Removed unnecessary imports

src/train_tokeniser.py

@@ -1,8 +1,8 @@
 import json
 from transformers import T5TokenizerFast
+from tokenizers.normalizers import Lowercase
 from tokenizers.pre_tokenizers import Whitespace
 from tokenizers import Tokenizer, models, trainers
-from tokenizers.normalizers import NFD, Lowercase, StripAccents, Sequence
 
 
 # Load corpus data