public void Visit <T1>(RandomPrimitive <T1> erp)
{
if (erp is Constant <T1> )
{
// do not add to trace as we do not want to
// resample constants
this.sample = new Weighted <T1>(erp.Sample(-1));
return;
}
var prev = FindChoice(this.oldTrace, this.stack, erp);
var reuse = prev.HasValue && ((RandomPrimitive)prev.Value.Erp).ForceRegen == false;
if (reuse)
{
var entry = prev.Value;
this.sample = new Weighted <T1>((T1)entry.Sample);
entry.Reused = true;
this.trace.Add(entry);
}
else
{
var sample = erp.Sample(this.generation);
var score = Math.Log(erp.Score(sample));
this.sample = new Weighted <T1>(sample);
var entry = new TraceEntry(this.stack, erp, sample, score, false);
this.trace.Add(entry);
// keep from forcing a regeneration of this RandomPrimitive
// either on this iteration (i.e., because of a programmer
// induced dependence) or in future iterations.
((RandomPrimitive)erp).ForceRegen = false;
}
}
public void Visit <T>(RandomPrimitive <T> erp)
{
this.Sample = erp.Sample(-1);
}
public void Visit <T1>(RandomPrimitive <T1> erp)
{
var sample = erp.Sample(this.generation);
this.sample = new Weighted <T1>(sample);
}