def add_graph(self, net):
self._file_writer.add_graph(_net2pb(net=net))<EOL>
Given a symbol representing the network structure of an MXNet model, write it the event
        file for visualization in TensorBoard. The parameters will be assigned with the scope
        name with the node name of the operator they belong to.

        Parameters
        ----------
            net : Symbol or HybridBlock
                An mxnet.symbol.Symbol or mxnet.gluon.HybridBlock object defining
                the structure of a network. If it's a HybridBlock, users must call hybridize()
                and forward() once before passing to this function.