add assert of BatchSampler (#53778)

python/paddle/io/dataloader/batch_sampler.py

@@ -133,6 +133,11 @@ class BatchSampler(Sampler):
         ), "batch_size should be a positive integer, but got {}".format(
             batch_size
         )
+        assert batch_size <= len(
+            self.sampler
+        ), "batch_size should not bigger than num of samples, but got {}".format(
+            batch_size
+        )
         self.batch_size = batch_size
         assert isinstance(
             drop_last, bool