14. The system of claim 13 , where to select a second subset comprising at least one term of the second plurality of semantically related terms based on the model and one or more properties of each term of the second plurality of semantically related terms, the active learning module is further operative to extract one or more properties of a term of the second plurality of semantically related terms, to determine a predicted indication of relevance of the term based on the extracted properties and the model, and to compare the predicted indication of relevance of the term to a threshold.
13. A computer implemented system for determining a semantically related term comprising: a keyword suggestion tool operative to determine a plurality of semantically related terms based on a seed set; an active learning module in communication with the keyword suggestion tool, the active learning module operative to: receive a first plurality of semantically related terms from the keyword suggestion tool; select a first subset comprising at least one term of the first plurality of semantically related terms based on a predictive error of each term of the semantically related terms, wherein a predictive error of a term is calculated using the equation: where x is a term vector associated with a term of the first plurality of semantically related terms and X is a matrix including a term vector for each term of the first plurality of semantically related terms: receive an indication of relevance from a user of at least one term of the first subset; train a model to predict an indication of relevance of a term by the user based on the received indication of relevance of the at least one term of the first subset; receive a second plurality of semantically related terms from the keyword suggestion tool; and select a second subset comprising at least one term of the second plurality of semantically related terms based on the model and one or more properties of each term of the second plurality of semantically related terms, wherein the one or more properties of each term of the second plurality of semantically related terms includes at least prefix overlap.