fix: add eng to tokens function

predict.py

@@ -22,6 +22,25 @@ SHOW_NUM = 5
 NUM_HEADS = 8
 DROPOUT_RATE = 0.5
 
+def en2tokens(en_sentence, en_vocab, for_model=False, en_seq=50):
+    '''
+        English to tokens
+
+        Args:
+            en_sentence (str)
+            en_vocab (torchtext.Vocab)
+            
+            for_model (bool, default=False): if `True`, it will add <SOS>, <END>, <PAD> tokens
+            en_seq (int): for padding <PAD>
+        Outputs:
+            tokens (LongTensor): (b,)
+    '''
+    tokenizer = torchtext.data.utils.get_tokenizer("basic_english")
+    tokens = en_vocab( tokenizer(en_sentence.lower()) )
+    if for_model:
+        tokens = [ en_vocab['<SOS>'] ] + tokens + [ en_vocab['<END>'] ]
+        tokens = tokens + [ en_vocab['<PAD>'] for _ in range(en_seq - len(tokens)) ]
+    return torch.LongTensor(tokens)
 
 def predict(en_str, model, en_vocab, ch_vocab):