code: def network_structure_7():
      # in this graph, the subgraph node and the other two external nodes form a cycle
      data = mx.sym.Variable("data", shape=(1,))
      ret1 = mx.sym.sin(data)
      ret2 = mx.sym.cos(ret1)
      for _ in range(5):
          ret2 = mx.sym.cos(ret2)
      ret = ret1 + ret2
      return (ret, ["data"], [(1,)])
  
imports: import os
  import sys
  import ctypes
  import mxnet
  from mxnet.base import SymbolHandle, check_call, _LIB, mx_uint, c_str_array, c_str, mx_real_t
  from mxnet.symbol import Symbol
  import numpy
  from mxnet.test_utils import assert_almost_equal, environment
  from mxnet import gluon
  from mxnet.gluon import nn
  from mxnet import nd, npx
  import pytest
  import tempfile
label_desc: Use image node_id 7 for calling a global function with example usage: network_structure_7() and returns: ret,  list,  list