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Transform a Column #255

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patrikguempel opened this issue Apr 28, 2023 · 2 comments · Fixed by #270
Closed

Transform a Column #255

patrikguempel opened this issue Apr 28, 2023 · 2 comments · Fixed by #270
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enhancement 💡 New feature or request released Included in a release

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@patrikguempel
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patrikguempel commented Apr 28, 2023 •
edited by lars-reimann
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Is your feature request related to a problem?

A Table can already be transformed by calling transform_table or transform_column. It would be nice to have this capability on a Column too.

Desired solution

  • Add a method transform to Column:
class Column(Sequence[_T]):
    def transform(self, transformer: Callable[[_T], _O]) -> Column[_O]:
        ...
  • Map transformer over the values of the column and collect the results
  • As usual, it should not change the receiving instance but return a new Column.

Possible alternatives (optional)

No response

Screenshots (optional)

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Additional Context (optional)

The apply function of pandas could be useful here.
@patrikguempel patrikguempel added the enhancement 💡 New feature or request label Apr 28, 2023
@lars-reimann
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lars-reimann commented Apr 28, 2023 •
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Table already has transform_table and transform_column. A Row has heterogeneous values, so I don't see much use for it. That leaves only a transform function for column, which would be a nice addition. I've adjusted the OP accordingly.

@lars-reimann lars-reimann changed the title Forward panda's 'apply'-function to modify data in Row, Column and Table Transform a Column Apr 28, 2023
@patrikguempel patrikguempel linked a pull request May 5, 2023 that will close this issue
feat: Added Column#transform #270
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@patrikguempel patrikguempel mentioned this issue May 5, 2023
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@patrikguempel patrikguempel self-assigned this May 5, 2023
lars-reimann added a commit that referenced this issue May 6, 2023
@patrikguempel @megalinter-bot @lars-reimann
feat: Added Column#transform (#270)
40fb756 
Closes #255 .

### Summary of Changes

Users are now able to call Column#transform to apply a function to every
data point within the column

Co-authored-by: [email protected]

---------

Co-authored-by: megalinter-bot <[email protected]>
Co-authored-by: Lars Reimann <[email protected]>
lars-reimann pushed a commit that referenced this issue May 11, 2023
@semantic-release-bot
chore(release): 0.12.0 [skip ci]
9189356 
## [0.12.0](v0.11.0...v0.12.0) (2023-05-11)

### Features

* add `learning_rate` to AdaBoost classifier and regressor. ([#251](#251)) ([7f74440](7f74440)), closes [#167](#167)
* add alpha parameter to `lasso_regression` ([#232](#232)) ([b5050b9](b5050b9)), closes [#163](#163)
* add parameter `lasso_ratio` to `ElasticNetRegression` ([#237](#237)) ([4a1a736](4a1a736)), closes [#166](#166)
* Add parameter `number_of_tree` to `RandomForest` classifier and regressor ([#230](#230)) ([414336a](414336a)), closes [#161](#161)
* Added `Table.plot_boxplots` to plot a boxplot for each numerical column in the table ([#254](#254)) ([0203a0c](0203a0c)), closes [#156](#156) [#239](#239)
* Added `Table.plot_histograms` to plot a histogram for each column in the table ([#252](#252)) ([e27d410](e27d410)), closes [#157](#157)
* Added `Table.transform_table` method which returns the transformed Table ([#229](#229)) ([0a9ce72](0a9ce72)), closes [#110](#110)
* Added alpha parameter to `RidgeRegression` ([#231](#231)) ([1ddc948](1ddc948)), closes [#164](#164)
* Added Column#transform ([#270](#270)) ([40fb756](40fb756)), closes [#255](#255)
* Added method `Table.inverse_transform_table` which returns the original table ([#227](#227)) ([846bf23](846bf23)), closes [#111](#111)
* Added parameter `c` to `SupportVectorMachines` ([#267](#267)) ([a88eb8b](a88eb8b)), closes [#169](#169)
* Added parameter `maximum_number_of_learner` and `learner` to `AdaBoost` ([#269](#269)) ([bb5a07e](bb5a07e)), closes [#171](#171) [#173](#173)
* Added parameter `number_of_trees` to `GradientBoosting` ([#268](#268)) ([766f2ff](766f2ff)), closes [#170](#170)
* Allow arguments of type pathlib.Path for file I/O methods ([#228](#228)) ([2b58c82](2b58c82)), closes [#146](#146)
* convert `Schema` to `dict` and format it nicely in a notebook ([#244](#244)) ([ad1cac5](ad1cac5)), closes [#151](#151)
* Convert between Excel file and `Table` ([#233](#233)) ([0d7a998](0d7a998)), closes [#138](#138) [#139](#139)
* convert containers for tabular data to HTML ([#243](#243)) ([683c279](683c279)), closes [#140](#140)
* make `Column` a subclass of `Sequence` ([#245](#245)) ([a35b943](a35b943))
* mark optional hyperparameters as keyword only ([#296](#296)) ([44a41eb](44a41eb)), closes [#278](#278)
* move exceptions back to common package ([#295](#295)) ([a91172c](a91172c)), closes [#177](#177) [#262](#262)
* precision metric for classification ([#272](#272)) ([5adadad](5adadad)), closes [#185](#185)
* Raise error if an untagged table is used instead of a `TaggedTable` ([#234](#234)) ([8eea3dd](8eea3dd)), closes [#192](#192)
* recall and F1-score metrics for classification ([#277](#277)) ([2cf93cc](2cf93cc)), closes [#187](#187) [#186](#186)
* replace prefix `n` with `number_of` ([#250](#250)) ([f4f44a6](f4f44a6)), closes [#171](#171)
* set `alpha` parameter for regularization of `ElasticNetRegression` ([#238](#238)) ([e642d1d](e642d1d)), closes [#165](#165)
* Set `column_names` in `fit` methods of table transformers to be required ([#225](#225)) ([2856296](2856296)), closes [#179](#179)
* set learning rate of Gradient Boosting models ([#253](#253)) ([9ffaf55](9ffaf55)), closes [#168](#168)
* Support vector machine for regression and for classification ([#236](#236)) ([7f6c3bd](7f6c3bd)), closes [#154](#154)
* usable constructor for `Table` ([#294](#294)) ([56a1fc4](56a1fc4)), closes [#266](#266)
* usable constructor for `TaggedTable` ([#299](#299)) ([01c3ad9](01c3ad9)), closes [#293](#293)

### Bug Fixes

* OneHotEncoder no longer creates duplicate column names ([#271](#271)) ([f604666](f604666)), closes [#201](#201)
* selectively ignore one warning instead of all warnings ([#235](#235)) ([3aad07d](3aad07d))
@lars-reimann
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🎉 This issue has been resolved in version 0.12.0 🎉

The release is available on:

Your semantic-release bot 📦🚀

@lars-reimann lars-reimann added the released Included in a release label May 11, 2023
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