Update alexnet.yaml example to match alexnet.py
Update alexnet.yaml example to match alexnet.py

NervanaSystems/neon,Bam4d/neon,nhynes/neon,NervanaSystems/neon,Bam4d/neon,NervanaSystems/neon,dongjoon-hyun/neon,Bam4d/neon,Jokeren/neon,coufon/neon-distributed,DougFirErickson/neon,coufon/neon-distributed,DougFirErickson/neon,DougFirErickson/neon,NervanaSystems/neon,nhynes/neon,coufon/neon-distributed,Jokeren/neon,nhynes/neon,Jokeren/neon,dongjoon-hyun/neon,dongjoon-hyun/neon,Jokeren/neon