Reinstate recursion limit CLI option

This commit adds a CLI option for setting
the recursion limit. This option was originally
removed because it was considered unnecessary,
but in some cases of very large (enormous) networks,
a RecursionError is encountered during graph traversal.
A simple solution for issues like those is to manually
increase the recursion limit.

Signed-off-by: Dwight Lidman <dwight.lidman@arm.com>
Change-Id: Id0dbf68edf59b151abfa91783b5f8f021c1bb40f
diff --git a/ethosu/vela/vela.py b/ethosu/vela/vela.py
index b8a3b9f..9e237f8 100644
--- a/ethosu/vela/vela.py
+++ b/ethosu/vela/vela.py
@@ -398,6 +398,12 @@
                 " operator inputs and outputs (default: %(default)s)"
             ),
         )
+        parser.add_argument(
+            "--recursion-limit",
+            type=int,
+            default=1000,
+            help="Set the recursion depth limit, may result in RecursionError if too low (default: %(default)s)",
+        )
         args = parser.parse_args(args=args)
 
         # Generate the supported ops report and exit
@@ -431,6 +437,8 @@
                 if v.startswith("verbose") and v != "verbose_all":
                     setattr(args, v, True)
 
+        sys.setrecursionlimit(args.recursion_limit)
+
         arch = architecture_features.ArchitectureFeatures(
             vela_config_files=args.config,
             system_config=args.system_config,