code: def forward(self, x):
      b, c, h, w = x.size()
      x = x.unsqueeze(-1).unsqueeze(3)
      x = x.repeat(1, 1, 1, self.y_scale, 1, self.x_scale)
      return x.view(b, c, h * self.y_scale, w * self.x_scale)
  
imports: import sys
  import torch
  import torch.nn
  import numpy
  import torch.nn.functional
  import time
  from TTS.utils.audio import AudioProcessor
  from TTS.vocoder.utils.distribution import sample_from_gaussian, sample_from_discretized_mix_logistic
label_desc: Use image node_id 2 for calling the Stretch2d obj's underlying member method code with example usage: obj.forward(x) and returns: x