code: def test_get_contraction_structure_complex():
      x = IndexedBase("x")
      y = IndexedBase("y")
      A = IndexedBase("A")
      i, j, k = Idx("i"), Idx("j"), Idx("k")
      expr1 = y[i] + A[i, j] * x[j]
      d1 = {None: {y[i]}, (j,): {A[i, j] * x[j]}}
      assert get_contraction_structure(expr1) == d1
      expr2 = expr1 * A[k, i] + x[k]
      d2 = {
          None: {x[k]},
          (i,): {expr1 * A[k, i]},
          expr1 * A[k, i]: [d1],
      }
      assert get_contraction_structure(expr2) == d2
  
imports: from sympy.core import symbols, S, Pow, Function
  from sympy.functions import exp
  from sympy.testing.pytest import raises
  from sympy.tensor.indexed import Idx, IndexedBase
  from sympy.tensor.index_methods import IndexConformanceException
  from sympy.tensor.index_methods import get_contraction_structure, get_indices
label_desc: Use image node_id 10 for calling a global function with example usage: test_get_contraction_structure_complex() without return types