code: def default_features_factories():
      """These are the default features used by the :class:`.CRFSlotFiller`
      objects"""
  
      from snips_nlu.slot_filler.crf_utils import TaggingScheme
      from snips_nlu.slot_filler.feature_factory import (
          NgramFactory,
          IsDigitFactory,
          IsFirstFactory,
          IsLastFactory,
          ShapeNgramFactory,
          CustomEntityMatchFactory,
          BuiltinEntityMatchFactory,
      )
  
      return [
          {
              "args": {
                  "common_words_gazetteer_name": None,
                  "use_stemming": False,
                  "n": 1,
              },
              "factory_name": NgramFactory.name,
              "offsets": [-2, -1, 0, 1, 2],
          },
          {
              "args": {
                  "common_words_gazetteer_name": None,
                  "use_stemming": False,
                  "n": 2,
              },
              "factory_name": NgramFactory.name,
              "offsets": [-2, 1],
          },
          {
              "args": {},
              "factory_name": IsDigitFactory.name,
              "offsets": [-1, 0, 1],
          },
          {
              "args": {},
              "factory_name": IsFirstFactory.name,
              "offsets": [-2, -1, 0],
          },
          {
              "args": {},
              "factory_name": IsLastFactory.name,
              "offsets": [0, 1, 2],
          },
          {
              "args": {"n": 1},
              "factory_name": ShapeNgramFactory.name,
              "offsets": [0],
          },
          {
              "args": {"n": 2},
              "factory_name": ShapeNgramFactory.name,
              "offsets": [-1, 0],
          },
          {
              "args": {"n": 3},
              "factory_name": ShapeNgramFactory.name,
              "offsets": [-1],
          },
          {
              "args": {
                  "use_stemming": False,
                  "tagging_scheme_code": TaggingScheme.BILOU.value,
              },
              "factory_name": CustomEntityMatchFactory.name,
              "offsets": [-2, -1, 0],
              "drop_out": 0.5,
          },
          {
              "args": {
                  "tagging_scheme_code": TaggingScheme.BIO.value,
              },
              "factory_name": BuiltinEntityMatchFactory.name,
              "offsets": [-2, -1, 0],
          },
      ]
  
label_desc: Use image node_id 1 for calling a global function with example usage: default_features_factories() and returns: list