Fix yolo checks as a package bug in Colab (#972)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Sergio Sanchez <sergio.ssm.97@gmail.com>

ultralytics/yolo/cfg/__init__.py

@@ -216,6 +216,9 @@ def entrypoint(debug=''):
 
     overrides = {}  # basic overrides, i.e. imgsz=320
     for a in merge_equals_args(args):  # merge spaces around '=' sign
+        if a.startswith('--'):
+            LOGGER.warning(f"WARNING ⚠️ '{a}' does not require leading dashes '--', updating to '{a[2:]}'.")
+            a = a[2:]
         if '=' in a:
             try:
                 re.sub(r' *= *', '=', a)  # remove spaces around equals sign
@@ -263,7 +266,7 @@ def entrypoint(debug=''):
         mode = DEFAULT_CFG.mode or 'predict'
         LOGGER.warning(f"WARNING ⚠️ 'mode' is missing. Valid modes are {modes}. Using default 'mode={mode}'.")
     elif mode not in modes:
-        if mode != 'checks':
+        if mode not in ('checks', checks):
             raise ValueError(f"Invalid 'mode={mode}'. Valid modes are {modes}.\n{CLI_HELP_MSG}")
         LOGGER.warning("WARNING ⚠️ 'yolo mode=checks' is deprecated. Use 'yolo checks' instead.")
         checks.check_yolo()