修改paddle fdl测试用例

tests/core/dataloaders/paddle_dataloader/test_fdl.py

@@ -68,4 +68,26 @@ class TestPaddle:
         collate_fn = Collator(backend='auto')
         paddle_dl = DataLoader(ds, collate_fn=collate_fn)
         for batch in paddle_dl:
+            print(batch)
+
+    def test_v4(self):
+        from paddle.io import DataLoader
+        from fastNLP import Collator
+        from paddle.io import Dataset
+        import paddle
+
+        class PaddleRandomMaxDataset(Dataset):
+            def __init__(self, num_samples, num_features):
+                self.x = paddle.randn((num_samples, num_features))
+                self.y = self.x.argmax(axis=-1)
+
+            def __len__(self):
+                return len(self.x)
+
+            def __getitem__(self, item):
+                return {"x": self.x[item], "y": self.y[item]}
+
+        ds = PaddleRandomMaxDataset(100, 2)
+        dl = DataLoader(ds, places=None, collate_fn=Collator(), batch_size=4)
+        for batch in dl:
             print(batch)