fix(pytest/windows/impertive): fix impertive pytest failed on windows

GitOrigin-RevId: 02f4c0a0be0be4a4e88ddc26363b19f3469bd4d5

imperative/python/megengine/data/dataloader.py

@@ -9,6 +9,7 @@
 import collections
 import math
 import multiprocessing
+import platform
 import queue
 import random
 import time
@@ -113,6 +114,11 @@ class DataLoader:
         self.__initialized = True
 
     def __iter__(self):
+        if platform.system() == "Windows":
+            print(
+                "pyarrow.plasma does not support ParallelDataLoader on windows, changing num_workers to be zero"
+            )
+            self.num_workers = 0
         if self.num_workers == 0:
             return _SerialDataLoaderIter(self)
         else:

imperative/python/test/unit/data/test_dataloader.py

@@ -7,6 +7,7 @@
 # software distributed under the License is distributed on an
 # "AS IS" BASIS, WITHOUT ARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 import os
+import platform
 import time
 
 import numpy as np
@@ -89,6 +90,10 @@ def test_dataloader_parallel():
         assert label.shape == (4,)
 
 
+@pytest.mark.skipif(
+    platform.system() == "Windows",
+    reason="dataloader do not support parallel on windows",
+)
 def test_dataloader_parallel_timeout():
     dataset = init_dataset()
 
@@ -112,6 +117,10 @@ def test_dataloader_parallel_timeout():
         batch_data = next(data_iter)
 
 
+@pytest.mark.skipif(
+    platform.system() == "Windows",
+    reason="dataloader do not support parallel on windows",
+)
 def test_dataloader_parallel_worker_exception():
     dataset = init_dataset()