code: def test_init(self):
      with self.assertRaises(AssertionError):
          CoarseMaskHead(num_fcs=0)
  
      with self.assertRaises(AssertionError):
          CoarseMaskHead(downsample_factor=0.5)
  
imports: import unittest
  import torch
  from parameterized import parameterized
  from mmdet.models.roi_heads.mask_heads import CoarseMaskHead
label_desc: Use image node_id 1 for calling the TestCoarseMaskHead obj's underlying member method code with example usage: obj.test_init() without return types