graph_->AddEdge(input_node_it->second, 0, dst_node, dst_index);
  return absl::OkStatus();
}

Status Exporter::AddEdge(Operation* inst) {
  // For tf_executor.fetch, add only its data edges. Control edges are captured
  // later.
  if (auto fetch = llvm::dyn_cast<mlir::tf_executor::FetchOp>(inst)) {
    for (auto operand_and_idx : llvm::enumerate(fetch.getOperands())) {
      Value operand = operand_and_idx.value();

            }
        }

        if (node.isRoot() || hasTransitiveIncomingEdge) {
            // Since file dependencies are not modeled as actual edges, we need to verify
            // there are edges to this node that would follow this file dependency.
            for (LocalFileDependencyMetadata fileDependency : node.getOutgoingFileEdges()) {
                int id = nextId++;

            EndpointPair.unordered(1, 1),
            EndpointPair.unordered(1, 3))
        .inOrder();
  }

  /**
   * Populates the graph with nodes and edges in a star shape with node `1` in the middle.
   *
   * <p>Note that the edges are added in a shuffled order to properly test the effect of the
   * insertion order.
   */
  private void populateTShapedGraph() {
    putEdge(2, 1);
    putEdge(1, 4);

		file  string
		nodes []*dotVertex
		edges []dotEdge
	}{
		{
			file: "empty.dot",
		},
		{
			file: "simple.dot",
			nodes: []*dotVertex{
				NewDOTVertex(alphaNode()),
				NewDOTVertex(bravoNode()),
				NewDOTVertex(charlieNode()),
				NewDOTVertex(deltaNode()),
				NewDOTVertex(foxtrotNode()),
				NewDOTVertex(golfNode()),
			},
			edges: []dotEdge{

			*em = (*em)[:len(*em)-1]
			return
		}
	}
}

// Edge contains any attributes to be represented about edges in a graph.
type Edge struct {
	Src, Dest *Node
	// The summary weight of the edge
	Weight, WeightDiv int64

	// residual edges connect nodes that were connected through a
	// separate node, which has been removed from the report.
	Residual bool

  }

  private static SuccessorsFunction<Character> createDirectedGraph(String... edges) {
    return createGraph(/* directed= */ true, edges);
  }

  private static SuccessorsFunction<Character> createUndirectedGraph(String... edges) {
    return createGraph(/* directed= */ false, edges);
  }

  /**

  }

  private static SuccessorsFunction<Character> createDirectedGraph(String... edges) {
    return createGraph(/* directed= */ true, edges);
  }

  private static SuccessorsFunction<Character> createUndirectedGraph(String... edges) {
    return createGraph(/* directed= */ false, edges);
  }

  /**

  // Check for undeclared outputs before Encapsulation, so we can give a better
  // error message.
  // TODO(phawkins): merge this with the encapsulation code to avoid the extra
  // O(n) pass over the edges.
  for (const Edge* e : (*graph)->edges()) {
    if (!e->IsControlEdge() &&
        e->src()->attrs().Find(kXlaClusterIdAttr) != nullptr &&
        e->dst()->attrs().Find(kXlaClusterIdAttr) == nullptr &&

    // ImmutableMap.Builder maintains the order of the elements as inserted, so the map will have
    // whatever ordering the network's edges do, so ImmutableSortedMap is unnecessary even if the
    // input edges are sorted.
    ImmutableMap.Builder<E, N> edgeToReferenceNode = ImmutableMap.builder();
    for (E edge : network.edges()) {
      edgeToReferenceNode.put(edge, network.incidentNodes(edge).nodeU());
    }
    return edgeToReferenceNode.buildOrThrow();

    // ImmutableMap.Builder maintains the order of the elements as inserted, so the map will have
    // whatever ordering the network's edges do, so ImmutableSortedMap is unnecessary even if the
    // input edges are sorted.
    ImmutableMap.Builder<E, N> edgeToReferenceNode = ImmutableMap.builder();
    for (E edge : network.edges()) {
      edgeToReferenceNode.put(edge, network.incidentNodes(edge).nodeU());
    }
    return edgeToReferenceNode.buildOrThrow();