Creation of new features from existing data
Selection of relevant features for the model
Handling missing values
Handling categorical data
Normalization and scaling
Encoding categorical variables
Polynomial features
Log transformations
Date-time feature extraction
Domain-specific transformations
Dimensionality reduction techniques
Text feature extraction
Image feature extraction
Feature crossing
Feature splitting
Handling outliers
Feature discretization
Sequence feature extraction
Time-series feature extraction
Feature standardization
Feature normalization
Filter methods
Wrapper methods
Embedded methods
Univariate feature selection
Recursive feature elimination (RFE)
Feature importance from models
L1 regularization (Lasso)
L2 regularization (Ridge)
Variance thresholding
Mutual information
Chi-square test
Correlation matrix
Principal component analysis (PCA)
Feature selection with cross-validation
Sequential feature selection
Information gain
Gain ratio
SelectFromModel
SelectKBest
SelectPercentile