message: Always use std::cerr
diff: @@ -13,6 +13,7 @@ See the License for the specific language governing permissions and
  limitations under the License.
  ==============================================================================*/
  +#include <iostream>
  #include "tensorflow/core/framework/op_kernel.h"
  #include "tensorflow/core/lib/core/status.h"
  #include "tensorflow/core/lib/strings/str_util.h"
  @@ -76,7 +77,7 @@ class PrintOp : public OpKernel {
  strings::StrAppend(&msg, "[", ctx->input(i).SummarizeValue(summarize_),
  "]");
  }
  - LOG(INFO) << msg;
  + std::cerr << msg << std::endl;
  }
  private:
  