fix bug of sync_parameters (#33955)

python/paddle/fluid/dygraph/parallel.py

@@ -17,7 +17,10 @@ import six
 import numpy as np
 import warnings
 from collections import OrderedDict
+import itertools
+import warnings
 
+import paddle
 from paddle.fluid import core
 from paddle.fluid import framework
 from paddle.fluid.dygraph import layers
@@ -26,9 +29,7 @@ from paddle.fluid.dygraph import to_variable, no_grad
 from paddle.utils import deprecated
 from ..layers import collective
 from paddle.fluid.dygraph import base as imperative_base
-import warnings
-import paddle
-import itertools
+from paddle.fluid.framework import ParamBase
 
 __all__ = ["prepare_context", "ParallelEnv", "DataParallel"]
 
@@ -353,7 +354,8 @@ def sync_params_buffers(model,
             raise TypeError("The data type of '%s' must be Varbase" %
                             param.name)
         # is_distributed param not need to sync when in mp mode
-        if is_model_parallel and param.is_distributed:
+        if is_model_parallel and isinstance(param, ParamBase):
+            if param.is_distributed:
                 continue
 
         model_vars.append(param.detach())