code: def forward(self, rays_d: torch.Tensor) -> torch.Tensor:
      background = self.background.to(rays_d)
      return background.expand(rays_d.shape[0], -1)
  
imports: from typing import Tuple
  import torch
  import torch.nn
label_desc: Use image node_id 2 for calling the StaticBackground obj's underlying member method code with example usage: obj.forward(rays_d) and returns: background