Method IsStateful

tensorflow/core/framework/dataset.h:727–727

If the dataset is stateful it will not be possible to save its graph or checkpoint the state of its iterators. TODO(jsimsa): Remove this method once all `DatasetBase` implementations are migrated over to `CheckExternalState`.

  // TODO(jsimsa): Remove this method once all `DatasetBase` implementations are
  // migrated over to `CheckExternalState`.
  virtual bool IsStateful() const { return false; }

  // Indicates whether the dataset depends on any external state. If so, the
  // method returns `errors::FailedPrecondition` with a message that identifies