Dimension Reduction Techniques with Python

Why Do We Need to Reduce the Dimensionality? A high-dimensional dataset is a dataset that has a great number of columns (or variables). Such a dataset presents many mathematical or computational challenges. The good news is that variables (or called features) are often correlated. We can find a subset of the variables to represent the same level of information in the data, or transform the variables to a new set of variables without losing much information.