ultralytics 8.1.44 add IS_RASPBERRYPI and constants refactor (#9827)

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: UltralyticsAssistant <web@ultralytics.com>

tests/test_integrations.py

@@ -34,6 +34,7 @@ def test_mlflow():
 @pytest.mark.skipif(not check_requirements("mlflow", install=False), reason="mlflow not installed")
 def test_mlflow_keep_run_active():
     import os
+
     import mlflow
 
     """Test training with MLflow tracking enabled."""