5. The method of claim 4 , wherein the computing the first and second feature scores further comprises: (i) applying a machine learning model to the respective items of evidence, and (ii) computing a weighted sum of a set of values for each of the feature in the respective sets of features.
5. The method of claim 4 , wherein the computing the first and second feature scores further comprises: (i) applying a machine learning model to the respective items of evidence, and (ii) computing a weighted sum of a set of values for each of the feature in the respective sets of features. 6. The method of claim 5 , further comprising training the question answering system to produce the machine learning model.