*/
  Graph<N> asGraph();

  //
  // Network properties
  //

  /**
   * Returns true if the edges in this network are directed. Directed edges connect a {@link
   * EndpointPair#source() source node} to a {@link EndpointPair#target() target node}, while
   * undirected edges connect a pair of nodes to each other.
   */
  boolean isDirected();

 */
public enum WitnessEventType {
    /**
     * Resource state changed - general resource state modification
     */
    RESOURCE_CHANGE(1),

    /**
     * Client should move to different node - directed failover
     */
    CLIENT_MOVE(2),

    /**
     * Share moved to different node - share mobility event
     */
    SHARE_MOVE(3),

    /**
     * IP address changed - network configuration change

    // will have no isolated nodes, we can skip adding nodes explicitly and let putEdge() do it.

    if (graph.isDirected()) {
      // Note: works for both directed and undirected graphs, but we only use in the directed case.
      for (N node : graph.nodes()) {
        for (N reachableNode : reachableNodes(graph, node)) {
          transitiveClosure.putEdge(node, reachableNode);
        }
      }

    // will have no isolated nodes, we can skip adding nodes explicitly and let putEdge() do it.

    if (graph.isDirected()) {
      // Note: works for both directed and undirected graphs, but we only use in the directed case.
      for (N node : graph.nodes()) {
        for (N reachableNode : reachableNodes(graph, node)) {
          transitiveClosure.putEdge(node, reachableNode);
        }
      }

        endpoints for `tf.keras` stay unchanged, but are now backed by the
        `keras` PIP package. All Keras-related PRs and issues should now be
        directed to the GitHub repository.
        [keras-team/keras](http://github.com/keras-team/keras).
    *   `tf.keras.utils.experimental.DatasetCreator` now takes an optional