Crash in NMS ops caused by integer conversion to unsigned

Impact An attacker can cause denial of service in applications serving models using tf.rawops.NonMaxSuppressionV5 by triggering a division by 0: python import tensorflow as tf tf.rawops.NonMaxSuppressionV5 boxes=0.1,0.1,0.1,0.1,0.2,0.2,0.2,0.2,0.3,0.3,0.3,0.3, scores=1.0,2.0,3.0, maxoutputsize=-1...