code: def sources_files(self):
      ret = [
          self.csrc_abs_path(fname)
          for fname in [
              "layer_norm_cuda.cpp",
              "layer_norm_cuda_kernel.cu",
          ]
      ]
      return ret
  
file_path: ColossalAI/op_builder/layernorm.py
imports: from .builder import Builder
  from .utils import append_nvcc_threads, get_cuda_cc_flag
label_desc: Use image node_id 2 for calling the LayerNormBuilder obj's underlying member method code with example usage: obj.sources_files() and returns: ret