Use CAFFE training

[jiaomiaomiao]

when I train always output:
Train net output #310247: data_weight = 13
I0614 17:53:33.449663 27190 solver.cpp:245] Train net output #310248: data_weight = -8
I0614 17:53:33.449671 27190 solver.cpp:245] Train net output #310249: data_weight = 4
I0614 17:53:33.449678 27190 solver.cpp:245] Train net output #310250: data_weight = -27
I0614 17:53:33.449687 27190 solver.cpp:245] Train net output #310251: data_weight = -66
I0614 17:53:33.449693 27190 solver.cpp:245] Train net output #310252: data_weight = -24
I0614 17:53:33.449702 27190 solver.cpp:245] Train net output #310253: data_weight = 7
I0614 17:53:33.449709 27190 solver.cpp:245] Train net output #310254: data_weight = 0
I0614 17:53:33.449717 27190 solver.cpp:245] Train net output #310255: data_weight = -30
I0614 17:53:33.449724 27190 solver.cpp:245] Train net output #310256: data_weight = 14
I0614 17:53:33.449733 27190 solver.cpp:245] Train net output #310257: data_weight = 1
I0614 17:53:33.449740 27190 solver.cpp:245] Train net output #310258: data_weight = -22
I0614 17:53:33.449748 27190 solver.cpp:245] Train net output #310259: data_weight = -11
I0614 17:53:33.449759 27190 solver.cpp:245] Train net output #310260: data_weight = -5
I0614 17:53:33.449767 27190 solver.cpp:245] Train net output #310261: data_weight = -1
I0614 17:53:33.449775 27190 solver.cpp:245] Train net output #310262: data_weight = 17
I0614 17:53:33.449782 27190 solver.cpp:245] Train net output #310263: data_weight = 24
I0614 17:53:33.450911 27190 solver.cpp:245] Train net output #310264: data_weight = -8
I0614 17:53:33.450917 27190 solver.cpp:245] Train net output #310265: data_weight = -11
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