improve cifar instructions
improve cifar instructions

rahulbhalerao001/SparkNet,amplab/SparkNet,rahulbhalerao001/SparkNet,rahulbhalerao001/SparkNet,rahulbhalerao001/SparkNet,rahulbhalerao001/SparkNet,rahulbhalerao001/SparkNet,rahulbhalerao001/SparkNet,amplab/SparkNet,amplab/SparkNet