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How to create an empty signal

When a model is trained on repository A and test on repository B, then we might face missing signal. Example:

  • model A: has RDW signal
  • model B: do not have RDW signal  To resolve we adjust the model with the following json 
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    adjust_model --preProcessors add_empty_signal.json --skip_model_apply 1 --learn_rep_proc 0 --inModel ${IN_MODEL} --out ${OUT_MODEL}
      While add_empty_signal.json is: 
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    { "pre_processors" : [
   {
      "action_type": "rp_set",
      "members": [
        {
          "rp_type":"calc_signals",
          "calculator":"empty",
          "names":"RDW",
          "signals":"BDATE" 
      }
      ]
    }
  ]
}