added pretrainer to the hyperparams.yaml

hyperparams.yaml

@@ -173,3 +173,10 @@ checkpointer: !new:speechbrain.utils.checkpoints.Checkpointer
     lr_scheduler: *id007
 train_logger: !new:speechbrain.utils.train_logger.FileTrainLogger
   save_file: results/sepformer-wham-enhancement/1234/train_log.txt
+
+pretrainer: !new:speechbrain.utils.parameter_transfer.Pretrainer
+  loadables:
+    encoder: !ref <Encoder>
+    masknet: !ref <MaskNet>
+    decoder: !ref <Decoder>
+