feat: use fast tokenizer

src/dalle_mini/model/tokenizer.py

@@ -1,5 +1,5 @@
 """ DalleBart tokenizer """
-from transformers import BartTokenizer
+from transformers import BartTokenizerFast
 from transformers.utils import logging
 
 from .utils import PretrainedFromWandbMixin
@@ -7,5 +7,5 @@ from .utils import PretrainedFromWandbMixin
 logger = logging.get_logger(__name__)
 
 
-class DalleBartTokenizer(PretrainedFromWandbMixin, BartTokenizer):
+class DalleBartTokenizer(PretrainedFromWandbMixin, BartTokenizerFast):
     pass