!1315 Fixes Wavenet GPU training error

Merge pull request !1315 from huangbo/master_1209

research/audio/wavenet/train.py

@@ -167,7 +167,7 @@ if __name__ == '__main__':
         optimizer = Adam(weights, learning_rate=lr, loss_scale=1024.)
         train_net = TrainOneStepCell(loss_net, optimizer)
 
-    if target != 'CPU':
+    if target == 'Ascend':
         summary_collector = SummaryCollector(summary_dir='summary_dir/device_{}'.format(device_id), collect_freq=1)
     model = Model(train_net)
     lr_cb = Monitor(lr)
@@ -180,7 +180,7 @@ if __name__ == '__main__':
     config_ck = CheckpointConfig(save_checkpoint_steps=step_size_per_epoch, keep_checkpoint_max=hparams.nepochs)
     ckpt_cb = ModelCheckpoint(prefix='wavenet', directory=ckpt_path, config=config_ck)
     callback_list.append(ckpt_cb)
-    if target != 'CPU':
+    if target == 'Ascend':
         callback_list.append(summary_collector)
     if target == 'Ascend' and resume_epoch is not None:
         model.train(hparams.nepochs - resume_epoch, data_loaders, callbacks=callback_list, dataset_sink_mode=False)