diff --git a/snips_nlu/default_configs/config_de.py b/snips_nlu/default_configs/config_de.py
index 1a53e2c55..1644a9163 100644
--- a/snips_nlu/default_configs/config_de.py
+++ b/snips_nlu/default_configs/config_de.py
@@ -22,13 +22,7 @@
                             "n": 1
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [-2, -1, 0, 1, 2]
                     },
                     {
                         "args": {
@@ -38,101 +32,59 @@
                             "n": 2
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            1
-                        ]
+                        "offsets": [-2, 1]
                     },
                     {
                         "args": {
                             "prefix_size": 2
                         },
                         "factory_name": "prefix",
-                        "offsets": [
-                            0
-                        ]
+                        "offsets": [0]
                     },
                     {
-                        "args": {
-                            "prefix_size": 5
-                        },
+                        "args": {"prefix_size": 5},
                         "factory_name": "prefix",
-                        "offsets": [
-                            0
-                        ]
+                        "offsets": [0]
                     },
                     {
-                        "args": {
-                            "suffix_size": 2
-                        },
+                        "args": {"suffix_size": 2},
                         "factory_name": "suffix",
-                        "offsets": [
-                            0
-                        ]
+                        "offsets": [0]
                     },
                     {
-                        "args": {
-                            "suffix_size": 5
-                        },
+                        "args": {"suffix_size": 5},
                         "factory_name": "suffix",
-                        "offsets": [
-                            0
-                        ]
+                        "offsets": [0]
                     },
                     {
                         "args": {},
                         "factory_name": "is_digit",
-                        "offsets": [
-                            -1,
-                            0,
-                            1
-                        ]
+                        "offsets": [-1, 0, 1]
                     },
                     {
                         "args": {},
                         "factory_name": "is_first",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ]
+                        "offsets": [-2, -1, 0]
                     },
                     {
                         "args": {},
                         "factory_name": "is_last",
-                        "offsets": [
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [0, 1, 2]
                     },
                     {
-                        "args": {
-                            "n": 1
-                        },
+                        "args": {"n": 1},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            0
-                        ]
+                        "offsets": [0]
                     },
                     {
-                        "args": {
-                            "n": 2
-                        },
+                        "args": {"n": 2},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1,
-                            0
-                        ]
+                        "offsets": [-1, 0]
                     },
                     {
-                        "args": {
-                            "n": 3
-                        },
+                        "args": {"n": 3},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1
-                        ]
+                        "offsets": [-1]
                     },
                     {
                         "args": {
@@ -140,23 +92,13 @@
                             "tagging_scheme_code": 2
                         },
                         "factory_name": "entity_match",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ],
+                        "offsets": [-2, -1, 0],
                         "drop_out": 0.5
                     },
                     {
-                        "args": {
-                            "tagging_scheme_code": 1
-                        },
+                        "args": {"tagging_scheme_code": 1},
                         "factory_name": "builtin_entity_match",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ]
+                        "offsets": [-2, -1, 0]
                     }
                 ],
                 "crf_args": {
diff --git a/snips_nlu/default_configs/config_en.py b/snips_nlu/default_configs/config_en.py
index b5034bc15..ac6a66d1e 100644
--- a/snips_nlu/default_configs/config_en.py
+++ b/snips_nlu/default_configs/config_en.py
@@ -22,13 +22,7 @@
                             "n": 1
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [-2, -1, 0, 1, 2]
                     },
                     {
                         "args": {
@@ -38,65 +32,37 @@
                             "n": 2
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            1
-                        ]
+                        "offsets": [-2, 1]
                     },
                     {
                         "args": {},
                         "factory_name": "is_digit",
-                        "offsets": [
-                            -1,
-                            0,
-                            1
-                        ]
+                        "offsets": [-1, 0, 1]
                     },
                     {
                         "args": {},
                         "factory_name": "is_first",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ]
+                        "offsets": [-2, -1, 0]
                     },
                     {
                         "args": {},
                         "factory_name": "is_last",
-                        "offsets": [
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [0, 1, 2]
                     },
                     {
-                        "args": {
-                            "n": 1
-                        },
+                        "args": {"n": 1},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            0
-                        ]
+                        "offsets": [0]
                     },
                     {
-                        "args": {
-                            "n": 2
-                        },
+                        "args": {"n": 2},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1,
-                            0
-                        ]
+                        "offsets": [-1, 0]
                     },
                     {
-                        "args": {
-                            "n": 3
-                        },
+                        "args": {"n": 3},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1
-                        ]
+                        "offsets": [-1]
                     },
                     {
                         "args": {
@@ -104,23 +70,13 @@
                             "tagging_scheme_code": 2
                         },
                         "factory_name": "entity_match",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ],
+                        "offsets": [-2, -1, 0],
                         "drop_out": 0.5
                     },
                     {
-                        "args": {
-                            "tagging_scheme_code": 1
-                        },
+                        "args": {"tagging_scheme_code": 1},
                         "factory_name": "builtin_entity_match",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ]
+                        "offsets": [-2, -1, 0]
                     },
                     {
                         "args": {
@@ -128,12 +84,7 @@
                             "use_stemming": False
                         },
                         "factory_name": "word_cluster",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0,
-                            1
-                        ]
+                        "offsets": [-2, -1, 0, 1]
                     }
                 ],
                 "crf_args": {
diff --git a/snips_nlu/default_configs/config_es.py b/snips_nlu/default_configs/config_es.py
index e835f94f4..df9c25f15 100644
--- a/snips_nlu/default_configs/config_es.py
+++ b/snips_nlu/default_configs/config_es.py
@@ -22,13 +22,7 @@
                             "n": 1
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [-2, -1, 0, 1, 2]
                     },
                     {
                         "args": {
@@ -38,65 +32,37 @@
                             "n": 2
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            1
-                        ]
+                        "offsets": [-2, 1]
                     },
                     {
                         "args": {},
                         "factory_name": "is_digit",
-                        "offsets": [
-                            -1,
-                            0,
-                            1
-                        ]
+                        "offsets": [-1, 0, 1]
                     },
                     {
                         "args": {},
                         "factory_name": "is_first",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ]
+                        "offsets": [-2, -1, 0]
                     },
                     {
                         "args": {},
                         "factory_name": "is_last",
-                        "offsets": [
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [0, 1, 2]
                     },
                     {
-                        "args": {
-                            "n": 1
-                        },
+                        "args": {"n": 1},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            0
-                        ]
+                        "offsets": [0]
                     },
                     {
-                        "args": {
-                            "n": 2
-                        },
+                        "args": {"n": 2},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1,
-                            0
-                        ]
+                        "offsets": [-1, 0]
                     },
                     {
-                        "args": {
-                            "n": 3
-                        },
+                        "args": {"n": 3},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1
-                        ]
+                        "offsets": [-1]
                     },
                     {
                         "args": {
@@ -104,23 +70,13 @@
                             "tagging_scheme_code": 2
                         },
                         "factory_name": "entity_match",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ],
+                        "offsets": [-2, -1, 0],
                         "drop_out": 0.5
                     },
                     {
-                        "args": {
-                            "tagging_scheme_code": 1
-                        },
+                        "args": {"tagging_scheme_code": 1},
                         "factory_name": "builtin_entity_match",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ]
+                        "offsets": [-2, -1, 0]
                     }
                 ],
                 "crf_args": {
diff --git a/snips_nlu/default_configs/config_fr.py b/snips_nlu/default_configs/config_fr.py
index e835f94f4..df9c25f15 100644
--- a/snips_nlu/default_configs/config_fr.py
+++ b/snips_nlu/default_configs/config_fr.py
@@ -22,13 +22,7 @@
                             "n": 1
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [-2, -1, 0, 1, 2]
                     },
                     {
                         "args": {
@@ -38,65 +32,37 @@
                             "n": 2
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            1
-                        ]
+                        "offsets": [-2, 1]
                     },
                     {
                         "args": {},
                         "factory_name": "is_digit",
-                        "offsets": [
-                            -1,
-                            0,
-                            1
-                        ]
+                        "offsets": [-1, 0, 1]
                     },
                     {
                         "args": {},
                         "factory_name": "is_first",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ]
+                        "offsets": [-2, -1, 0]
                     },
                     {
                         "args": {},
                         "factory_name": "is_last",
-                        "offsets": [
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [0, 1, 2]
                     },
                     {
-                        "args": {
-                            "n": 1
-                        },
+                        "args": {"n": 1},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            0
-                        ]
+                        "offsets": [0]
                     },
                     {
-                        "args": {
-                            "n": 2
-                        },
+                        "args": {"n": 2},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1,
-                            0
-                        ]
+                        "offsets": [-1, 0]
                     },
                     {
-                        "args": {
-                            "n": 3
-                        },
+                        "args": {"n": 3},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1
-                        ]
+                        "offsets": [-1]
                     },
                     {
                         "args": {
@@ -104,23 +70,13 @@
                             "tagging_scheme_code": 2
                         },
                         "factory_name": "entity_match",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ],
+                        "offsets": [-2, -1, 0],
                         "drop_out": 0.5
                     },
                     {
-                        "args": {
-                            "tagging_scheme_code": 1
-                        },
+                        "args": {"tagging_scheme_code": 1},
                         "factory_name": "builtin_entity_match",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ]
+                        "offsets": [-2, -1, 0]
                     }
                 ],
                 "crf_args": {
diff --git a/snips_nlu/default_configs/config_it.py b/snips_nlu/default_configs/config_it.py
index e835f94f4..df9c25f15 100644
--- a/snips_nlu/default_configs/config_it.py
+++ b/snips_nlu/default_configs/config_it.py
@@ -22,13 +22,7 @@
                             "n": 1
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [-2, -1, 0, 1, 2]
                     },
                     {
                         "args": {
@@ -38,65 +32,37 @@
                             "n": 2
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            1
-                        ]
+                        "offsets": [-2, 1]
                     },
                     {
                         "args": {},
                         "factory_name": "is_digit",
-                        "offsets": [
-                            -1,
-                            0,
-                            1
-                        ]
+                        "offsets": [-1, 0, 1]
                     },
                     {
                         "args": {},
                         "factory_name": "is_first",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ]
+                        "offsets": [-2, -1, 0]
                     },
                     {
                         "args": {},
                         "factory_name": "is_last",
-                        "offsets": [
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [0, 1, 2]
                     },
                     {
-                        "args": {
-                            "n": 1
-                        },
+                        "args": {"n": 1},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            0
-                        ]
+                        "offsets": [0]
                     },
                     {
-                        "args": {
-                            "n": 2
-                        },
+                        "args": {"n": 2},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1,
-                            0
-                        ]
+                        "offsets": [-1, 0]
                     },
                     {
-                        "args": {
-                            "n": 3
-                        },
+                        "args": {"n": 3},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1
-                        ]
+                        "offsets": [-1]
                     },
                     {
                         "args": {
@@ -104,23 +70,13 @@
                             "tagging_scheme_code": 2
                         },
                         "factory_name": "entity_match",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ],
+                        "offsets": [-2, -1, 0],
                         "drop_out": 0.5
                     },
                     {
-                        "args": {
-                            "tagging_scheme_code": 1
-                        },
+                        "args": {"tagging_scheme_code": 1},
                         "factory_name": "builtin_entity_match",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ]
+                        "offsets": [-2, -1, 0]
                     }
                 ],
                 "crf_args": {
diff --git a/snips_nlu/default_configs/config_ja.py b/snips_nlu/default_configs/config_ja.py
index bd1c9f14c..f1cbf202f 100644
--- a/snips_nlu/default_configs/config_ja.py
+++ b/snips_nlu/default_configs/config_ja.py
@@ -21,13 +21,7 @@
                             "n": 1
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [-2, -1, 0, 1, 2]
                     },
                     {
                         "args": {
@@ -36,107 +30,57 @@
                             "n": 2
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [-2, 0, 1, 2]
                     },
                     {
-                        "args": {
-                            "prefix_size": 1
-                        },
+                        "args": {"prefix_size": 1},
                         "factory_name": "prefix",
-                        "offsets": [
-                            0,
-                            1
-                        ]
+                        "offsets": [0, 1]
                     },
                     {
-                        "args": {
-                            "prefix_size": 2
-                        },
+                        "args": {"prefix_size": 2},
                         "factory_name": "prefix",
-                        "offsets": [
-                            0,
-                            1
-                        ]
+                        "offsets": [0, 1]
                     },
                     {
-                        "args": {
-                            "suffix_size": 1
-                        },
+                        "args": {"suffix_size": 1},
                         "factory_name": "suffix",
-                        "offsets": [
-                            0,
-                            1
-                        ]
+                        "offsets": [0, 1]
                     },
                     {
-                        "args": {
-                            "suffix_size": 2
-                        },
+                        "args": {"suffix_size": 2},
                         "factory_name": "suffix",
-                        "offsets": [
-                            0,
-                            1
-                        ]
+                        "offsets": [0, 1]
                     },
                     {
                         "args": {},
                         "factory_name": "is_digit",
-                        "offsets": [
-                            -1,
-                            0,
-                            1
-                        ]
+                        "offsets": [-1, 0, 1]
                     },
                     {
                         "args": {},
                         "factory_name": "is_first",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ]
+                        "offsets": [-2, -1, 0]
                     },
                     {
                         "args": {},
                         "factory_name": "is_last",
-                        "offsets": [
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [0, 1, 2]
                     },
                     {
-                        "args": {
-                            "n": 1
-                        },
+                        "args": {"n": 1},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            0
-                        ]
+                        "offsets": [0]
                     },
                     {
-                        "args": {
-                            "n": 2
-                        },
+                        "args": {"n": 2},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1,
-                            0
-                        ]
+                        "offsets": [-1, 0]
                     },
                     {
-                        "args": {
-                            "n": 3
-                        },
+                        "args": {"n": 3},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1
-                        ]
+                        "offsets": [-1]
                     },
                     {
                         "args": {
@@ -144,25 +88,13 @@
                             "tagging_scheme_code": 2
                         },
                         "factory_name": "entity_match",
-                        "offsets": [
-                            -1,
-                            0,
-                            1,
-                            2
-                        ],
+                        "offsets": [-1, 0, 1, 2],
                         "drop_out": 0.5
                     },
                     {
-                        "args": {
-                            "tagging_scheme_code": 1
-                        },
+                        "args": {"tagging_scheme_code": 1},
                         "factory_name": "builtin_entity_match",
-                        "offsets": [
-                            -1,
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [-1, 0, 1, 2]
                     },
                     {
                         "args": {
@@ -170,13 +102,7 @@
                             "use_stemming": False
                         },
                         "factory_name": "word_cluster",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [-2, -1, 0, 1, 2]
                     }
                 ],
                 "crf_args": {
diff --git a/snips_nlu/default_configs/config_ko.py b/snips_nlu/default_configs/config_ko.py
index 8d18a3b47..fe4661c3f 100644
--- a/snips_nlu/default_configs/config_ko.py
+++ b/snips_nlu/default_configs/config_ko.py
@@ -21,13 +21,7 @@
                             "n": 1
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [-2, -1, 0, 1, 2]
                     },
                     {
                         "args": {
@@ -36,101 +30,57 @@
                             "n": 2
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            1
-                        ]
+                        "offsets": [-2, 1]
                     },
                     {
-                        "args": {
-                            "prefix_size": 1
-                        },
+                        "args": {"prefix_size": 1},
                         "factory_name": "prefix",
-                        "offsets": [
-                            0
-                        ]
+                        "offsets": [0]
                     },
                     {
-                        "args": {
-                            "prefix_size": 2
-                        },
+                        "args": {"prefix_size": 2},
                         "factory_name": "prefix",
-                        "offsets": [
-                            0
-                        ]
+                        "offsets": [0]
                     },
                     {
-                        "args": {
-                            "suffix_size": 1
-                        },
+                        "args": {"suffix_size": 1},
                         "factory_name": "suffix",
-                        "offsets": [
-                            0
-                        ]
+                        "offsets": [0]
                     },
                     {
-                        "args": {
-                            "suffix_size": 2
-                        },
+                        "args": {"suffix_size": 2},
                         "factory_name": "suffix",
-                        "offsets": [
-                            0
-                        ]
+                        "offsets": [0]
                     },
                     {
                         "args": {},
                         "factory_name": "is_digit",
-                        "offsets": [
-                            -1,
-                            0,
-                            1
-                        ]
+                        "offsets": [-1, 0, 1]
                     },
                     {
                         "args": {},
                         "factory_name": "is_first",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ]
+                        "offsets": [-2, -1, 0]
                     },
                     {
                         "args": {},
                         "factory_name": "is_last",
-                        "offsets": [
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [0, 1, 2]
                     },
                     {
-                        "args": {
-                            "n": 1
-                        },
+                        "args": {"n": 1},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            0
-                        ]
+                        "offsets": [0]
                     },
                     {
-                        "args": {
-                            "n": 2
-                        },
+                        "args": {"n": 2},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1,
-                            0
-                        ]
+                        "offsets": [-1, 0]
                     },
                     {
-                        "args": {
-                            "n": 3
-                        },
+                        "args": {"n": 3},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1
-                        ]
+                        "offsets": [-1]
                     },
                     {
                         "args": {
@@ -138,23 +88,13 @@
                             "tagging_scheme_code": 2
                         },
                         "factory_name": "entity_match",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ],
+                        "offsets": [-2, -1, 0],
                         "drop_out": 0.5
                     },
                     {
-                        "args": {
-                            "tagging_scheme_code": 1
-                        },
+                        "args": {"tagging_scheme_code": 1},
                         "factory_name": "builtin_entity_match",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ]
+                        "offsets": [-2, -1, 0]
                     }
                 ],
                 "crf_args": {
diff --git a/snips_nlu/default_configs/config_pt_br.py b/snips_nlu/default_configs/config_pt_br.py
index e8a478b5b..f831cd59d 100644
--- a/snips_nlu/default_configs/config_pt_br.py
+++ b/snips_nlu/default_configs/config_pt_br.py
@@ -22,13 +22,7 @@
                             "n": 1
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [-2, -1, 0, 1, 2]
                     },
                     {
                         "args": {
@@ -38,65 +32,37 @@
                             "n": 2
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            1
-                        ]
+                        "offsets": [-2, 1]
                     },
                     {
                         "args": {},
                         "factory_name": "is_digit",
-                        "offsets": [
-                            -1,
-                            0,
-                            1
-                        ]
+                        "offsets": [-1, 0, 1]
                     },
                     {
                         "args": {},
                         "factory_name": "is_first",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ]
+                        "offsets": [-2, -1, 0]
                     },
                     {
                         "args": {},
                         "factory_name": "is_last",
-                        "offsets": [
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [0, 1, 2]
                     },
                     {
-                        "args": {
-                            "n": 1
-                        },
+                        "args": {"n": 1},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            0
-                        ]
+                        "offsets": [0]
                     },
                     {
-                        "args": {
-                            "n": 2
-                        },
+                        "args": {"n": 2},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1,
-                            0
-                        ]
+                        "offsets": [-1, 0]
                     },
                     {
-                        "args": {
-                            "n": 3
-                        },
+                        "args": {"n": 3},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1
-                        ]
+                        "offsets": [-1]
                     },
                     {
                         "args": {
@@ -104,23 +70,13 @@
                             "tagging_scheme_code": 2
                         },
                         "factory_name": "entity_match",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ],
+                        "offsets": [-2, -1, 0],
                         "drop_out": 0.5
                     },
                     {
-                        "args": {
-                            "tagging_scheme_code": 1
-                        },
+                        "args": {"tagging_scheme_code": 1},
                         "factory_name": "builtin_entity_match",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ]
+                        "offsets": [-2, -1, 0]
                     }
                 ],
                 "crf_args": {
diff --git a/snips_nlu/default_configs/config_pt_pt.py b/snips_nlu/default_configs/config_pt_pt.py
index e8a478b5b..f831cd59d 100644
--- a/snips_nlu/default_configs/config_pt_pt.py
+++ b/snips_nlu/default_configs/config_pt_pt.py
@@ -22,13 +22,7 @@
                             "n": 1
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [-2, -1, 0, 1, 2]
                     },
                     {
                         "args": {
@@ -38,65 +32,37 @@
                             "n": 2
                         },
                         "factory_name": "ngram",
-                        "offsets": [
-                            -2,
-                            1
-                        ]
+                        "offsets": [-2, 1]
                     },
                     {
                         "args": {},
                         "factory_name": "is_digit",
-                        "offsets": [
-                            -1,
-                            0,
-                            1
-                        ]
+                        "offsets": [-1, 0, 1]
                     },
                     {
                         "args": {},
                         "factory_name": "is_first",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ]
+                        "offsets": [-2, -1, 0]
                     },
                     {
                         "args": {},
                         "factory_name": "is_last",
-                        "offsets": [
-                            0,
-                            1,
-                            2
-                        ]
+                        "offsets": [0, 1, 2]
                     },
                     {
-                        "args": {
-                            "n": 1
-                        },
+                        "args": {"n": 1},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            0
-                        ]
+                        "offsets": [0]
                     },
                     {
-                        "args": {
-                            "n": 2
-                        },
+                        "args": {"n": 2},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1,
-                            0
-                        ]
+                        "offsets": [-1, 0]
                     },
                     {
-                        "args": {
-                            "n": 3
-                        },
+                        "args": {"n": 3},
                         "factory_name": "shape_ngram",
-                        "offsets": [
-                            -1
-                        ]
+                        "offsets": [-1]
                     },
                     {
                         "args": {
@@ -104,23 +70,13 @@
                             "tagging_scheme_code": 2
                         },
                         "factory_name": "entity_match",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ],
+                        "offsets": [-2, -1, 0],
                         "drop_out": 0.5
                     },
                     {
-                        "args": {
-                            "tagging_scheme_code": 1
-                        },
+                        "args": {"tagging_scheme_code": 1},
                         "factory_name": "builtin_entity_match",
-                        "offsets": [
-                            -2,
-                            -1,
-                            0
-                        ]
+                        "offsets": [-2, -1, 0]
                     }
                 ],
                 "crf_args": {