code: def test_generate_input_desc():
      desc0 = ops._generate_input_desc([("edge", 0)], [], [])
      desc1 = ops._generate_input_desc(
          [("edge", 0), ("edge", 1), ("edge", 2)], [], []
      )
      assert_equal("&0", desc0)
      assert_equal("&0 &1 &2", desc1)
  
      desc2 = ops._generate_input_desc(
          [("integer", 1), ("integer", 0), ("edge", 0)],
          [Constant(42).uint8(), 42],
          [],
      )
      assert_equal("$1:int32 $0:uint8 &0", desc2)
  
      c = Constant(42)
      desc3 = ops._generate_input_desc(
          [
              ("integer", 0),
              ("integer", 1),
              ("integer", 2),
              ("integer", 3),
              ("integer", 4),
              ("integer", 5),
              ("integer", 6),
              ("integer", 7),
              ("integer", 8),
          ],
          [
              int(),
              c.uint8(),
              c.uint16(),
              c.uint32(),
              c.uint64(),
              c.int8(),
              c.int16(),
              c.int32(),
              c.int64(),
          ],
          [],
      )
      assert_equal(
          "$0:int32 $1:uint8 $2:uint16 $3:uint32 $4:uint64 $5:int8 $6:int16 $7:int32 $8:int64",
          desc3,
      )
  
      desc4 = ops._generate_input_desc(
          [("real", 0), ("real", 1), ("real", 2), ("real", 3)],
          [],
          [float(), c.float16(), c.float32(), c.float64()],
      )
      assert_equal("$0:float32 $1:float16 $2:float32 $3:float64", desc4)
  
imports: import nvidia.dali.ops
  from nvidia.dali.types import Constant
  import numpy
  from nose.tools import assert_equal
  from nose_utils import assert_raises
label_desc: Use image node_id 2 for calling a global function with example usage: test_generate_input_desc() without return types