Update modeling_ltgbert.py

Fixing error in the re-bucketing for the Attention module

modeling_ltgbert.py

@@ -209,7 +209,7 @@ class Attention(nn.Module):
         if self.position_indices.size(0) < query_len:
             position_indices = torch.arange(query_len, dtype=torch.long).unsqueeze(1) \
                 - torch.arange(query_len, dtype=torch.long).unsqueeze(0)
-            position_indices = self.make_log_bucket_position(position_indices, self.position_bucket_size, 512)
+            position_indices = self.make_log_bucket_position(position_indices, self.config.position_bucket_size, 512)
             position_indices = self.position_bucket_size - 1 + position_indices
             self.position_indices = position_indices.to(hidden_states.device)