diff --git a/examples/summarization/bart/finetune.py b/examples/summarization/bart/finetune.py
index 58cdccf443d..9e3d55b3e94 100644
--- a/examples/summarization/bart/finetune.py
+++ b/examples/summarization/bart/finetune.py
@@ -166,8 +166,12 @@ def main(args):
 
     # Optionally, predict on dev set and write to output_dir
     if args.do_predict:
+        # See https://github.com/huggingface/transformers/issues/3159
+        # pl use this format to create a checkpoint:
+        # https://github.com/PyTorchLightning/pytorch-lightning/blob/master\
+        # /pytorch_lightning/callbacks/model_checkpoint.py#L169
         checkpoints = list(sorted(glob.glob(os.path.join(args.output_dir, "checkpointepoch=*.ckpt"), recursive=True)))
-        SummarizationTrainer.load_from_checkpoint(checkpoints[-1])
+        model = model.load_from_checkpoint(checkpoints[-1])
         trainer.test(model)
 
 
diff --git a/examples/summarization/bart/test_bart_examples.py b/examples/summarization/bart/test_bart_examples.py
index ae137975964..199076d84f6 100644
--- a/examples/summarization/bart/test_bart_examples.py
+++ b/examples/summarization/bart/test_bart_examples.py
@@ -94,7 +94,15 @@ class TestBartExamples(unittest.TestCase):
         )
         main(argparse.Namespace(**args_d))
         args_d.update({"do_train": False, "do_predict": True})
+
         main(argparse.Namespace(**args_d))
+        contents = os.listdir(output_dir)
+        expected_contents = {
+            "checkpointepoch=0.ckpt",
+            "test_results.txt",
+        }
+        created_files = {os.path.basename(p) for p in contents}
+        self.assertSetEqual(expected_contents, created_files)
 
     def test_t5_run_sum_cli(self):
         args_d: dict = DEFAULT_ARGS.copy()
@@ -111,6 +119,7 @@ class TestBartExamples(unittest.TestCase):
             do_predict=True,
         )
         main(argparse.Namespace(**args_d))
+
         # args_d.update({"do_train": False, "do_predict": True})
         # main(argparse.Namespace(**args_d))
 
diff --git a/examples/transformer_base.py b/examples/transformer_base.py
index a3b81610ea6..0ab355ad657 100644
--- a/examples/transformer_base.py
+++ b/examples/transformer_base.py
@@ -1,3 +1,4 @@
+import argparse
 import logging
 import os
 import random
@@ -38,7 +39,7 @@ MODEL_MODES = {
 }
 
 
-def set_seed(args):
+def set_seed(args: argparse.Namespace):
     random.seed(args.seed)
     np.random.seed(args.seed)
     torch.manual_seed(args.seed)
@@ -47,7 +48,7 @@ def set_seed(args):
 
 
 class BaseTransformer(pl.LightningModule):
-    def __init__(self, hparams, num_labels=None, mode="base", **config_kwargs):
+    def __init__(self, hparams: argparse.Namespace, num_labels=None, mode="base", **config_kwargs):
         "Initialize a model."
 
         super(BaseTransformer, self).__init__()
@@ -192,7 +193,7 @@ class BaseTransformer(pl.LightningModule):
 
 
 class LoggingCallback(pl.Callback):
-    def on_validation_end(self, trainer, pl_module):
+    def on_validation_end(self, trainer: pl.Trainer, pl_module: pl.LightningModule):
         logger.info("***** Validation results *****")
         if pl_module.is_logger():
             metrics = trainer.callback_metrics
@@ -201,7 +202,7 @@ class LoggingCallback(pl.Callback):
                 if key not in ["log", "progress_bar"]:
                     logger.info("{} = {}\n".format(key, str(metrics[key])))
 
-    def on_test_end(self, trainer, pl_module):
+    def on_test_end(self, trainer: pl.Trainer, pl_module: pl.LightningModule):
         logger.info("***** Test results *****")
 
         if pl_module.is_logger():
@@ -256,7 +257,7 @@ def add_generic_args(parser, root_dir):
     parser.add_argument("--seed", type=int, default=42, help="random seed for initialization")
 
 
-def generic_train(model, args):
+def generic_train(model: BaseTransformer, args: argparse.Namespace):
     # init model
     set_seed(args)