message: Track initializer in StaticVocabularyTable
diff: @@ -1118,6 +1118,8 @@ class StaticVocabularyTable(LookupInterface):
  if initializer.value_dtype != dtypes.int64:
  raise TypeError("Invalid value dtype, expected %s but got %s." %
  (dtypes.int64, initializer.value_dtype))
  + if isinstance(initializer, trackable_base.Trackable):
  + self._initializer = self._track_trackable(initializer, "_initializer")
  self._table = HashTable(initializer, default_value=-1)
  name = name or self._table.name
  else:
  