code: def conv(self, x, pos, edge_index, batch):
      return self._conv(x, pos, edge_index)
  
file_path: torch-points3d/torch_points3d/modules/RSConv/message_passing.py
imports: import torch
  from torch.nn import ReLU
  from torch_geometric.nn import MessagePassing
  from torch_points3d.core.base_conv.message_passing import *
  from torch_points3d.core.spatial_ops import *
label_desc: Use image node_id 2 for calling the RSConvDown obj's underlying member method code with example usage: obj.conv(x, pos, edge_index, batch) and returns: self