add model cache and fix font

app.py

@@ -78,7 +78,10 @@ def predict(model_name, text):
     tokenized_text = tokenizer([text], return_tensors='pt')
 
     input_tokens = tokenizer.convert_ids_to_tokens(tokenized_text.input_ids[0])
-    input_tokens = util.bytetokens_to_unicdode(input_tokens) if config.model_type in ['roberta', 'gpt', 'gpt2'] else input_tokens
+    try:
+        input_tokens = util.bytetokens_to_unicdode(input_tokens) if config.model_type in ['roberta', 'gpt', 'gpt2'] else input_tokens
+    except KeyError:
+        input_tokens = input_tokens
 
     model.eval()
     output, attention = model(**tokenized_text, output_attentions=True, return_dict=False)