[Fix] Minor fix (#1183)

Author: yitianlian

slime/utils/arguments.py

@@ -1579,8 +1579,6 @@ def slime_validate_args(args):
             args.rollout_max_prompt_len <= args.rollout_max_context_len - 1
         ), f"args.rollout_max_prompt_len ({args.rollout_max_prompt_len}) must be smaller than args.rollout_max_context_len ({args.rollout_max_context_len}) so that there is at least one generated token to compute loss."
 
-    if args.prefill_num_servers is not None:
-        assert not args.use_fault_tolerance, "fault tolerance is not supported when prefill_num_servers is set."
     assert not (
         args.prefill_num_servers is not None and args.rollout_external
     ), "prefill_num_servers cannot be set when rollout_external is set."