code: def __call__(self, x):
      return x.sequential(self.conv1).sequential(self.conv2)
  
file_path: tinygrad/extra/models/unet3d.py
imports: from pathlib import Path
  import torch
  from tinygrad import nn
  from tinygrad.tensor import Tensor
  from tinygrad.helpers import fetch, get_child
label_desc: Use image node_id 2 for calling the DownsampleBlock obj's underlying member method code with example usage: obj.__call__(x) and returns: x