}

Node* KnownShape(absl::Span<const int> shape,
                 const GraphDefBuilder::Options& opts) {
  return KnownShapeBase(DT_FLOAT, shape, opts);
}

Node* KeyPlaceholderShape(const GraphDefBuilder::Options& opts) {
  return KnownShapeBase(DT_STRING, {2}, opts);
}

Node* KeyPlaceholder(const string& call_node,
                     const GraphDefBuilder::Options& opts) {