Standardize warnings with WARNING ⚠️ ... (#9467)

* Standardize warnings

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

utils/torch_utils.py

@@ -47,7 +47,7 @@ def smartCrossEntropyLoss(label_smoothing=0.0):
     if check_version(torch.__version__, '1.10.0'):
         return nn.CrossEntropyLoss(label_smoothing=label_smoothing)
     if label_smoothing > 0:
-        LOGGER.warning(f'WARNING: label smoothing {label_smoothing} requires torch>=1.10.0')
+        LOGGER.warning(f'WARNING ⚠️ label smoothing {label_smoothing} requires torch>=1.10.0')
     return nn.CrossEntropyLoss()