fix: bad iteration

musdb18.py

@@ -63,9 +63,9 @@ class Musdb18Dataset(datasets.GeneratorBasedBuilder):
             )
         ]
 
-    def _generate_stem_dict(self, S, song_name, start):
+    def _generate_stem_dict(self, S, song_name, end):
         return {name: {"path": f"{song_name}/{name}",
-                       "array": S[i, start:start+self.WINDOW_SIZE, :], "sampling_rate": self.SAMPLING_RATE}
+                       "array": S[i, end-self.WINDOW_SIZE:end, :], "sampling_rate": self.SAMPLING_RATE}
                 for i, name in enumerate(self.INSTRUMENT_NAMES)}
 
     def _generate_examples(self, audio_path):
@@ -75,11 +75,11 @@ class Musdb18Dataset(datasets.GeneratorBasedBuilder):
             S, sr = stempeg.read_stems(
                 str(stems_path), dtype=np.float32, multiprocess=False)
 
-            for idx, start in enumerate(range(0, S.shape[1], self.WINDOW_SIZE)):
+            for idx, end in enumerate(range(self.WINDOW_SIZE, S.shape[1], self.WINDOW_SIZE)):
                 yield id_, {
                     "name": song_name,
                     "n_window": idx,
-                    **self._generate_stem_dict(S, song_name, start)
+                    **self._generate_stem_dict(S, song_name, end)
                 }
 
                 id_ += 1
@@ -88,7 +88,7 @@ class Musdb18Dataset(datasets.GeneratorBasedBuilder):
             yield id_, {
                 "name": song_name,
                 "n_window": idx+1,
-                **self._generate_stem_dict(S, song_name, start=S.shape[1] - self.WINDOW_SIZE)
+                **self._generate_stem_dict(S, song_name, end=S.shape[1])
             }
 
             id_ += 1