Method num_edges

tensorflow/core/graph/graph.h:665–665

The number of live edges in the graph. Because edges can be removed from the graph, num_edges() is often smaller than num_edge_ids(). If one needs to create an array of edges indexed by edge ids, num_edge_ids() should be used as the array's size.

  // edges indexed by edge ids, num_edge_ids() should be used as the
  // array's size.
  int num_edges() const { return num_edges_; }

  // Serialize the nodes starting at `from_node_id` to a GraphDef.
  void ToGraphDefSubRange(GraphDef* graph_def, int from_node_id) const;