std::unordered_map<string, Node*>* node_name_map);

  // Prune nodes that do not feed into fetch nodes.
  Status PruneUnreachableNodes(
      std::unordered_map<string, Node*>* node_name_map);

  // Converts feeds to Placeholder nodes.
  Status ConvertFeedsToPlaceholders(
      std::unordered_map<string, Node*>* node_name_map);

  // Converts the inferred shape referred to by 'handle' in 'context', with

    op. The order of ops will be preserved. Functions named `main` with no
    `tf.entry_function` attribute will not be pruned, as such graphs/functions may
    have been imported from a V1 TensorFlow graph, where feeds/fetches/targets are
    not provided at certain stages of IR transformation (e.g. pre-placement).

    Option `ops-to-preserve` allows to specify ops that should not be pruned,
    regardless of their reachability.