Removing `more_itertools` dependency. (#21473)

* Removing `more_itertools` dependency.

* Update examples/research_projects/vqgan-clip/requirements.txt

src/transformers/models/whisper/english_normalizer.py

@@ -14,17 +14,10 @@
 # limitations under the License.
 
 import re
+import unicodedata
 from fractions import Fraction
 from typing import Iterator, List, Match, Optional, Union
 
-from ...utils import is_more_itertools_available
-
-
-if is_more_itertools_available():
-    from more_itertools import windowed
-
-import unicodedata
-
 import regex
 
 
@@ -240,7 +233,9 @@ class EnglishNumberNormalizer:
         if len(words) == 0:
             return
 
-        for prev, current, next in windowed([None] + words + [None], 3):
+        for i, current in enumerate(words):
+            prev = words[i - 1] if i != 0 else None
+            next = words[i + 1] if i != len(words) - 1 else None
             if skip:
                 skip = False
                 continue

src/transformers/utils/__init__.py

@@ -116,7 +116,6 @@ from .import_utils import (
     is_kenlm_available,
     is_keras_nlp_available,
     is_librosa_available,
-    is_more_itertools_available,
     is_natten_available,
     is_ninja_available,
     is_onnx_available,

src/transformers/utils/import_utils.py

@@ -496,10 +496,6 @@ def is_detectron2_available():
     return _detectron2_available
 
 
-def is_more_itertools_available():
-    return importlib.util.find_spec("more_itertools") is not None
-
-
 def is_rjieba_available():
     return importlib.util.find_spec("rjieba") is not None