code: def __init__(self, callbackTable=None):
      if callbackTable is None:
          callbackTable = {}
      self._callbackTable = callbackTable
  
file_path: catboost/contrib/python/fonttools/fontTools/colorLib/table_builder.py
imports: import collections
  import enum
  from fontTools.ttLib.tables.otBase import BaseTable, FormatSwitchingBaseTable, UInt8FormatSwitchingBaseTable
  from fontTools.ttLib.tables.otConverters import ComputedInt, SimpleValue, Struct, Short, UInt8, UShort, IntValue, FloatValue, OptionalValue
  from fontTools.misc.roundTools import otRound
label_desc: Use image node_id 1 to create a new TableUnbuilder object  with example: obj = TableUnbuilder(callbackTable)