The training of a Machine Learning or Artificial Intelligence algorithm without using any labeled or classified information is called unsupervised Learning. Unsupervised Learning allows an algorithm to act upon the given information without any prior guidance and yield results. It is a type of Machine Learning techniques which finds patterns in data. Data that is provided to the unsupervised algorithm is not labeled which means input variables are given without any corresponding output variables.
Unsupervised Learning allows the algorithms to search for interesting patterns or structures in the data on their own. These are called unsupervised learning algorithms because unlike supervised learning algorithms, there is no supervising or teaching information present to guide the machine through data to produce output. Algorithms are left on their own to guide their way to the patterns or interesting structures present in the data.
In unsupervised machine learning training in Hyderabad, an AI system may form groups of unsorted data on the basis of similarities and differences in them even if there are no categories provided earlier. Generative Learning Models are often associated with the AI systems capable of unsupervised learning. Though such systems may also use a retrieval- based approach. Clustering, Anomaly Detection, Association Mining, and Latent Variable Models are some of the applications of Unsupervised Learning techniques.
However, Cluster Analysis is considered to be the most common unsupervised learning method, which is used for investigative data analysis to locate any hidden patterns or groupings in the given data. The most common clustering algorithms are:
- Hierarchical clustering: A multilevel hierarchy of clusters are built by creating a cluster tree.
- K-Means clustering: Data is partitioned into k distinct clusters based on their distance from the centroid of a cluster.
- Gaussian mixture models: Clusters are modeled as a mixture of multivariate normal density components.
- Self-organizing maps: Imply the usage of neural networks that learn the topology and distribution of the data.
- Hidden Markov models: Imply the usage of observed data for recovering the sequence of states.
Though unsupervised learning systems are more unpredictable than supervised learning systems unsupervised Learning algorithms are capable of performing more complex processing tasks than supervised learning algorithms. Bioinformatics uses unsupervised learning methods for sequence analysis and genetic clustering. These algorithms are further used in data mining for sequence and pattern mining, in computer vision for object recognition and in medical imaging for image segmentation.