code: def depth_concat(model, blobs_in, blob_out, **kwargs):
      """The old depth concat function - we should move to use concat."""
      print("DepthConcat is deprecated. use Concat instead.")
      return concat(blobs_in, blob_out, **kwargs)
  
label_desc: Use image node_id 2 for calling a global function with example usage: depth_concat(model, blobs_in, blob_out) and returns: concat