code: def test_multiple_generators(self):
      def f(l):
          s = [
              e * e for sublist in l for e in sublist
          ]  # pylint:disable=g-complex-comprehension
          return s
  
      self.assertTransformedEquivalent(f, [])
      self.assertTransformedEquivalent(f, [[1], [2], [3]])
  
imports: from nvidia.dali._autograph.converters import list_comprehensions
  from nvidia.dali._autograph.core import converter_testing
label_desc: Use image node_id 3 for calling the ListCompTest obj's underlying member method code with example usage: obj.test_multiple_generators() and returns: s