message: Enhance the comment for RunDatasetOp()
diff: @@ -771,7 +771,11 @@ class DatasetOpsTestBaseV2 : public DatasetOpsTestBase {
  std::unique_ptr<TestIterator>* iterator);
  // Runs the dataset operation according to the predefined dataset params and
  - // produces outputs.
  + // produces outputs. Different from `MakeDataset()` which returns a Dataset
  + // object, `RunDatasetOp()` executes the dataset kernel based on the input
  + // DatasetParams and returns the produced outputs as a tensor vector. It can
  + // be used to run some dataset operations that do not have an internal
  + // customized `Dataset` class (e.g. `ReduceDatasetOp`).
  Status RunDatasetOp(const DatasetParams& dataset_params,
  std::vector<Tensor>* outputs);
  