fix: disable usage of root logger (#7296)

* fix: disable usage of root logger

`logging.basicConfig` configures Python's root logger. This prohibits
fine control of logging, overwrites logging configuration done outside
the package, and is not best practice. Instead, the used logger is now
configured directly, and the root logger is untouched.

Example:
    If yolov5 is used as part of another project with some sophisticated
    logging, the internal `logging.basicConfig` call overwrites all the
    external configuration.

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* Update general.py

* Update general.py

* Comment kaggle

* Uncomment kaggle

Co-authored-by: Maximilian Strobel <Maximilian.Strobel@infineon.com>
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

utils/general.py

@@ -82,11 +82,17 @@ def set_logging(name=None, verbose=VERBOSE):
         for h in logging.root.handlers:
             logging.root.removeHandler(h)  # remove all handlers associated with the root logger object
     rank = int(os.getenv('RANK', -1))  # rank in world for Multi-GPU trainings
-    logging.basicConfig(format="%(message)s", level=logging.INFO if (verbose and rank in (-1, 0)) else logging.WARNING)
-    return logging.getLogger(name)
+    level = logging.INFO if (verbose and rank in (-1, 0)) else logging.WARNING
+    log = logging.getLogger(name)
+    log.setLevel(level)
+    handler = logging.StreamHandler()
+    handler.setFormatter(logging.Formatter("%(message)s"))
+    handler.setLevel(level)
+    log.addHandler(handler)
 
 
-LOGGER = set_logging('yolov5')  # define globally (used in train.py, val.py, detect.py, etc.)
+set_logging()  # run before defining LOGGER
+LOGGER = logging.getLogger("yolov5")  # define globally (used in train.py, val.py, detect.py, etc.)
 
 
 def user_config_dir(dir='Ultralytics', env_var='YOLOV5_CONFIG_DIR'):