code: def test_init(self):
      return MAEDecoder(
          seq_length=50,
          num_layers=2,
          num_heads=4,
          embed_input_dim=128,
          hidden_dim=256,
          mlp_dim=256 * 4,
          out_dim=3 * 32**2,
      )
  
imports: import unittest
  import torch
  import torchvision
  from lightly import _torchvision_vit_available
  from lightly.models import utils
label_desc: Use image node_id 1 for calling the TestMAEDecoder obj's underlying member method code with example usage: obj.test_init() and returns: MAEDecoder