syntax = "proto3";

package tensorflow;
option cc_enable_arenas = true;
option java_outer_classname = "CostGraphProtos";
option java_multiple_files = true;
option java_package = "org.tensorflow.framework";

message CostGraphDef {
  message Node {
    // The name of the node. Names are globally unique.
    string name = 1;

    // The device of the node. Can be empty if the node is mapped to the
    // default partition or partitioning hasn't been run yet.
    string device = 2;

    // The id of the node. Node ids are only unique inside a partition.
    int32 id = 3;

    // Inputs of this node. They must be executed before this node can be
    // executed. An input is a particular output of another node, specified
    // by the node id and the output index.
    message InputInfo {
      int32 preceding_node = 1;
      int32 preceding_port = 2;
    }
    repeated InputInfo input_info = 4;

    // Outputs of this node.
    message OutputInfo {
      int64 size = 1;
      // If >= 0, the output is an alias of an input. Note that an alias input
      // may itself be an alias. The algorithm will therefore need to follow
      // those pointers.
      int64 alias_input_port = 2;
    }
    repeated OutputInfo output_info = 5;

    // Temporary memory used by this node.
    int64 temporary_memory_size = 6;

    // Estimate of the computational cost of this node.
    int64 compute_cost = 9;

    // If true, the output is permanent: it can't be discarded, because this
    // node is part of the "final output". Nodes may depend on final nodes.
    bool is_final = 7;

    // Ids of the control inputs for this node.
    repeated int32 control_input = 8;
  }
  repeated Node node = 1;
}
