code: def _oncofuse_tissue_arg_from_config(data):
  
      
      SUPPORTED_TISSUE_TYPE = ["EPI", "HEM", "MES", "AVG"]
      tissue_type = tz.get_in(("metadata", "tissue"), data, None)
      if not tissue_type:
          logger.info("Oncofuse: tissue type not set, using average expression (AVG).")
          tissue_type = "AVG"
      elif tissue_type not in SUPPORTED_TISSUE_TYPE:
          logger.info("Oncofuse: %s not a supported tissue type, using average "
                      "expression (AVG)." % tissue_type)
          tissue_type = "AVG"
      else:
          logger.info("Oncofuse: using %s as tissue type." % tissue_type)
      return tissue_type
docs: Retrieve oncofuse arguments supplied through input configuration.
      tissue_type is the library argument, which tells Oncofuse to use its
      own pre-built gene expression libraries. There are four pre-built
      libraries, corresponding to the four supported tissue types:
      EPI (epithelial origin),
      HEM (hematological origin),
      MES (mesenchymal origin) and
      AVG (average expression, if tissue source is unknown).