code: def test_start_with_digit(self):
      assert not compiler.is_valid_kernel_name("0_invalid")
  
imports: import pickle
  import unittest
  from unittest import mock
  import cupy
  from cupy.cuda import compiler
label_desc: Use image node_id 3 for calling the TestIsValidKernelName obj's underlying member method code with example usage: obj.test_start_with_digit() without return types