}

  return success();
}

// static
void ParallelExecuteOp::build(OpBuilder& builder, OperationState& state,
                              int num_regions, TypeRange output_types) {
  DCHECK_GE(num_regions, 1);
  for (int i = 0; i < num_regions; ++i) {
    Region* region = state.addRegion();
    region->push_back(new Block);
  }
  state.addTypes(output_types);
}

  tensorflow::Status Shape(
      tensorflow::PartialTensorShape* shape) const override {
    DCHECK(shape != nullptr);
    TF_Status status;
    int num_dims = TF_GraphGetTensorNumDims(graph_, output_, &status);
    DCHECK_GE(num_dims, -1);
    TF_RETURN_IF_ERROR(StatusFromTF_Status(&status));
    if (num_dims == kUnknownRank) {
      return absl::OkStatus();
    }

    std::vector<int64_t> dims(num_dims, kUnknownDim);