Class Ruleset

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Instance Methods

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__init__(self)
Constructor for an empty ruleset.

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__str__(self)
String representation of the ruleset.

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append(self, rule)
Append a rule to the ruleset and modify ruleset's properties accordingly.

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print_rule_tree_2_6(ruleset, depth, pos_symbol, neg_symbol)
Print out the rules.

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print_rule_tree(ruleset, depth, pos_symbol, neg_symbol)
Print out the rules.

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integer

count_rules(ruleset)
Count the number of rules in a ruleset.

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boolean

improved_by(self, rule, datapoint_bits, c)
Check if adding a rule improves the ruleset by shortening its description length.

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Method Details

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append(self, rule)

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Append a rule to the ruleset and modify ruleset's properties accordingly.

Parameters:

rule (Rule) - rule to be added.

print_rule_tree_2_6(ruleset, depth, pos_symbol, neg_symbol)

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Print out the rules.

Can be used with Python 2.6+

Parameters:

ruleset (Ruleset) - rules to output.
depth (integer) - Current depth.
pos_symbol (string) - Symbol signifying positive classification.
neg_symbol (string) - Symbol signifying negative classification.

print_rule_tree(ruleset, depth, pos_symbol, neg_symbol)

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Print out the rules.

Parameters:

ruleset (Ruleset) - rules to output.
depth (integer) - Current depth.
pos_symbol (string) - Symbol signifying positive classification.
neg_symbol (string) - Symbol signifying negative classification.

count_rules(ruleset)

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Count the number of rules in a ruleset.

Parameters:

ruleset (Ruleset) - ruleset whose rules are to be counted.

Returns: integer

number of rules in the ruleset.

improved_by(self, rule, datapoint_bits, c)

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Check if adding a rule improves the ruleset by shortening its description length.

Parameters:

rule (Rule) - rule to be added.
datapoint_bits (float) - bits needed to encode one data point.
c (float) - Symbol signifying positive classification.

Returns: boolean

True if adding the rule to ruleset shortens its description length.