check the user env variable before setting INPUT_BATCH_SIZE
check the user env variable before setting INPUT_BATCH_SIZE

zifeishan/deepdive,HazyResearch/deepdive,shahin/deepdive,zifeishan/deepdive,zifeishan/deepdive,HazyResearch/deepdive,shahin/deepdive,sky-xu/deepdive,HazyResearch/deepdive,sky-xu/deepdive,HazyResearch/deepdive,zifeishan/deepdive,zifeishan/deepdive