18. The method of claim 16 , wherein training the first MLA classifier further comprises: analyzing the confidence parameter for a document type, and in response to the confidence parameter being above a first pre-determined threshold and a difference between the confidence parameter and a next-document-type confidence parameter being above a second pre-determined threshold, determining that the document type is one of confidently predictable document types by the first MLA classifier.
18. The method of claim 16 , wherein training the first MLA classifier further comprises: analyzing the confidence parameter for a document type, and in response to the confidence parameter being above a first pre-determined threshold and a difference between the confidence parameter and a next-document-type confidence parameter being above a second pre-determined threshold, determining that the document type is one of confidently predictable document types by the first MLA classifier. 19. The method of claim 18 , wherein training the first MLA classifier further comprises: based on comparing document types produced by the first MLA classifier for a validation set of documents with labels associated with the validation set of documents: responsive to determining that precision and recall parameters for a document of the validation set exceed corresponding threshold values of precision and recall parameters, associating a type of the document with confidently predictable document types by the first MLA classifier.