Logging fix from YOLOv5 (#47)

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

ultralytics/yolo/utils/__init__.py

@@ -14,6 +14,7 @@ NUM_THREADS = min(8, max(1, os.cpu_count() - 1))  # number of YOLOv5 multiproces
 AUTOINSTALL = str(os.getenv('YOLOv5_AUTOINSTALL', True)).lower() == 'true'  # global auto-install mode
 FONT = 'Arial.ttf'  # https://ultralytics.com/assets/Arial.ttf
 VERBOSE = str(os.getenv('YOLOv5_VERBOSE', True)).lower() == 'true'  # global verbose mode
+LOGGING_NAME = 'yolov5'
 
 
 def is_colab():
@@ -87,24 +88,31 @@ def colorstr(*input):
     return "".join(colors[x] for x in args) + f"{string}" + colors["end"]
 
 
-def set_logging(name=None, verbose=VERBOSE):
-    # Sets level and returns logger
-    if is_colab() or is_kaggle():
-        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
+def set_logging(name=LOGGING_NAME, verbose=True):
+    # sets up logging for the given name
+    rank = int(os.getenv('RANK', -1))  # rank in world for Multi-GPU trainings
     level = logging.INFO if verbose and rank in {-1, 0} else logging.ERROR
-    log = logging.getLogger(name)
-    log.setLevel(level)
-    handler = logging.StreamHandler()
-    handler.setFormatter(logging.Formatter("%(message)s"))
-    handler.setLevel(level)
-    log.addHandler(handler)
+    logging.config.dictConfig({
+        "version": 1,
+        "disable_existing_loggers": False,
+        "formatters": {
+            name: {
+                "format": "%(message)s"}},
+        "handlers": {
+            name: {
+                "class": "logging.StreamHandler",
+                "formatter": name,
+                "level": level,}},
+        "loggers": {
+            name: {
+                "level": level,
+                "handlers": [name],
+                "propagate": False,}}})
 
 
-set_logging()  # run before defining LOGGER
-LOGGER = logging.getLogger("yolov5")  # define globally
-if platform.system() == "Windows":
+set_logging(LOGGING_NAME)  # run before defining LOGGER
+LOGGER = logging.getLogger(LOGGING_NAME)  # define globally (used in train.py, val.py, detect.py, etc.)
+if platform.system() == 'Windows':
     for fn in LOGGER.info, LOGGER.warning:
         setattr(LOGGER, fn.__name__, lambda x: fn(emojis(x)))  # emoji safe logging
 
@@ -119,5 +127,5 @@ class TryExcept(contextlib.ContextDecorator):
 
     def __exit__(self, exc_type, value, traceback):
         if value:
-            print(emojis(f'{self.msg}{value}'))
+            print(emojis(f"{self.msg}{': ' if self.msg else ''}{value}"))
         return True