caffe message学习之Datum

github源码传送门，

message Datum {  optional int32 channels = 1;  optional int32 height = 2;  optional int32 width = 3;  // the actual image data, in bytes  optional bytes data = 4;  optional int32 label = 5;  // Optionally, the datum could also hold float data.  repeated float float_data = 6;  // If true data contains an encoded image that need to be decoded  optional bool encoded = 7 [default = false];}