How-is-signal-s-Weight-calculated-and-are-signals-sorted-by-weight-before-NSF-are-determined

Please see Weight either in the QuickRef or in online manual:
https://www.wealth-lab.com/Support/ApiReference/Transaction

If my C# code below does not explicitly assign transaction weights, ...

CODE:
   if (dxSmoothed[bar] < 37.0 && vossPredictorVelocityNorm[bar] > vossPredictVelNormThres[bar] //<33.5
      && vossPredictorVelocity[bar] > vossPredictVelThres[bar]
      && dxSmoothed[bar] > dxSmoothedThres[bar] //very predictive, but timing lagging
      && mfoConsecUp[bar] > 0.0
   {
      Transaction t = PlaceTrade(bars, TransactionType.Buy, OrderType.Stop, bars.Close[bar], "Voss predictor buy"); 
      t.SetPositionMetric("merit rank", dxSmoothedThres.MeritRank(bar));
      //t.SetPositionMetric("Voss Predictor Velocity", vossPredictorVelocity[bar]);
   }

... then how does WL assign these weights to the signal column below? Does it simply pick numbers at random for the weights? Or are these weights for something else entirely?

Randomly