From 99f05ed23f818d4f21c2c6925a66e75df606c859 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adrian=20W=C3=A4lchli?= <aedu.waelchli@gmail.com>
Date: Sun, 20 Sep 2020 00:29:06 +0200
Subject: [PATCH] fix warnings on windows (#3555)

---
 pytorch_lightning/metrics/converters.py | 8 ++------
 pytorch_lightning/metrics/sklearns.py   | 8 ++------
 2 files changed, 4 insertions(+), 12 deletions(-)

diff --git a/pytorch_lightning/metrics/converters.py b/pytorch_lightning/metrics/converters.py
index b43462cddc..f62a470981 100644
--- a/pytorch_lightning/metrics/converters.py
+++ b/pytorch_lightning/metrics/converters.py
@@ -26,18 +26,14 @@ import numpy as np
 import torch
 from torch.utils.data._utils.collate import np_str_obj_array_pattern
 
-from pytorch_lightning.utilities import rank_zero_warn
 from pytorch_lightning.utilities.apply_func import apply_to_collection
 
-try:
+if torch.distributed.is_available():
     from torch.distributed import ReduceOp
-except ImportError:
-
+else:
     class ReduceOp:
         SUM = None
 
-    rank_zero_warn("Unsupported `ReduceOp` for distributed computing")
-
 
 def _apply_to_inputs(func_to_apply: Callable, *dec_args, **dec_kwargs) -> Callable:
     """
diff --git a/pytorch_lightning/metrics/sklearns.py b/pytorch_lightning/metrics/sklearns.py
index 4cb7cca0a4..d19bd05e63 100644
--- a/pytorch_lightning/metrics/sklearns.py
+++ b/pytorch_lightning/metrics/sklearns.py
@@ -19,17 +19,13 @@ import torch
 
 from pytorch_lightning import _logger as lightning_logger
 from pytorch_lightning.metrics.metric import NumpyMetric
-from pytorch_lightning.utilities import rank_zero_warn
 
-try:
+if torch.distributed.is_available():
     from torch.distributed import group
-except ImportError:
-
+else:
     class group:
         WORLD = None
 
-    rank_zero_warn("Unsupported `group` for distributed computing.")
-
 
 class SklearnMetric(NumpyMetric):
     """