code: def forward(self, x):
      pad = (0, 1, 0, 1)
      x = torch.nn.functional.pad(x, pad, mode="constant", value=0)
      x = self.conv(x)
      return x
  
imports: import torch
  import torch.nn
  import torch.nn.functional
  from basicsr.utils import get_root_logger
  from basicsr.utils.registry import ARCH_REGISTRY
label_desc: Use image node_id 2 for calling the Downsample obj's underlying member method code with example usage: obj.forward(x) and returns: x