class_docstr: This class is to extract pytorch model topology graph by tracing
code: def _trace(self, model, dummy_input):
      training = model.training
      model.eval()
      self.trace = torch.jit.trace(model, dummy_input)
      torch._C._jit_pass_inline(self.trace.graph)
      model.train(training)
  
imports: import logging
  import queue
  import re
  from collections import defaultdict
  import torch
  from torch.utils.tensorboard._pytorch_graph import NodePy, NodePyIO, NodePyOP, GraphPy
label_desc: Use image node_id 2 for calling the TorchGraph obj's underlying member method code with example usage: obj._trace(model, dummy_input) without return types