code: def test_init(self):
      with self.assertRaises(AssertionError):
          DBHead(in_channels="test", with_bias=False)
  
      with self.assertRaises(AssertionError):
          DBHead(in_channels=1, with_bias="Text")
  
file_path: mmocr/tests/test_models/test_textdet/test_heads/test_db_head.py
imports: from unittest import TestCase
  import torch
  from mmocr.models.textdet.heads import DBHead
  from mmocr.registry import MODELS
label_desc: Use image node_id 2 for calling the TestDBHead obj's underlying member method code with example usage: obj.test_init() without return types