dropped dataset caching

datasets/preprocess.py

@@ -1,18 +1,6 @@
 import os
 
 
-def tts_cache(root_path, meta_file):
-    """This format is set for the meta-file generated by extract_features.py"""
-    txt_file = os.path.join(root_path, meta_file)
-    items = []
-    with open(txt_file, 'r', encoding='utf8') as f:
-        for line in f:
-            cols = line.split('| ')
-            # text, wav_full_path, mel_name, linear_name, wav_len, mel_len
-            items.append(cols)
-    return items
-
-
 def tweb(root_path, meta_file):
     """Normalize TWEB dataset. 
     https://www.kaggle.com/bryanpark/the-world-english-bible-speech-dataset