fix pyright

tests/data/test_icl_datasets.py

@@ -37,7 +37,7 @@ def run_test(
     for i, e in enumerate(evaluators):
         batch = next(e.dataloader.dataloader.__iter__())
         # Check that the dataloader is the correct length for the first task.
-        if i == 0:
+        if i == 0 and hasattr(e.dataloader.dataloader, '__len__'):
             if eval_drop_last:
                 assert len(
                     e.dataloader.dataloader,