link params across instances

Author: poplarShift

utils/param.py

@@ -0,0 +1,11 @@
+def watch_param_across_instances(origin, origin_param, target, target_param):
+    """
+    Have value of target_param on instance param update to value origin_param on instance param.
+    """
+    def callback(*events):
+        for event in events:
+            setattr(target, target_param, event.new)
+
+    watcher = origin.param.watch(callback, [origin_param], onlychanged=False)
+    origin.param.trigger(origin_param)
+    return watcher