Update dataset.py

change recursive approach to while loop, avoiding potential memory leak.

src/f5_tts/model/dataset.py

@@ -127,38 +127,44 @@ class CustomDataset(Dataset):
         return len(self.data)
 
     def __getitem__(self, index):
-        row = self.data[index]
-        audio_path = row["audio_path"]
-        text = row["text"]
-        duration = row["duration"]
-
+        while True:
+            row = self.data[index]
+            audio_path = row["audio_path"]
+            text = row["text"]
+            duration = row["duration"]
+    
+            # Check if the duration is within the acceptable range
+            if 0.3 <= duration <= 30:
+                break  # Valid sample found, exit the loop
+    
+            # Move to the next index and wrap around if necessary
+            index = (index + 1) % len(self.data)
+    
         if self.preprocessed_mel:
             mel_spec = torch.tensor(row["mel_spec"])
-
         else:
             audio, source_sample_rate = torchaudio.load(audio_path)
+    
+            # If the audio has multiple channels, convert it to mono
             if audio.shape[0] > 1:
                 audio = torch.mean(audio, dim=0, keepdim=True)
-
-            if duration > 30 or duration < 0.3:
-                return self.__getitem__((index + 1) % len(self.data))
-
+    
+            # Resample the audio if necessary
             if source_sample_rate != self.target_sample_rate:
                 resampler = torchaudio.transforms.Resample(source_sample_rate, self.target_sample_rate)
                 audio = resampler(audio)
-
+    
+            # Compute the mel spectrogram
             mel_spec = self.mel_spectrogram(audio)
-            mel_spec = mel_spec.squeeze(0)  # '1 d t -> d t')
-
-        return dict(
-            mel_spec=mel_spec,
-            text=text,
-        )
+            mel_spec = mel_spec.squeeze(0)  # Convert from (1, D, T) to (D, T)
+    
+        return {
+            "mel_spec": mel_spec,
+            "text": text,
+        }
 
 
 # Dynamic Batch Sampler
-
-
 class DynamicBatchSampler(Sampler[list[int]]):
     """Extension of Sampler that will do the following:
     1.  Change the batch size (essentially number of sequences)