Fix slow backoff lookup
Fix slow backoff lookup

pks/cdec-dtrain-legacy,kho/mr-cdec,kho/mr-cdec,pks/cdec-dtrain-legacy,pks/cdec-dtrain-legacy,pks/cdec-dtrain-legacy,kho/mr-cdec,pks/cdec-dtrain-legacy,kho/mr-cdec,kho/mr-cdec,kho/mr-cdec,pks/cdec-dtrain-legacy