Merge remote-tracking branch 'origin/ywv1.2' into ywv1.2

zhangjixing

2019-01-15 fa7e820c7715eb9294c9bae62c6f75fd3bda4f0d

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aeroplane
bicycle
bird
boat
bottle
bus
car
cat
chair
cow
diningtable
dog
horse
motorbike
person
pottedplant
sheep
sofa
train
tvmonitor