typedef struct TF_AttrMetadata {
  // A boolean: 1 if the attribute value is a list, 0 otherwise.
  unsigned char is_list;

  // Length of the list if is_list is true. Undefined otherwise.
  int64_t list_size;

  // Type of elements of the list if is_list != 0.
  // Type of the single value stored in the attribute if is_list == 0.
  TF_AttrType type;

TF_CAPI_EXPORT extern const char* TF_GetNumberAttrForOpListInput(
    const char* op_name, int input_index, TF_Status* status);

// Returns 1 if the op is stateful, 0 otherwise. The return value is undefined
// if the status is not ok.
TF_CAPI_EXPORT extern int TF_OpIsStateful(const char* op_type,
                                          TF_Status* status);

                       TF_Status* status);

  /// Returns the size of the file given by `path`.
  ///
  /// If `status` is not `TF_OK`, return value is undefined. Otherwise, returns
  /// the same as `length` member of a `TF_FileStatistics` that would be used on
  /// the equivalent call of `stat`.
  ///
  /// Plugins:
  ///   * Must set `status` to `TF_OK` if `path` exists.