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# Transformations for pre-processing of data

- ## Sampling

- The process of selecting a subset of the available data. Can be applied to continuous time series data such as speech and music.

- ## Discretisation

- Representing continuous-valued data with the use of sub-intervals where the real values lie.

- ## Normalisation

- Moving the scale of the real data into a predefined scale e.g. [0,1]. Can be linear or non-linear.