Limit `ray<2.9.3` due to bug in `ray==2.10.0` (#9254)

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

.github/workflows/ci.yaml

@@ -187,7 +187,8 @@ jobs:
         run: |
           slow=""
           if [[ "${{ github.event_name }}" == "schedule" ]] || [[ "${{ github.event_name }}" == "workflow_dispatch" ]]; then
-              pip install mlflow pycocotools 'ray[tune]'
+              # WARNING bug in ray>=2.10.0
+              pip install mlflow pycocotools "ray[tune]<=2.9.3"
               slow="--slow"
           fi
           pytest $slow --cov=ultralytics/ --cov-report xml tests/

docs/en/integrations/ray-tune.md

@@ -34,7 +34,7 @@ To install the required packages, run:
 
         ```bash
         # Install and update Ultralytics and Ray Tune packages
-        pip install -U ultralytics "ray[tune]"
+        pip install -U ultralytics "ray[tune]<=2.9.3"
 
         # Optionally install W&B for logging
         pip install wandb

ultralytics/utils/tuner.py

@@ -3,7 +3,7 @@
 import subprocess
 
 from ultralytics.cfg import TASK2DATA, TASK2METRIC, get_save_dir
-from ultralytics.utils import DEFAULT_CFG, DEFAULT_CFG_DICT, LOGGER, NUM_THREADS
+from ultralytics.utils import DEFAULT_CFG, DEFAULT_CFG_DICT, LOGGER, NUM_THREADS, checks
 
 
 def run_ray_tune(
@@ -40,7 +40,7 @@ def run_ray_tune(
         train_args = {}
 
     try:
-        subprocess.run("pip install ray[tune]".split(), check=True)
+        subprocess.run("pip install ray[tune]<=2.9.3".split(), check=True)  # do not add single quotes here
 
         import ray
         from ray import tune
@@ -48,7 +48,7 @@ def run_ray_tune(
         from ray.air.integrations.wandb import WandbLoggerCallback
         from ray.tune.schedulers import ASHAScheduler
     except ImportError:
-        raise ModuleNotFoundError('Tuning hyperparameters requires Ray Tune. Install with: pip install "ray[tune]"')
+        raise ModuleNotFoundError('Ray Tune required but not found. To install run: pip install "ray[tune]<=2.9.3"')
 
     try:
         import wandb
@@ -57,6 +57,7 @@ def run_ray_tune(
     except (ImportError, AssertionError):
         wandb = False
 
+    checks.check_version(ray.__version__, "<=2.9.3", "ray")
     default_space = {
         # 'optimizer': tune.choice(['SGD', 'Adam', 'AdamW', 'NAdam', 'RAdam', 'RMSProp']),
         "lr0": tune.uniform(1e-5, 1e-1),