message: Allow scalar input in explicit batch mode
diff: @@ -457,13 +457,12 @@ Status TRTEngineOp::VerifyInputShapes(
  }
  }
  + if (use_implicit_batch_) {
  if (input_concrete_shapes[0].dims() < 1) {
  return errors::InvalidArgument(
  "Input shapes contain scalar, for ", name(), ": ",
  TensorShapeUtils::ShapeListString(input_concrete_shapes));
  }
  -
  - if (use_implicit_batch_) {
  const int batch_size = input_concrete_shapes[0].dim_size(0);
  if (batch_size < 1) {
  return errors::InvalidArgument(
  