1. A method of determining a document type associated with a digital document, the method comprising: training, using a first training set comprising a plurality of documents of a first document type, a first machine learning algorithm (MLA) classifier of a plurality of MLA classifiers; responsive to determining that the first MLA classifier confidently identifies the first document type, excluding the first document type from a second training set; training, using the second training set, a second MLA classifier of the plurality of MLA classifiers; acquiring, via a digital document interface, a digital document; executing, by a processor, the first MLA classifier in order to determine a document type for the digital document, the first MLA classifier being associated with a first hierarchical order of execution; responsive to determining that the document type produced by the first MLA classifier is not one of confidently predictable document types associated with the first MLA classifier, executing, by the processor, the second MLA classifier in order to determine the document type for the digital document, the second MLA classifier being associated with a second hierarchical order of execution immediately following the first hierarchical order of execution.