# Feature Scale

Feature scale is a process that scales each feature along column.
Feature Scale module supports min-max scale and standard scale.

1.  min-max scale: this estimator scales and translates each feature
    individually such that it is in the given range on the training set,
    e.g. between min and max value of each feature.
2.  standard scale: standardize features by removing the mean and
    scaling to unit variance

<!-- mkdocs
## Param

::: federatedml.param.scale_param
    rendering:
      heading_level: 3
      show_source: true
      show_root_heading: true
      show_root_toc_entry: false
      show_root_full_path: false
-->