16. The computer readable medium of claim 15 , wherein the operations further comprise: testing performance of the natural language model using a subset of the documents among the training data that received annotations.
16. The computer readable medium of claim 15 , wherein the operations further comprise: testing performance of the natural language model using a subset of the documents among the training data that received annotations. 17. The computer readable medium of claim 16 , wherein the operations further comprise: computing a performance metric of the natural language model, based on results of the testing; and determining whether the natural language model satisfies at least one performance criterion based on the computed performance metric.