code: def create_batch_siamese(pair, batch):
      """
      create a batch with siamese input
      """
      return 2 * batch + pair
  
imports: import logging
  import torch
  import torch.nn.functional
  from typing import Any
  from torch_points3d.datasets.multiscale_data import MultiScaleBatch
  from torch_points3d.models.base_architectures import BackboneBasedModel
  from torch_points3d.models.base_model import BaseModel
  from torch_points3d.core.common_modules.dense_modules import Conv1D
  from torch_points3d.core.common_modules.base_modules import Seq
label_desc: Use image node_id 1 for calling a global function with example usage: create_batch_siamese(pair, batch) and returns: unknown