Standalone C++ example: print a proto for debugging

When debugging model parsing or graph transformations, it can be helpful to dump any ONNX proto as readable text. Each generated proto class exposes PrintToVectorString for this purpose.

#include "onnx.h"
#include "simple_string.h"

#include <iostream>
#include <vector>

int main() {
  onnx::NodeProto node;
  node.set_name("relu1");
  node.set_op_type("Relu");
  *node.add_input() = "X";
  *node.add_output() = "Y";
  node.set_doc_string("Simple ReLU activation");

  onnx::utils::PrintOptions options;
  std::vector<std::string> lines = node.PrintToVectorString(options);
  // join_string is declared in simple_string.h.
  std::cout << onnx::utils::join_string(lines, "\n") << "\n";
  return 0;
}

Example output:

input: "X"
output: "Y"
name: "relu1"
op_type: "Relu"
doc_string: "Simple ReLU activation"

See also

• onnx::ProtoDebugString (from proto_utils.h) is a convenience helper that internally calls PrintToVectorString and returns a single std::string.