remove extra comments that moved to cloud_io

Author: f4hy

pytorch_lightning/core/saving.py

@@ -13,11 +13,6 @@
 from pytorch_lightning.utilities.cloud_io import load as pl_load
 from pytorch_lightning.utilities.cloud_io import gfile, cloud_open
 
-# we want this for tf.iogfile, which if tf is installed gives full tf,
-# otherwise gives a pruned down version which works for some file backends but
-# not all
-from tensorboard.compat import tf
-
 PRIMITIVE_TYPES = (bool, int, float, str)
 ALLOWED_CONFIG_TYPES = (AttributeDict, MutableMapping, Namespace)
 try: