public object?DecodeValue(PredictorColumnBase column, List <PredictorCodification> codifications, float[] outputValues, PredictionOptions options)
{
PredictorCodification cod = codifications.SingleEx();
float value = outputValues[cod.Index];
return(DecodeSingleValue(value, cod));
}
public static object?GetDefaultValue(PredictorCodification c)
{
switch (c.Column.NullHandling)
{
case PredictorColumnNullHandling.Zero: return(c.Column.Token.Type.IsClass || c.Column.Token.Type.IsInterface ? null : Zero);
case PredictorColumnNullHandling.Error: throw new Exception($"Null found on {c.Column.Token} of {(c.Column is PredictorColumnSubQuery pcsq ? pcsq.SubQuery.ToString() : "MainQuery")}");
case PredictorColumnNullHandling.Average: return(c.Average);
case PredictorColumnNullHandling.Min: return(c.Min);
case PredictorColumnNullHandling.Max: return(c.Max);
default: throw new UnexpectedValueException(c.Column.NullHandling);
}
}
public override object?DecodeSingleValue(float value, PredictorCodification c)
{
var newValue = (float)Math.Exp((double)value);
return(ReflectionTools.ChangeType(newValue, c.Column.Token.Type));
}
public override float EncodeSingleValue(object?value, PredictorCodification c)
{
var dValue = Convert.ToDouble(value);
return(dValue <= 0 ? MinLog : Math.Max(MinLog, (float)Math.Log(dValue)));
}
public override object?DecodeSingleValue(float value, PredictorCodification c)
{
var newValue = c.Min !.Value + ((c.Max !.Value - c.Min.Value) * value);
return(ReflectionTools.ChangeType(newValue, c.Column.Token.Type));
}
public override float EncodeSingleValue(object?value, PredictorCodification c)
{
return((Convert.ToSingle(value) - c.Min !.Value) / (c.Max !.Value - c.Min !.Value));
}
public override object?DecodeSingleValue(float value, PredictorCodification c)
{
var newValue = c.Average !+(c.StdDev !*value);
return(ReflectionTools.ChangeType(newValue, c.Column.Token.Type));
}
public override float EncodeSingleValue(object?value, PredictorCodification c)
{
return((Convert.ToSingle(value) - c.Average !.Value) / c.StdDev !.Value);
}
public abstract object?DecodeSingleValue(float value, PredictorCodification c);
public void EncodeValue(object?value, PredictorColumnBase column, List <PredictorCodification> codifications, float[] inputValues, int offset)
{
PredictorCodification c = codifications.SingleEx();
inputValues[offset + c.Index] = EncodeSingleValue(value, c);
}
public abstract float EncodeSingleValue(object?valueDefault, PredictorCodification c);
