fix the wrong GPU index issue of multi-node

configs/metadata.json

@@ -1,7 +1,8 @@
 {
     "schema": "https://github.com/Project-MONAI/MONAI-extra-test-data/releases/download/0.8.1/meta_schema_20220324.json",
-    "version": "0.5.5",
+    "version": "0.5.6",
     "changelog": {
+        "0.5.6": "fix the wrong GPU index issue of multi-node",
         "0.5.5": "modify mgpu logging level",
         "0.5.4": "retrain using an internal pretrained ResNet18",
         "0.5.3": "make the training bundle deterministic",
@@ -26,7 +27,7 @@
         "0.1.1": "fix location variable name change",
         "0.1.0": "initialize release of the bundle"
     },
-    "monai_version": "1.2.0rc6",
+    "monai_version": "1.2.0",
     "pytorch_version": "1.13.1",
     "numpy_version": "1.22.2",
     "optional_packages_version": {

configs/multi_gpu_train.json

@@ -1,5 +1,5 @@
 {
-    "device": "$torch.device(f'cuda:{dist.get_rank()}')",
+    "device": "$torch.device('cuda:' + os.environ['LOCAL_RANK'])",
     "network": {
         "_target_": "torch.nn.parallel.DistributedDataParallel",
         "module": "$@network_def.to(@device)",