docstr: Forward torch model to infer output shape
docstr_tok: ["Forward","torch","model","to","infer","output","shape"]
code: def _infer_torch_output_shapes(torch_model, input_shapes):
      """
      Forward torch model to infer output shape
      """
      return TorchGraph._forward_torch_random_input(
          torch_model, input_shapes, is_batch=False
      )
  
file_path: MMdnn/mmdnn/conversion/torch/torch_graph.py
imports: from mmdnn.conversion.common.DataStructure.graph import GraphNode, Graph
  from tensorflow.core.framework.node_def_pb2 import NodeDef
  from tensorflow.core.framework import attr_value_pb2
  import torch
label_desc: Use image node_id 3 for calling the TorchGraph obj's underlying member method code with example usage: obj._infer_torch_output_shapes(torch_model, input_shapes) and returns: TorchGraph