feat: list all registered schedulers (#1009)

Author: azzhipa

torchx/schedulers/__init__.py

@@ -51,16 +51,16 @@ def get_scheduler_factories(
 
     The first scheduler in the dictionary is used as the default scheduler.
     """
+    valid_schedulers: Dict[str, SchedulerFactory] = {}
+    if not skip_defaults:
+        for scheduler_name, path in DEFAULT_SCHEDULER_MODULES.items():
+            valid_schedulers[scheduler_name] = _defer_load_scheduler(path)
 
-    default_schedulers: Dict[str, SchedulerFactory] = {}
-    for scheduler, path in DEFAULT_SCHEDULER_MODULES.items():
-        default_schedulers[scheduler] = _defer_load_scheduler(path)
+    entry_point_schedulers = load_group(group, default=None, skip_defaults=True)
+    if entry_point_schedulers:
+        valid_schedulers.update(entry_point_schedulers)
 
-    return load_group(
-        group,
-        default=default_schedulers,
-        skip_defaults=skip_defaults,
-    )
+    return valid_schedulers
 
 
 def get_default_scheduler_name() -> str: