Changelog

Source: NEWS.md

themis (development version)

• Added a new article explaining how over_ratio and under_ratio work (#141).

• All upsampling steps gain an indicator_column argument. When set, a logical column is added to the baked data marking rows added by the step (TRUE) vs rows from the original data (FALSE). For step_rose(), all rows are TRUE since ROSE generates a fully synthetic dataset (#58).

• step_rose() and rose() now have improved documentation for minority_prop, clarifying that it controls the proportion of synthetic observations from the minority class, and how it differs from over_ratio (#144).

• Added standalone rose() function as a thin wrapper around ROSE::ROSE(), making it consistent with the other algorithms in the package that expose a direct implementation alongside their recipe step (#195).

• step_nearmiss() and step_tomek() gain a distance_with argument to control which variables are used for distance calculations. This allows the steps to be used when non-numeric predictor variables are present in the data (#166).

• step_adasyn(), step_bsmote(), step_nearmiss(), step_smote(), and step_smotenc() now document the minimum number of observations needed to perform the algorithm (#104).

• All step_*() functions now correctly handle 0 and 1 row inputs in bake() (#160).

• adasyn(), bsmote(), nearmiss(), smote(), and tomek() now correctly attribute errors from non-numeric columns to the user-facing function (#181).

• smotenc() now only suppresses the specific benign warning from gower::gower_topn() about variables with zero range, rather than all warnings (#182).

• bsmote() now correctly passes the all_neighbors argument to the underlying implementation (#176).

• step_bsmote() now works correctly when there is only a single predictor (#151).

• step_downsample() and step_upsample() now correctly handle NA values in the outcome variable instead of erroring (#177).

themis 1.0.3

CRAN release: 2025-01-22

Improvements

• Calling ?tidy.step_*() now sends you to the documentation for step_*() where the outcome is documented. (#142)

• Documentation now correctly specifies majority-to-minority and minority-to-majority. (#143, #110)

• Documentation for tidy methods for all steps has been improved to describe the return value more accurately. (#148)

• All messages, warnings and errors has been translated to use {cli} package (#153, #155).

themis 1.0.2

CRAN release: 2023-08-14

Improvements

• Many internal changes to improve consistency and slight speed increases.

themis 1.0.1

CRAN release: 2023-04-14

Improvements

• Fixed bug where some upsampling functions would error if no upsampling was needed. (#119)

• Steps with tunable arguments now have those arguments listed in the documentation.

themis 1.0.0

CRAN release: 2022-07-02

• Added case weights support for step_upsample() and step_downsample()

themis 0.2.2

CRAN release: 2022-05-11

• tomek() has been added, rewritten to apply to multiple classes, removing the need for the unbalanced package, which has been removed as a dependency.

themis 0.2.1

CRAN release: 2022-04-13

• A bug was fixed in step_downsample() and step_upsample() that made the steps unable to be tuned. (#90)

themis 0.2.0

CRAN release: 2022-03-30

New steps

• step_smotenc() have been added to implement SMOTENC which can handle categorical as well as numerical values. Thanks to @RobertGregg (#82)

Improvements and Other Changes

• export nearmiss() functions to users.
• Update examples to no longer use iris or okc data sets.
• All recipe steps now officially support empty selections to be more aligned with dplyr and other packages that use tidyselect (#55)

Bug fixes

• step_rose() now correctly allows you to use characters variables. (#26)
• step_tomek() now ignore non-predictor variables when appropriate. (#51)
• Fix bug where wrong ordering of columns caused error in smote(). (#76)

themis 0.1.4

CRAN release: 2021-06-12

• export smote(), adasyn(), and bsmote() functions to users.

themis 0.1.3

CRAN release: 2020-11-12

• Steps that use nearest neighbors gives cleaner errors.

themis 0.1.2

CRAN release: 2020-08-14

• tuneable steps now properly work with tune package.
• Steps now Retain original factor level ordering. (#22)
• Oversampling steps now ignore non-predictor variables when appropriate. (#20)

themis 0.1.1

CRAN release: 2020-05-17

• step_smote() now work regardless of order of classes. Thanks to @sebastien-foulle for point it out #14.

themis 0.1.0

CRAN release: 2020-01-13

• Added a NEWS.md file to track changes to the package.