fix default dist_samlper to False

paddlespeech/s2t/exps/u2/model.py

@@ -241,7 +241,7 @@ class U2Trainer(Trainer):
                 n_iter_processes=config.num_workers,
                 subsampling_factor=1,
                 num_encs=1,
-                dist_sampler=True,
+                dist_sampler=False,
                 shortest_first=False)
 
             self.valid_loader = BatchDataLoader(
@@ -262,7 +262,7 @@ class U2Trainer(Trainer):
                 n_iter_processes=config.num_workers,
                 subsampling_factor=1,
                 num_encs=1,
-                dist_sampler=True,
+                dist_sampler=False,
                 shortest_first=False)
             logger.info("Setup train/valid Dataloader!")
         else: