Fix colliding dataset cache file names (#1994)

* Fix colliding dataset cache file names

* Remove unused code

TTS/tts/datasets/dataset.py

@@ -1,3 +1,4 @@
+import base64
 import collections
 import os
 import random
@@ -34,6 +35,12 @@ def noise_augment_audio(wav):
     return wav + (1.0 / 32768.0) * np.random.rand(*wav.shape)
 
 
+def string2filename(string):
+    # generate a safe and reversible filename based on a string
+    filename = base64.urlsafe_b64encode(string.encode("utf-8")).decode("utf-8", "ignore")
+    return filename
+
+
 class TTSDataset(Dataset):
     def __init__(
         self,
@@ -201,7 +208,7 @@ def get_phonemes(self, idx, text):
     def get_f0(self, idx):
         out_dict = self.f0_dataset[idx]
         item = self.samples[idx]
-        assert item["audio_file"] == out_dict["audio_file"]
+        assert item["audio_unique_name"] == out_dict["audio_unique_name"]
         return out_dict
 
     @staticmethod
@@ -561,19 +568,18 @@ def __init__(
 
     def __getitem__(self, index):
         item = self.samples[index]
-        ids = self.compute_or_load(item["audio_file"], item["text"])
+        ids = self.compute_or_load(string2filename(item["audio_unique_name"]), item["text"])
         ph_hat = self.tokenizer.ids_to_text(ids)
         return {"text": item["text"], "ph_hat": ph_hat, "token_ids": ids, "token_ids_len": len(ids)}
 
     def __len__(self):
         return len(self.samples)
 
-    def compute_or_load(self, wav_file, text):
+    def compute_or_load(self, file_name, text):
         """Compute phonemes for the given text.
 
         If the phonemes are already cached, load them from cache.
         """
-        file_name = os.path.splitext(os.path.basename(wav_file))[0]
         file_ext = "_phoneme.npy"
         cache_path = os.path.join(self.cache_path, file_name + file_ext)
         try:
@@ -670,11 +676,11 @@ def __init__(
 
     def __getitem__(self, idx):
         item = self.samples[idx]
-        f0 = self.compute_or_load(item["audio_file"])
+        f0 = self.compute_or_load(item["audio_file"], string2filename(item["audio_unique_name"]))
         if self.normalize_f0:
             assert self.mean is not None and self.std is not None, " [!] Mean and STD is not available"
             f0 = self.normalize(f0)
-        return {"audio_file": item["audio_file"], "f0": f0}
+        return {"audio_unique_name": item["audio_unique_name"], "f0": f0}
 
     def __len__(self):
         return len(self.samples)
@@ -706,8 +712,7 @@ def get_pad_id(self):
         return self.pad_id
 
     @staticmethod
-    def create_pitch_file_path(wav_file, cache_path):
-        file_name = os.path.splitext(os.path.basename(wav_file))[0]
+    def create_pitch_file_path(file_name, cache_path):
         pitch_file = os.path.join(cache_path, file_name + "_pitch.npy")
         return pitch_file
 
@@ -745,26 +750,26 @@ def denormalize(self, pitch):
         pitch[zero_idxs] = 0.0
         return pitch
 
-    def compute_or_load(self, wav_file):
+    def compute_or_load(self, wav_file, audio_unique_name):
         """
         compute pitch and return a numpy array of pitch values
         """
-        pitch_file = self.create_pitch_file_path(wav_file, self.cache_path)
+        pitch_file = self.create_pitch_file_path(audio_unique_name, self.cache_path)
         if not os.path.exists(pitch_file):
             pitch = self._compute_and_save_pitch(self.ap, wav_file, pitch_file)
         else:
             pitch = np.load(pitch_file)
         return pitch.astype(np.float32)
 
     def collate_fn(self, batch):
-        audio_file = [item["audio_file"] for item in batch]
+        audio_unique_name = [item["audio_unique_name"] for item in batch]
         f0s = [item["f0"] for item in batch]
         f0_lens = [len(item["f0"]) for item in batch]
         f0_lens_max = max(f0_lens)
         f0s_torch = torch.LongTensor(len(f0s), f0_lens_max).fill_(self.get_pad_id())
         for i, f0_len in enumerate(f0_lens):
             f0s_torch[i, :f0_len] = torch.LongTensor(f0s[i])
-        return {"audio_file": audio_file, "f0": f0s_torch, "f0_lens": f0_lens}
+        return {"audio_unique_name": audio_unique_name, "f0": f0s_torch, "f0_lens": f0_lens}
 
     def print_logs(self, level: int = 0) -> None:
         indent = "\t" * level