Please support multiple outputs for tensorflow frontend

def AddShapesToGraphDef(session, out_node):
“”" Add shapes attribute to nodes of the graph.
Input graph here is the default graph in context.

Parameters
----------
session : tf.Session
    Tensorflow session
out_node : String
    Final output node of the graph.

Returns
-------
graph_def : Obj
    tensorflow graph definition with shapes attribute added to nodes.

"""

graph_def = tf.graph_util.convert_variables_to_constants(
    session,
    session.graph.as_graph_def(add_shapes=True),
    [out_node],                ----> out_node
    )
return graph_def

Please change the type of out_node from string to list to support multiple outputs.

Thanks for reporting.