Add new dataset support to preprocess parameter

pre.py

@@ -41,7 +41,7 @@ if __name__ == "__main__":
         "Use this option when dataset does not include alignments\
         (these are used to split long audio files into sub-utterances.)")
     parser.add_argument("-d", "--dataset", type=str, default="aidatatang_200zh", help=\
-        "Name of the dataset to process, allowing values: magicdata, aidatatang_200zh, aishell3.")
+        "Name of the dataset to process, allowing values: magicdata, aidatatang_200zh, aishell3, data_aishell.")
     parser.add_argument("-e", "--encoder_model_fpath", type=Path, default="encoder/saved_models/pretrained.pt", help=\
         "Path your trained encoder model.")
     parser.add_argument("-ne", "--n_processes_embed", type=int, default=1, help=\