TimeSeriesCatalog.LocalizeRootCause Metode

Definisi

Ruang nama:

Microsoft.ML

Rakitan:

Microsoft.ML.TimeSeries.dll

Paket:

Microsoft.ML.TimeSeries v2.0.0

Buat RootCause, yang melokalisasi akar penyebab menggunakan algoritma pohon keputusan.

public static Microsoft.ML.TimeSeries.RootCause LocalizeRootCause (this Microsoft.ML.AnomalyDetectionCatalog catalog, Microsoft.ML.TimeSeries.RootCauseLocalizationInput src, double beta = 0.3, double rootCauseThreshold = 0.95);

static member LocalizeRootCause : Microsoft.ML.AnomalyDetectionCatalog * Microsoft.ML.TimeSeries.RootCauseLocalizationInput * double * double -> Microsoft.ML.TimeSeries.RootCause

<Extension()>
Public Function LocalizeRootCause (catalog As AnomalyDetectionCatalog, src As RootCauseLocalizationInput, Optional beta As Double = 0.3, Optional rootCauseThreshold As Double = 0.95) As RootCause

Parameter

catalog

AnomalyDetectionCatalog

Katalog deteksi anomali.

src

RootCauseLocalizationInput

Input akar penyebab. Data adalah instans dari RootCauseLocalizationInput.

beta

Double

Beta adalah parameter bobot untuk dipilih pengguna. Ini digunakan ketika skor dihitung untuk setiap item akar penyebab. Rentang beta harus dalam [0,1]. Untuk beta yang lebih besar, item akar penyebab yang memiliki perbedaan besar antara nilai dan nilai yang diharapkan akan mendapatkan skor tinggi. Untuk beta kecil, item akar penyebab yang memiliki perubahan relatif tinggi akan mendapatkan skor rendah.

rootCauseThreshold

Double

Ambang batas untuk menentukan apakah titik tersebut harus menjadi akar penyebabnya. Rentang ambang batas ini harus dalam [0,1]. Jika delta titik sama dengan atau lebih besar dari rootCauseThreshold dikalikan dengan delta titik dimensi anomali, titik ini diperlakukan sebagai akar penyebabnya. Ambang yang berbeda akan menghasilkan hasil yang berbeda. Pengguna dapat memilih delta sesuai dengan data dan persyaratan mereka.

Mengembalikan

RootCause

Contoh

using System;
using System.Collections.Generic;
using Microsoft.ML;
using Microsoft.ML.TimeSeries;

namespace Samples.Dynamic
{
    public static class LocalizeRootCause
    {
        // In the root cause detection input, this string identifies an aggregation as opposed to a dimension value"
        private static string AGG_SYMBOL = "##SUM##";
        public static void Example()
        {
            // Create a new ML context, for ML.NET operations. It can be used for
            // exception tracking and logging, as well as the source of randomness.
            var mlContext = new MLContext();

            // Create an root cause localization input instance.
            DateTime timestamp = GetTimestamp();
            var data = new RootCauseLocalizationInput(timestamp, GetAnomalyDimension(), new List<MetricSlice>() { new MetricSlice(timestamp, GetPoints()) }, AggregateType.Sum, AGG_SYMBOL);

            // Get the root cause localization result.
            RootCause prediction = mlContext.AnomalyDetection.LocalizeRootCause(data);

            // Print the localization result.
            int count = 0;
            foreach (RootCauseItem item in prediction.Items)
            {
                count++;
                Console.WriteLine($"Root cause item #{count} ...");
                Console.WriteLine($"Score: {item.Score}, Path: {String.Join(" ", item.Path)}, Direction: {item.Direction}, Dimension:{String.Join(" ", item.Dimension)}");
            }

            //Item #1 ...
            //Score: 0.26670448876705927, Path: DataCenter, Direction: Up, Dimension:[Country, UK] [DeviceType, ##SUM##] [DataCenter, DC1]
        }

        private static List<TimeSeriesPoint> GetPoints()
        {
            List<TimeSeriesPoint> points = new List<TimeSeriesPoint>();

            Dictionary<string, Object> dic1 = new Dictionary<string, Object>();
            dic1.Add("Country", "UK");
            dic1.Add("DeviceType", "Laptop");
            dic1.Add("DataCenter", "DC1");
            points.Add(new TimeSeriesPoint(200, 100, true, dic1));

            Dictionary<string, Object> dic2 = new Dictionary<string, Object>();
            dic2.Add("Country", "UK");
            dic2.Add("DeviceType", "Mobile");
            dic2.Add("DataCenter", "DC1");
            points.Add(new TimeSeriesPoint(1000, 100, true, dic2));

            Dictionary<string, Object> dic3 = new Dictionary<string, Object>();
            dic3.Add("Country", "UK");
            dic3.Add("DeviceType", AGG_SYMBOL);
            dic3.Add("DataCenter", "DC1");
            points.Add(new TimeSeriesPoint(1200, 200, true, dic3));

            Dictionary<string, Object> dic4 = new Dictionary<string, Object>();
            dic4.Add("Country", "UK");
            dic4.Add("DeviceType", "Laptop");
            dic4.Add("DataCenter", "DC2");
            points.Add(new TimeSeriesPoint(100, 100, false, dic4));

            Dictionary<string, Object> dic5 = new Dictionary<string, Object>();
            dic5.Add("Country", "UK");
            dic5.Add("DeviceType", "Mobile");
            dic5.Add("DataCenter", "DC2");
            points.Add(new TimeSeriesPoint(200, 200, false, dic5));

            Dictionary<string, Object> dic6 = new Dictionary<string, Object>();
            dic6.Add("Country", "UK");
            dic6.Add("DeviceType", AGG_SYMBOL);
            dic6.Add("DataCenter", "DC2");
            points.Add(new TimeSeriesPoint(300, 300, false, dic6));

            Dictionary<string, Object> dic7 = new Dictionary<string, Object>();
            dic7.Add("Country", "UK");
            dic7.Add("DeviceType", AGG_SYMBOL);
            dic7.Add("DataCenter", AGG_SYMBOL);
            points.Add(new TimeSeriesPoint(1500, 500, true, dic7));

            Dictionary<string, Object> dic8 = new Dictionary<string, Object>();
            dic8.Add("Country", "UK");
            dic8.Add("DeviceType", "Laptop");
            dic8.Add("DataCenter", AGG_SYMBOL);
            points.Add(new TimeSeriesPoint(300, 200, true, dic8));

            Dictionary<string, Object> dic9 = new Dictionary<string, Object>();
            dic9.Add("Country", "UK");
            dic9.Add("DeviceType", "Mobile");
            dic9.Add("DataCenter", AGG_SYMBOL);
            points.Add(new TimeSeriesPoint(1200, 300, true, dic9));

            return points;
        }

        private static Dictionary<string, Object> GetAnomalyDimension()
        {
            Dictionary<string, Object> dim = new Dictionary<string, Object>();
            dim.Add("Country", "UK");
            dim.Add("DeviceType", AGG_SYMBOL);
            dim.Add("DataCenter", AGG_SYMBOL);

            return dim;
        }

        private static DateTime GetTimestamp()
        {
            return new DateTime(2020, 3, 23, 0, 0, 0);
        }
    }
}