Fix zero seed (#766)

* Change the behavior of seed 0 from randomized to fixed

* Add a warning message to notify the behavior change of the seed zero

* Update a comment

anomalib/config/config.py

@@ -142,6 +142,15 @@ def get_configurable_parameters(
     # keep track of the original config file because it will be modified
     config_original: DictConfig = config.copy()
 
+    # if the seed value is 0, notify a user that the behavior of the seed value zero has been changed.
+    if config.project.get("seed") == 0:
+        warn(
+            "The seed value is now fixed to 0. "
+            "Up to v0.3.7, the seed was not fixed when the seed value was set to 0. "
+            "If you want to use the random seed, please select `None` for the seed value "
+            "(`null` in the YAML file) or remove the `seed` key from the YAML file."
+        )
+
     # Dataset Configs
     if "format" not in config.dataset.keys():
         config.dataset.format = "mvtec"

tools/hpo/sweep.py

@@ -35,7 +35,7 @@ def get_args():
     model_config = get_configurable_parameters(model_name=args.model, config_path=args.model_config)
     hpo_config = OmegaConf.load(args.sweep_config)
 
-    if model_config.project.seed != 0:
+    if model_config.project.get("seed") is not None:
         seed_everything(model_config.project.seed)
 
     # check hpo config structure to see whether it adheres to comet or wandb format

tools/train.py

@@ -47,7 +47,7 @@ def train():
         warnings.filterwarnings("ignore")
 
     config = get_configurable_parameters(model_name=args.model, config_path=args.config)
-    if config.project.seed:
+    if config.project.get("seed") is not None:
         seed_everything(config.project.seed)
 
     datamodule = get_datamodule(config)