protos：/Users/alarih/Desktop/neuro/models-master/research/object_detection/protos
命令：
protoc -I /Users/alarih/Desktop/neuro/models-master/research/object_detection/protos/*.proto --python_out=.
You must specify a --proto_path
which encompasses this file.
Note that the proto_path must be
an exact prefix of the .proto file
names -- protoc is too dumb to
figure out when two paths
(e.g. absolute and relative)
are equivalent (it's harder than you think).