Onehot encoding

One of k encoding on an array of lenght k

hash encoding

label encoding

• non-linear tree-based
• not increase dimensionality

count encoding

target encoding

encode categorical variables by their ratio of target

reducing dimensonality

https://medium.com/towards-data-science/reducing-dimensionality-from-dimensionality-reduction-techniques-f658aec24dfe

• PCA
• t-SNE
• Auto Encoders