code: def forward(self, x, prev_rgb, istyle, inoise):
      if self.upsample is not None:
          x = self.upsample(x)
  
      inoise = inoise[:, : x.shape[2], : x.shape[3], :]
      noise1 = self.to_noise1(inoise).permute((0, 3, 1, 2))
      noise2 = self.to_noise2(inoise).permute((0, 3, 1, 2))
  
      style1 = self.to_style1(istyle)
      x = self.conv1(x, style1)
      x = self.activation(x + noise1)
  
      style2 = self.to_style2(istyle)
      x = self.conv2(x, style2)
      x = self.activation(x + noise2)
  
      rgb = self.to_rgb(x, prev_rgb, istyle)
      return x, rgb
  
imports: import math
  from functools import partial
  from math import log2
  from typing import List
  import torch
  import torch.nn.functional
  from einops import rearrange
  from kornia.filters import filter2d
  from nemo.collections.tts.parts.utils.helpers import mask_sequence_tensor
label_desc: Use image node_id 2 for calling the GeneratorBlock obj's underlying member method code with example usage: obj.forward(x, prev_rgb, istyle, inoise) and returns: x,  rgb