code: def convert_expand_dims(node, **kwargs):
      
      name, input_nodes, attrs = get_inputs(node, kwargs)
  
      axis = int(attrs.get("axis"))
  
      node = onnx.helper.make_node(
          "Unsqueeze",
          input_nodes,
          [name],
          axes=[axis],
          name=name,
      )
      return [node]
docs: Map MXNet's expand_dims operator attributes to onnx's Unsqueeze operator
      and return the created node.