Fix typo in trainer.rst
deafult -> default
@@ -71,7 +71,7 @@ train
Number of subprocess to load data, default is 0.
* eval_dataset(paddle.io.Dataset)
- The validation dataset, deafult is None. If set, the Trainer will execute evaluate function every `save_interval` epochs.
+ The validation dataset, default is None. If set, the Trainer will execute evaluate function every `save_interval` epochs.
* log_interval(int)
Log the train infomation every `log_interval` steps.
