema for the data.

Returns:

The number of nominal attributes.

class_id

public int class_id()

Deprecated. Java's instanceof operator should be used instead.

Identifies the class.

Returns:

A value uniquely identifying this object as an AttrCategorizer.

branch

public AugCategory branch(Instance inst)

Choses the child branch that the given instance would go down. Used for scoring, categorization, and splitting of InstanceLists.

Overrides:

branch in class NodeCategorizer

Parameters:

inst - The specified Instance.

Returns:

The AugCategory that correlates to the specified Instance.

display_struct

public void display_struct(java.io.BufferedWriter stream,
                           DisplayPref dp)

Prints a readable representation of the Categorizer to the given stream.

Overrides:

display_struct in class Categorizer

Parameters:

stream - The output stream to be written to.

dp - The preference settings for the display.

set_used_attr

public void set_used_attr(boolean[] usedAttr)

Updates usedAttr to include the attributes used in this categorizer.

Overrides:

set_used_attr in class Categorizer

Parameters:

usedAttr - A boolean array representing attributes. Each element set to TRUE indicates the attribute is used. It is FALSE otherwise. This method sets the appropriate attribute element to true.