fix python autobatch cmdline control issue
fix python autobatch cmdline control issue


Former-commit-id: 2448b64f509d2e6000f4c0dfbaa2bb508654ab89
danielhers/dynet,danielhers/dynet,xunzhang/dynet,chunyang-wen/dynet,chunyang-wen/dynet,chunyang-wen/dynet,shuheik/dynet,clab/dynet,danielhers/dynet,danielhers/dynet,xunzhang/dynet,shuheik/dynet,xunzhang/dynet,clab/dynet,xunzhang/dynet,clab/dynet,shuheik/dynet,shuheik/dynet,clab/dynet,danielhers/dynet,clab/cnn,clab/dynet,danielhers/dynet,clab/dynet,shuheik/dynet,clab/cnn,danielhers/dynet,shuheik/dynet,clab/dynet,shuheik/dynet,chunyang-wen/dynet,clab/cnn