Stackless yashful

PiperOrigin-RevId: 681582933

kfac_jax/_src/utils/parallel.py

@@ -35,15 +35,7 @@ def in_pmap(axis_name: str | None) -> bool:
   if axis_name is None:
     return False
 
-  try:
-    # The only way to know if we are under `jax.pmap` is to check if the
-    # function call below raises a `NameError` or not.
-    core.axis_frame(axis_name)
-
-    return True
-
-  except NameError:
-    return False
+  return axis_name in core.unsafe_get_axis_names_DO_NOT_USE()
 
 
 def wrap_if_pmap(