code: def sources_files(self):
      ret = [
          self.csrc_abs_path(fname)
          for fname in [
              "colossal_C_frontend.cpp",
              "multi_tensor_sgd_kernel.cu",
              "multi_tensor_scale_kernel.cu",
              "multi_tensor_adam.cu",
              "multi_tensor_l2norm_kernel.cu",
              "multi_tensor_lamb.cu",
          ]
      ]
      return ret
  
file_path: colossalai/op_builder/fused_optim.py
imports: from .builder import Builder
  from .utils import get_cuda_cc_flag
label_desc: Use image node_id 2 for calling the FusedOptimBuilder obj's underlying member method code with example usage: obj.sources_files() and returns: ret