static Status ValidateNode(const NodeDef& node) {
  const auto node_iterator = node.attr().find("value");
  if (node_iterator != node.attr().end()) {
    AttrValue node_value = node_iterator->second;
    if (node_value.has_tensor()) {
      const PartialTensorShape node_shape(node_value.tensor().tensor_shape());
      if (node_shape.num_elements() < 0) {
        return errors::FailedPrecondition(
            "Saved model contains node \"", node.name(), "\" (op \"", node.op(),
            "\") which initializes from a tensor with ",
            node_shape.num_elements(), " elements");
      }
    }
  } else if (node.op() == "Const") {
    return errors::FailedPrecondition(
        "Saved model contains node \"", node.name(),
        "\" which is a constant tensor but no value has been provided");
  }
  return Status::OK();
}
Unknown