By torchscript tracing(I see this in torch.onnx.utils.py, in _trace_and_get_graph_from_model() function), I can get an object instance of torch._C.Graph, but how can know the data members  and available member functions of class torch._C.Graph?
If the instance name of torch._C.Graph  is graph, by calling list(graph.inputs()) (just as shown in torch/onnx/utils.py), we can get a list of torch._C.Value, so, how can I know  the data members  and available member functions of torch._C.Value?
I think there should be some cpp codes for torch._C.Graph and torch._C.Value,  but I am not sure which class  is corresponding to torch._C.Value.
For example, there is struct Graph defined in caffe2/core/graph.h, third_party/onnx/onnx/common/ir.h, torch/csrc/jit/ir/ir.h, I don’t know which file defineds torch._C.Graph.