code: def _build_kernel(self, kernel_source, compile_flags=()):
          
          return cl.Program(self._cl_context, kernel_source).build(' '.join(compile_flags))
docs: Convenience function for building the kernel for this worker.
  
          Args:
              kernel_source (str): the kernel source to use for building the kernel
  
          Returns:
              cl.Program: a compiled CL kernel