class_docstr: Bottleneck block with residual
class_docstr_tok: ["Bottleneck","block","with","residual"]
code: def forward(self, x):
      out = self.block(x)
      if self.downsample:
          out += self.downsample(x)
      else:
          out += x
      return out
  
file_path: torch-points3d/torch_points3d/modules/SparseConv3d/modules.py
imports: import torch
  import sys
  from torch_points3d.core.common_modules import Seq, Identity
  import torch_points3d.modules.SparseConv3d.nn
label_desc: Use image node_id 2 for calling the BottleneckBlock obj's underlying member method code with example usage: obj.forward(x) and returns: out