added cpu 16 bit

pytorch_lightning/models/trainer.py

@@ -344,7 +344,7 @@ class Trainer(TrainerIO):
         # run training
         for batch_i, data_batch in enumerate(dataloader):
 
-            if data_batch is None:
+            if data_batch is None:  # pragma: no cover
                 continue
 
             # stop short when on fast dev run

tests/test_models.py

@@ -111,6 +111,26 @@ def test_cpu_model():
     run_gpu_model_test(trainer_options, model, hparams, on_gpu=False)
 
 
+def test_cpu_model_with_amp():
+    """
+    Make sure model trains on CPU
+    :return:
+    """
+
+    trainer_options = dict(
+        progress_bar=False,
+        experiment=get_exp(),
+        max_nb_epochs=1,
+        train_percent_check=0.4,
+        val_percent_check=0.4,
+        use_amp=True
+    )
+
+    model, hparams = get_model()
+
+    run_gpu_model_test(trainer_options, model, hparams, on_gpu=False)
+
+
 def test_all_features_cpu_model():
     """
     Test each of the trainer options