fix xpu gather for unified ckpt (#8710)

Author: FeixLiu

paddlenlp/trainer/plugins/unified_checkpoint.py

@@ -41,7 +41,7 @@
     get_checkpoint_shard_files,
     is_safetensors_available,
 )
-from paddlenlp.utils.distributed import distributed_gather
+from paddlenlp.utils.distributed import distributed_allgather, distributed_gather
 from paddlenlp.utils.env import (
     LORA_WEIGHTS_NAME,
     PADDLE_MASTER_WEIGHTS_INDEX_NAME,
@@ -64,6 +64,7 @@
 )
 from paddlenlp.utils.log import logger
 from paddlenlp.utils.nested import nested_copy, nested_copy_place
+from paddlenlp.utils.tools import get_env_device
 
 if is_safetensors_available():
     # from safetensors import safe_open
@@ -1753,7 +1754,10 @@ def merge_tensor_parallel_with_shard(state_dict, tp_actions, all_filter_keys):
             key = filter_keys[i]
             tensor = state_dict[key]
             if key in tp_actions:
-                ret = distributed_gather(tensor, dst=j, group=tp_group, offload=False)
+                if get_env_device() == "xpu":
+                    ret = distributed_allgather(tensor, group=tp_group, offload=False)
+                else:
+                    ret = distributed_gather(tensor, dst=j, group=tp_group, offload=False)
                 action = tp_actions.pop(key)
                 tensor = action(ret) if is_dst else None
             else:
@@ -1790,7 +1794,10 @@ def merge_tensor_parallel_for_optimizer(state_dict, tp_actions, all_filter_keys)
                 if tensor.numel().item() == 1:
                     tensor = tensor._copy_to(DEST_PLACE, False) if is_dst else None  # Need broadcast when loaded
                 else:
-                    ret = distributed_gather(tensor, dst=j, group=tp_group, offload=False)
+                    if get_env_device() == "xpu":
+                        ret = distributed_allgather(tensor, group=tp_group, offload=False)
+                    else:
+                        ret = distributed_gather(tensor, dst=j, group=tp_group, offload=False)
                     action = tp_actions[model_key]
                     tensor = action(ret) if is_dst else None
             else: