Several machine learning techniques include distance measures as a significant component. These distance metrics are used to calculate the similarity between data points in both supervised and unsupervised learning.
When there is a lot of dimensionality in the data, the Manhattan distance is frequently preferred over the more common Euclidean distance. The Hamming distance metric is used to identify the level of similarity between two data points, whereas the Cosine distance metric is used to find the distance between categorical variables.
The most used Distance metrics in Machine learning are:
The Euclidean distance is the default distance measure in most clustering applications. Other dissimilarity metrics may be preferred depending on the type of data and the researcher's questions. In gene expression data analysis, for example, correlation-based distance is frequently utilised.
A distance function calculates the distance between set items. If the distance between elements is zero, they are equivalent; otherwise, they are not. Distance metrics employ a mathematical formula called a distance function. Various distance measures have different distance functions.