syntax = "proto3";

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

import "tensorflow/core/framework/node_def.proto";
import "tensorflow/core/framework/function.proto";
import "tensorflow/core/framework/versions.proto";

// Represents the graph of operations
message GraphDef {
  repeated NodeDef node = 1;

  // Compatibility versions of the graph.  See core/public/version.h for version
  // history.  The GraphDef version is distinct from the TensorFlow version, and
  // each release of TensorFlow will support a range of GraphDef versions.
  VersionDef versions = 4;

  // Deprecated single version field; use versions above instead.  Since all
  // GraphDef changes before "versions" was introduced were forward
  // compatible, this field is entirely ignored.
  int32 version = 3 [deprecated = true];

  // EXPERIMENTAL. DO NOT USE OR DEPEND ON THIS YET.
  //
  // "library" provides user-defined functions.
  //
  // Naming:
  //   * library.function.name are in a flat namespace.
  //     NOTE: We may need to change it to be hierarchical to support
  //     different orgs. E.g.,
  //     { "/google/nn", { ... }},
  //     { "/google/vision", { ... }}
  //     { "/org_foo/module_bar", { ... }}
  //     map<string, FunctionDefLib> named_lib;
  //   * If node[i].op is the name of one function in "library",
  //     node[i] is deemed as a function call. Otherwise, node[i].op
  //     must be a primitive operation supported by the runtime.
  //
  //
  // Function call semantics:
  //
  //   * The callee may start execution as soon as some of its inputs
  //     are ready. The caller may want to use Tuple() mechanism to
  //     ensure all inputs are ready in the same time.
  //
  //   * The consumer of return values may start executing as soon as
  //     the return values the consumer depends on are ready.  The
  //     consumer may want to use Tuple() mechanism to ensure the
  //     consumer does not start until all return values of the callee
  //     function are ready.
  FunctionDefLibrary library = 2;
};
