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def default_features_factories():
"""These are the default features used by the :class:`.CRFSlotFiller`
objects"""
from snips_inference_agl.slot_filler.crf_utils import TaggingScheme
from snips_inference_agl.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]
},
]
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