[Fix] Fix cylinder3d (#2377)

* mv cylinder blocks from sparse blocks to backbone

* update

Author: xizaoqu

configs/cylinder3d/cylinder3d_4xb2_3x_semantickitti.py renamed to configs/cylinder3d/cylinder3d_4xb4_3x_semantickitti.py

@@ -28,6 +28,8 @@
         gamma=0.1)
 ]
 
+train_dataloader = dict(batch_size=4, )
+
 # Default setting for scaling LR automatically
 #   - `enable` means enable scaling LR automatically
 #       or not by default.