code: def test_dropout_attributes():
      x = C.input_variable((1, 5, 5))
      f = C.dropout(x, 0.5, 42)
      d = f.root_function.attributes
      expected = {"dropoutRate": 0.5, "rngSeed": 42, "rngOffset": 0}
      _check(expected, d)
  
imports: import cntk
  import numpy
label_desc: Use image node_id 4 for calling a global function with example usage: test_dropout_attributes() without return types