code: def forward(self, x, film_camera_emb=None, N_views_xa=1):
      x = self.encoder(
          x, film_camera_emb=film_camera_emb, N_views_xa=N_views_xa
      )
  
      return self.out(x)
  
imports: import torch
  import torch.nn
  import torchvision
  import numpy
  import torch
  from torch.nn.functional import silu
  from einops import rearrange, repeat
  from utils.general_utils import matrix_to_quaternion, quaternion_raw_multiply
  from utils.graphics_utils import fov2focal
label_desc: Use image node_id 2 for calling the SingleImageSongUNetPredictor obj's underlying member method code with example usage: obj.forward(x, film_camera_emb, N_views_xa) and returns: self