fix _calc_label to support windows

music_genre.py

@@ -123,6 +123,9 @@ class music_genre(datasets.GeneratorBasedBuilder):
 
         labstr = dirpath[substr_index + len(mel):]
         labs = labstr.split('/')
+        if len(labs) == 0:
+            labs = labstr.split('\\')
+
         if depth <= len(labs):
             return int(labs[depth - 1].split('_')[0])
         else: