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Let p be the proportion of positive examples in a node in a decision tree classifier trained for a binary classification task. The Gini impurity

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Let p be the proportion of positive examples in a node in a decision tree classifier trained for a binary classification task. The Gini impurity score for the node: Is minimized when p=1 and maximized when p=0.5. Is undefined. Is maximized p=1 and minimized when p=0.5. Can be any value between 1 and +1

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