Lära Understanding Decision Rules | Foundations of Rule-Based Machine Learning

Decision rules are the fundamental building blocks of rule-based machine learning systems. At their core, decision rules use an if–then structure to map specific data conditions to outcomes or predictions. This structure makes them both intuitive and interpretable: you can easily see why a rule fires and what decision it leads to. The if part of the rule, known as the antecedent, specifies the condition or set of conditions that must be met. The then part, called the consequent, states the outcome or action that follows if the antecedent is true.

Boolean logic is central to how decision rules operate. Each condition in the antecedent is evaluated as either True or False, allowing the rule to trigger only when all its requirements are satisfied. This logical structure enables rule-based systems to make clear, step-by-step decisions, which is especially valuable in domains where transparency and explainability are crucial.


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def classify_record(record):
    # Antecedent: if age is greater than 30 and income is above 50000
    if record["age"] > 30 and record["income"] > 50000:
        # Consequent: then classify as 'high_value'
        return "high_value"
    else:
        return "standard"
        
# Example usage:
sample = {"age": 35, "income": 60000}
print(classify_record(sample))  # Output: high_value

In the code above, you see a simple function that applies a decision rule to a single data record. The antecedent is the condition inside the if statement: record["age"] > 30 and record["income"] > 50000. This checks whether both the age is greater than 30 and the income exceeds 50,000. If this combined condition evaluates to True (using boolean logic), the function returns 'high_value'—this is the consequent. If the condition is False, the function returns 'standard'. This clear separation between the condition (antecedent) and the result (consequent) is what makes decision rules straightforward to interpret and use in machine learning systems.

Definition

Antecedent: the "if" part of a rule; the condition(s) that must be true for the rule to apply;
Consequent: the "then" part of a rule; the outcome or action taken when the antecedent is true;
Boolean logic: the system of logic based on True/False values, used to evaluate conditions in rules.

These concepts are essential because they allow rule-based machine learning systems to make transparent, logical decisions that can be easily understood and audited.

1. Given the rule: "If temperature is below 0, then label as 'freezing'". Which part is the antecedent, and which is the consequent?

2. What is the primary role of boolean logic in rule-based machine learning systems?

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              1234567891011
            
def classify_record(record):
    # Antecedent: if age is greater than 30 and income is above 50000
    if record["age"] > 30 and record["income"] > 50000:
        # Consequent: then classify as 'high_value'
        return "high_value"
    else:
        return "standard"
        
# Example usage:
sample = {"age": 35, "income": 60000}
print(classify_record(sample))  # Output: high_value