Patent Document ID: 9715656
Application ID: 15262582
Patent Status: 1

Claim One:
1. A resistive processing unit (RPU) array comprising: a set of conductive row wires; a set of conductive column wires configured to form a plurality of crosspoints at intersections between the set of conductive row wires and the set of conductive column wires; and a plurality of two-terminal RPUs, wherein a two-terminal RPU is located at each of the plurality of crosspoints, wherein a conduction state of an RPU identifies a weight of a training methodology applied to said RPU; and wherein, the RPU array unit is configured to receive one or more electric signals that burn a selected subset of RPUs from the plurality of the RPUs, the selected subset of RPUs being selected based on corresponding asymmetry values being above a predetermined asymmetry threshold, and wherein the asymmetry value of an RPU from the plurality of RPUs is measured by: measuring a first change in the conduction state of the RPU caused by a positive pulse; measuring a second change in the conduction state of the RPU caused by a negative pulse; and determining the asymmetry value of the RPU as a difference between the first change and the second change.