Table 4 

Features used to score candidate answer justifications represented as TAGs.

FeatureDescription
TAG-level features 
numFocusQ Number of unique Q focus words present in the TAG 
numFocusA Number of unique A focus words present in the TAG 
massFocusQ Sum of the unique Q focus word weights present in the TAG 
massFocusA Sum of the unique A focus word weights present in the TAG 
numRepeatedFocus Number of focus words contained in more than one graphlet, with repetition 
numOtherAnswerF Negative predictor: the number of focus words from other multiple choice answers included in the current TAG 
minConcShared The minimum psycholinguistic concreteness score (i.e., abstractness) of any shared word in the TAG 
 
Nugget-level features 
numNugF Number of nuggets that are entirely focus words 
numNugFS Number of nuggets that contain only focus words and shared words 
numNugFSO Number of nuggets that contain focus, shared, and other unmatched words 
numNugFO Number of nuggets that contain only focus words and other words 
numNugS Number of nuggets that contain only shared words 
numNugSO Number of nuggets that contain only shared words and other words 
numNugO Number of nuggets that contain only other words 
numDefinedFocus Number of nuggets containing only focus words with outgoing definition edge 
numDefinedShared Number of nuggets containing only shared words with outgoing definition edge 
numQLinksFocus Number of nuggets containing only focus words that have an incoming labeled link (e.g., definition, instrument, process, temporal) 
numQLinksShared Number of nuggets containing only shared words that have an incoming labeled link 
numNuggetMultiF Number of nuggets that contain more than one focus word 
 
Bridge features 
massMaxBridgeScore Bridge graphlets are graphlets that contain at least one focus word from both the 
massMinBridgeScore question and answer, signifying that they are highly relevant to the question and the 
massDeltaBridgeScore corresponding answer. A graphlet's bridge score is the sum of this focus word mass. We calculate the minimum, maximum, and delta (max − min) bridge scores across all graphlets within a TAG 
FeatureDescription
TAG-level features 
numFocusQ Number of unique Q focus words present in the TAG 
numFocusA Number of unique A focus words present in the TAG 
massFocusQ Sum of the unique Q focus word weights present in the TAG 
massFocusA Sum of the unique A focus word weights present in the TAG 
numRepeatedFocus Number of focus words contained in more than one graphlet, with repetition 
numOtherAnswerF Negative predictor: the number of focus words from other multiple choice answers included in the current TAG 
minConcShared The minimum psycholinguistic concreteness score (i.e., abstractness) of any shared word in the TAG 
 
Nugget-level features 
numNugF Number of nuggets that are entirely focus words 
numNugFS Number of nuggets that contain only focus words and shared words 
numNugFSO Number of nuggets that contain focus, shared, and other unmatched words 
numNugFO Number of nuggets that contain only focus words and other words 
numNugS Number of nuggets that contain only shared words 
numNugSO Number of nuggets that contain only shared words and other words 
numNugO Number of nuggets that contain only other words 
numDefinedFocus Number of nuggets containing only focus words with outgoing definition edge 
numDefinedShared Number of nuggets containing only shared words with outgoing definition edge 
numQLinksFocus Number of nuggets containing only focus words that have an incoming labeled link (e.g., definition, instrument, process, temporal) 
numQLinksShared Number of nuggets containing only shared words that have an incoming labeled link 
numNuggetMultiF Number of nuggets that contain more than one focus word 
 
Bridge features 
massMaxBridgeScore Bridge graphlets are graphlets that contain at least one focus word from both the 
massMinBridgeScore question and answer, signifying that they are highly relevant to the question and the 
massDeltaBridgeScore corresponding answer. A graphlet's bridge score is the sum of this focus word mass. We calculate the minimum, maximum, and delta (max − min) bridge scores across all graphlets within a TAG 
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