diff --git a/pytorch_lightning/models/trainer.py b/pytorch_lightning/models/trainer.py
index 9cdbd7c2..6aa2ab54 100644
--- a/pytorch_lightning/models/trainer.py
+++ b/pytorch_lightning/models/trainer.py
@@ -150,6 +150,16 @@ class Trainer(TrainerIO):
         self.use_ddp = False
         self.use_dp = False
 
+        # training bookeeping
+        self.total_batch_nb = 0
+        self.running_loss = []
+        self.avg_loss = 0
+        self.batch_nb = 0
+        self.tqdm_metrics = {}
+        self.nb_val_batches = None
+        self.nb_tng_batches = None
+        self.nb_test_batches = None
+
         # gpus come in as a string.
         # if gpus = -1 then use all available devices
         # otherwise, split the string using commas
@@ -273,12 +283,6 @@ class Trainer(TrainerIO):
         return self.__tng_tqdm_dic
 
     def __layout_bookeeping(self):
-        # training bookeeping
-        self.total_batch_nb = 0
-        self.running_loss = []
-        self.avg_loss = 0
-        self.batch_nb = 0
-        self.tqdm_metrics = {}
 
         # determine number of training batches
         self.nb_tng_batches = len(self.tng_dataloader)
diff --git a/tests/debug.py b/tests/debug.py
index 34da26ed..3f0c58f0 100644
--- a/tests/debug.py
+++ b/tests/debug.py
@@ -50,7 +50,7 @@ def main():
         progress_bar=False,
         experiment=get_exp(),
         max_nb_epochs=1,
-        train_percent_check=1.0,
+        train_percent_check=0.4,
         val_percent_check=0.4,
         gpus=[0, 1],
         distributed_backend='ddp',