Method num_nodes

tensorflow/core/graph/graph.h:651–651

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

  // nodes indexed by node ids, num_node_ids() should be used as the
  // array's size.
  int num_nodes() const { return num_nodes_; }

  // The number of live nodes in the graph, excluding the Source and Sink nodes.
  int num_op_nodes() const {