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Enterprise AI

Anomaly Detection and Monitoring Using Deep Learning

Dr. Jagreet Kaur Gill | 24 April 2017

Getting Started with Anomaly Detection

Anomaly detection is the identification of data points, items, observations or situations that do not correspond to the familiar pattern of a given group. Certain anomalies happen very rarely but may imply a large and significant threat such as cyber intrusions or fraud in the field of IT infrastructure. Anomaly detection is used for behavioral analysis and other forms of analysis in order to serve in learning about the detection, identification, and prediction of the phenomenon of these anomalies. Let's take a look at below points to under the uses of anomaly detection in different fields.
  • Anomaly Detection identifies any unusual behavior or pattern in a dataset, used in many applications like Fraud Detection in Banking Sector, Pattern Analysis of Network Traffic, Predictive Maintenance, and Monitoring.
  • Offering AI-powered Log Analytics solutions for Anomaly Detection, finding a correlation between anomalies and predicting anomaly in the IT Infrastructure using Machine Learning and Deep Learning.

Challenge for Building Anomaly Detection System

  • Extensive usage of data growth on a daily basis with the evolution of technology.
  • Increased occurrence of unusual behavior or fraud activities.
  • Need for detection promptly to perform maintenance and achieve monitoring effectively.

Solution for Building Anomaly Detection System with Deep Learning

Guide to Data Preprocessing

Load dataset, store in the object and check datatype of the dataset and convert into float values. After conversion, calculate the total number of hours from date and time and converted dataset loaded as a series.

Overview of Data Wrangling

Plot and visualize time series data. To get the values of AR, I and MA plotting of autocorrelation and description of residuals are necessary.

Understanding Model Implementation

Implement the ARIMA model and predict values obtained and calculate forecast errors. Calculate the mean and standard deviation of the dataset, and compute the anomalies.

Complete Guide to Anomaly Detection Techniques

Anomaly Detection refers to the identification of the events that don't agree to the patterns present in a dataset leading to defects, errors or faults. Anomaly Detection with Machine Learning algorithms detects and classify the anomalies and make predictions from the data. Two majorly classified techniques involve -
  • Unsupervised Machine Learning for Anomaly Detection
  • Supervised Machine Learning for Anomaly Detection

Unsupervised Machine Learning for Anomaly Detection

In unsupervised, all data is unlabeled, and the algorithms learn to integrate structure from the input data. Unsupervised Detection does not require training data assuming network connections of normal traffic, as well as malicious traffic, differs from the normal traffic. By these conditions, data of similar instances considered as error-free and of different patterns regarded as malicious. Some of unsupervised Machine Learning algorithms involve K-Means, Self-Organising Maps(SOM), Apriori algorithm.

Supervised Machine Learning for Anomaly Detection

In supervised, all data labeled and the algorithms learn to predict the output from the input data. Supervised Detection requires a labeled training set containing normal and abnormal data. Supervised detection uses a combination with statistical schemes, including the capability of encoding interdependencies between variables and predicting events. Moreover, incorporates both prior knowledge and data. Supervised Machine Learning algorithms involve Support Vector Machine Learning, Bayesian Networks, Decision Trees, K-NN.
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