message: [tf.data] Map vectorization benchmark fix, to actually measure the `cast` function.
diff: @@ -159,7 +159,7 @@ class MapVectorizationBenchmark(test.Benchmark):
  def benchmarkCast(self):
  self._benchmark_helper(
  - lambda *args: [math_ops.cast(x, dtypes.float64) for x in args], "cast")
  + lambda *args: [math_ops.cast(x, dtypes.float32) for x in args], "cast")
  def benchmarkReshape(self):
  self._benchmark_helper(
  