DATA PROCESSING DEVICE AND DATA PROCESSING METHOD

A data processing device includes: a first generating unit that generates a plurality of pieces of candidate input data including a plurality of pieces of trained input data and a plurality of pieces of untrained input data; a second generating unit that generates a plurality of pieces of candidate intermediate data including trained intermediate data and untrained intermediate data; a first selection unit that selects one piece of candidate intermediate data from the plurality of pieces of candidate intermediate data, and preferentially selects one piece of candidate intermediate data having a greater degree of heterogeneity when used for second training subsequent to first training as compared with the selected intermediate data; and a second selection unit that selects one piece of candidate input data corresponding to the one piece of candidate intermediate data selected from the plurality of pieces of candidate input data to be used in the second training.