W&B: Login only in master processes (ultralytics#4866)

* evolve fix

* Enable login timeout

* fix pkg

* check rank

* don't relogin

utils/loggers/wandb/wandb_utils.py

@@ -19,16 +19,17 @@
 from utils.datasets import img2label_paths
 from utils.general import check_dataset, check_file
 
+RANK = int(os.getenv('RANK', -1))
+
 try:
     import wandb
 
     assert hasattr(wandb, '__version__')  # verify package import not local dir
-    if pkg.parse_version(wandb.__version__) >= pkg.parse_version('0.12.2'):
+    if pkg.parse_version(wandb.__version__) >= pkg.parse_version('0.12.2') and RANK in [0, -1]:
         wandb.login(timeout=30)
 except (ImportError, AssertionError):
     wandb = None
 
-RANK = int(os.getenv('RANK', -1))
 WANDB_ARTIFACT_PREFIX = 'wandb-artifact://'