[IMP] Set the Default WG Memory Type to 'distributed' for the MNMG Py…

…G Example (#4532)

For MNMG processing, the only supported memory type is `distributed`.  While it is possible to test using `torchrun` on a single machine, when running on multiple machines, or a SLURM cluster, etc., anything other than `distributed` won't work.  Therefore, this PR makes `distributed` the default memory type for that example to avoid user confusion.

Authors:
  - Alex Barghi (https://github.com/alexbarghi-nv)

Approvers:
  - Rick Ratzel (https://github.com/rlratzel)

URL: #4532

python/cugraph-pyg/cugraph_pyg/examples/gcn_dist_mnmg.py

@@ -345,7 +345,7 @@ def parse_args():
     parser.add_argument("--dataset_root", type=str, default="dataset")
     parser.add_argument("--dataset", type=str, default="ogbn-products")
     parser.add_argument("--skip_partition", action="store_true")
-    parser.add_argument("--wg_mem_type", type=str, default="chunked")
+    parser.add_argument("--wg_mem_type", type=str, default="distributed")
 
     return parser.parse_args()