[AnomalyDetection] Some points marked as anomaly with little deviation

[lisahua]

System information

• OS version/distro:
• .NET Version (eg., dotnet --info): master

Issue

• What did you do? Apply AnomalyDetection API
• What happened? Some points are marked as anomaly while some others that look more like anomaly are not marked as anomaly.
• What did you expect? I expect the points that look has more deviations mark as anomaly, rather than the ones with small deviation.

Expecting the highlighted points with higher deviation to be anomalies.

Please assign the issue to: https://github.com/guinao and https://github.com/mengaims

Source code / logs

       var anomalyDetectorOptions = new SrCnnEntireAnomalyDetectorOptions()
        {
            DetectMode = //WithMargin,
            Sensitivity = 20,
            DeseasonalityMode = SrCnnDeseasonalityMode.Median,
            Period = -1,
            Threshold =0.18,
        };

        anomalyResult = this.mlContext.AnomalyDetection.DetectEntireAnomalyBySrCnn(
  ...
        anomalyDetectorOptions);

[michaelgsharp]

@guinao can you take a look at this? It is probably related to #5630 as well.

[michaelgsharp]

Re-uploading csv file Sales Profit by Year, Quarter, Month and Day.csv