fix decoding bug
fix decoding bug

nke001/attention-lvcsr,rizar/attention-lvcsr,nke001/attention-lvcsr,rizar/attention-lvcsr,rizar/attention-lvcsr,nke001/attention-lvcsr,rizar/attention-lvcsr,nke001/attention-lvcsr,rizar/attention-lvcsr,nke001/attention-lvcsr