code: def configuration(parent_package="", top_path=None):
      from numpy.distutils.misc_util import Configuration
  
      config = Configuration("signal", parent_package, top_path)
  
      config.add_data_dir("tests")
  
      config.add_subpackage("windows")
  
      config.add_extension(
          "sigtools",
          sources=[
              "sigtoolsmodule.c",
              "firfilter.c",
              "medianfilter.c",
              "lfilter.c.src",
              "correlate_nd.c.src",
          ],
          depends=["sigtools.h"],
          include_dirs=["."],
          **numpy_nodepr_api,
      )
  
      config.add_extension("_spectral", sources=["_spectral.c"])
      config.add_extension(
          "_max_len_seq_inner", sources=["_max_len_seq_inner.c"]
      )
      config.add_extension(
          "_peak_finding_utils", sources=["_peak_finding_utils.c"]
      )
      config.add_extension(
          "_upfirdn_apply", sources=["_upfirdn_apply.c"]
      )
      spline_src = [
          "splinemodule.c",
          "S_bspline_util.c",
          "D_bspline_util.c",
          "C_bspline_util.c",
          "Z_bspline_util.c",
          "bspline_util.c",
      ]
      config.add_extension(
          "spline", sources=spline_src, **numpy_nodepr_api
      )
  
      return config
  
label_desc: Use image node_id 1 for calling a global function with example usage: configuration(parent_package, top_path) and returns: config