1. protoc编译proto文件时找不到文件
具体描述：在cmd中执行protoc ./object_detection/protos/*.proto --python_out=.
结果显示找不到protoc文件，查了一下好像是protoc3.5版本会有这个问题，单个文件依次生成就可以了。
命令列在下面可以直接复制
protoc ./object_detection/protos/anchor_generator.proto --python_out=.
protoc ./object_detection/protos/argmax_matcher.proto --python_out=.
protoc ./object_detection/protos/bipartite_matcher.proto --python_out=.
protoc ./object_detection/protos/box_coder.proto --python_out=.
protoc ./object_detection/protos/box_predictor.proto --python_out=.
protoc ./object_detection/protos/eval.proto --python_out=.
protoc ./object_detection/protos/faster_rcnn.proto --python_out=.
protoc ./object_detection/protos/faster_rcnn_box_coder.proto --python_out=.
protoc ./object_detection/protos/grid_anchor_generator.proto --python_out=.
protoc ./object_detection/protos/hyperparams.proto --python_out=.
protoc ./object_detection/protos/image_resizer.proto --python_out=.
protoc ./object_detection/protos/input_reader.proto --python_out=.
protoc ./object_detection/protos/keypoint_box_coder.proto --python_out=.
protoc ./object_detection/protos/losses.proto --python_out=.
protoc ./object_detection/protos/matcher.proto --python_out=.
protoc ./object_detection/protos/mean_stddev_box_coder.proto --python_out=.
protoc ./object_detection/protos/model.proto --python_out=.
protoc ./object_detection/protos/optimizer.proto --python_out=.
protoc ./object_detection/protos/pipeline.proto --python_out=.
protoc ./object_detection/protos/post_processing.proto --python_out=.
protoc ./object_detection/protos/preprocessor.proto --python_out=.
protoc ./object_detection/protos/region_similarity_calculator.proto --python_out=.
protoc ./object_detection/protos/square_box_coder.proto --python_out=.
protoc ./object_detection/protos/ssd.proto --python_out=.
protoc ./object_detection/protos/ssd_anchor_generator.proto --python_out=.
protoc ./object_detection/protos/string_int_label_map.proto --python_out=.
protoc ./object_detection/protos/train.proto --python_out=.