deploy onnx with c++, how to know the predict num

[XDxiaoqi]

❔Question

deploy onnx with c++, how to know the predict num, can know with python

Additional context

1. the python can print the out shape
   session = onnxruntime.InferenceSession(model_path, None)
   input_name = session.get_inputs()[0].name #"images"
   output = session.run(['detections'], {input_name: input}) #out_name:"detections"
   print("output shape is: ", output[0].shape) #can know the shape: (4, 57)

2. the c++ how to know the shape
   size_t input_count = 1;
   ort_outputs_.clear();
   ort_outputs_ = ort_session_->Run(Ort::RunOptions{ nullptr },
   input_names_.data(), &input_tensor, input_count,
   output_names_.data(), output_names_.size());
   LOG(INFO)<<"line infer ort outputs size: "<<ort_outputs_.size();

   //score_map is 57 or 572 or or 573?
   float *score_map = ort_outputs_[0].GetTensorMutableData();