Fix defect: shuffle_batch gives ZeroDivisionError when computing capacity stat
Fix defect: shuffle_batch gives ZeroDivisionError when computing capacity stat

JingJunYin/tensorflow,JingJunYin/tensorflow,JingJunYin/tensorflow,JingJunYin/tensorflow,JingJunYin/tensorflow,JingJunYin/tensorflow,JingJunYin/tensorflow,JingJunYin/tensorflow,JingJunYin/tensorflow,JingJunYin/tensorflow