Fix lint

python/graphstorm/dataloading/dataloading.py

@@ -1291,12 +1291,6 @@ def fanout(self):
         """
         return self._fanout
 
-    def __len__(self):
-        num_samples = 0
-        for _, test_size in self._fixed_test_size.items():
-            num_samples += math.ceil(test_size // self._batch_size)
-        return num_samples
-
 class GSgnnLinkPredictionJointTestDataLoader(GSgnnLinkPredictionTestDataLoader):
     """ Link prediction minibatch dataloader for validation and test
         with joint negative sampler