Isolation forest anomaliyani aniqlash uchun machine learning(ML)

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Isolation forest anomaliyani aniqlash uchun machine learning(ML) algoritmi.

An outlier - is nothing but a data point that differs significantly from other data points in the given dataset.

===========Anomaly Detection Use Cases==========

Anomaly detection has wide applications across industries. Below are some of the popular use cases:

Banking. Finding abnormally high deposits. Every account holder generally has certain patterns of depositing money into their account. If there is an outlier to this pattern the bank needs to be able to detect and analyze it, e.g. for money laundering.

Finance. Soxta sotib olish usulini topish. Every person generally has certain patterns of purchases which they make. If there is an outlier to this pattern the bank needs to detect it in order to analyze it for potential fraud.

Healthcare. Detecting fraudulent insurance claims and payments.

Manufacturing. Abnormal machine behavior can be monitored for cost control. Many companies continuously monitor the input and output parameters of the machines they own. It is a well-known fact that before failure a machine shows abnormal behaviors in terms of these input or output parameters. Mashinani anomal xatti-harakatlarini profilaktika xizmati nuqtai nazaridan doimiy ravishda kuzatib borish kerak.

Networking. Detecting intrusion into networks. Any network exposed to the outside world faces this threat. Intrusions can be detected early on using monitoring for anomalous activity in the network.

What Is Isolation Forest?

Isolation forest is a machine learning algorithm for anomaly detection.

It's an unsupervised learning algorithm that identifies anomaly by isolating outliers in the data.

Isolation Forest is based on the Decision Tree algorithm.

It isolates the outliers by randomly selecting a feature from the given set of features and then randomly selecting a split value between the max and min values of that feature. This random partitioning of features will produce shorter paths in trees for the anomalous data points, thus distinguishing them from the rest of the data.

Using Isolation Forest, we can not only detect anomalies faster but we also require less memory compared to other algorithms.

Anomaly detection is similar to — but not entirely the same as — noise removal and novelty detection.

Novelty detection is concerned with identifying an unobserved pattern in new observations not included in training data like a sudden interest in a new channel on YouTube during Christmas, for instance.

Noise removal (NR) is the process of removing noise from an otherwise meaningful signal.
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