Function Canonicalize

tensorflow/core/framework/function.h:791–793

string Canonicalize(const string& funcname, AttrSlice attrs,
                    const FunctionLibraryRuntime::InstantiateOptions& options);
inline string Canonicalize(const string& funcname, AttrSlice attrs) {
  return Canonicalize(funcname, attrs, {});
}

const FunctionLibraryRuntime::Handle kInvalidHandle = -1;
const FunctionLibraryRuntime::LocalHandle kInvalidLocalHandle = -1;