fix slowfast interface bug caused by the movement of hapi dir (#4834)

Author: huangjun12

dygraph/slowfast/eval.py

@@ -20,8 +20,8 @@
 import numpy as np
 import paddle.fluid as fluid
 from paddle.fluid.dygraph.base import to_variable
-from paddle.io import DataLoader, Dataset
-from paddle.incubate.hapi.distributed import DistributedBatchSampler, _all_gather
+from paddle.io import DataLoader, Dataset, DistributedBatchSampler
+from paddle.hapi.model import _all_gather
 from paddle.fluid.dygraph.parallel import ParallelEnv
 
 from model import *

dygraph/slowfast/predict.py

@@ -21,8 +21,8 @@
 import json
 import paddle.fluid as fluid
 from paddle.fluid.dygraph.base import to_variable
-from paddle.io import DataLoader, Dataset
-from paddle.incubate.hapi.distributed import DistributedBatchSampler, _all_gather
+from paddle.io import DataLoader, Dataset, DistributedBatchSampler
+from paddle.hapi.model import _all_gather
 from paddle.fluid.dygraph.parallel import ParallelEnv
 
 from model import *

dygraph/slowfast/train.py

@@ -24,8 +24,7 @@
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid.dygraph.base import to_variable
-from paddle.io import DataLoader, Dataset
-from paddle.incubate.hapi.distributed import DistributedBatchSampler
+from paddle.io import DataLoader, Dataset, DistributedBatchSampler
 
 from model import *
 from config_utils import *