Merge remote-tracking branch 'origin/yw.1.2.fixbug' into yw.1.2

pansen

2019-02-28 fd6b130ed52e1412ccb1ff8bf7891a90a6f96d31

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