6. The system of claim 5 , the plurality of hypotheses having respective associated sets of key words, and the evidence classifier including a semantic distance classifier that matches words within the one or more text segments to the respective sets of key words associated with the plurality of hypotheses, the semantic classifier determining a hypothesis for the one or more text segments according to a distribution of the words in the one or more text segments among the respective sets of key words associated with the plurality of hypotheses.
6. The system of claim 5 , the plurality of hypotheses having respective associated sets of key words, and the evidence classifier including a semantic distance classifier that matches words within the one or more text segments to the respective sets of key words associated with the plurality of hypotheses, the semantic classifier determining a hypothesis for the one or more text segments according to a distribution of the words in the one or more text segments among the respective sets of key words associated with the plurality of hypotheses. 7. The system of claim 6 , wherein the occurrence of a key word from a set of key words associated with a given hypothesis within the one or more text segments represents a point associated with that hypothesis on the weighted graph, the selected hypothesis being selected as a weighted mean position of a plurality of points.