Note

This page is a reference documentation. It only explains the class signature, and not how to use it. Please refer to the What you really need to know section for the big picture.

julearn.transformers.ChangeColumnTypes

class julearn.transformers.ChangeColumnTypes(X_types_renamer, apply_to, row_select_col_type=None, row_select_vals=None)

Transformer to change the column types.

Parameters:

X_typesdict, optional

A dictionary with the column types to set. The keys are the column types and the values are the columns to set the type to. If None, will set all the column types to continuous (default is None).

apply_toColumnTypesLike, optional

From which feature types (‘X_types’) to remove confounds.

row_select_col_typestr or list of str or set of str or ColumnTypes

The column types needed to select rows (default is None) Not really useful for this one, but here for compatibility.

row_select_valsstr, int, bool or list of str, int, bool

The value(s) which should be selected in the row_select_col_type to select the rows used for training (default is None) Not really useful for this one, but here for compatibility.

__init__(X_types_renamer, apply_to, row_select_col_type=None, row_select_vals=None)

transform(X)

Change the column types.

Parameters:

Xpd.DataFrame

Data to set the column types.

Returns:

pd.DataFrame

The transformed data.

get_feature_names_out(input_features=None)

Get names of features to be returned.

Parameters:

input_featuresNone

Parameter to ensure scikit-learn compatibility. It is not used by the method.

Returns:

list

Names of features to be kept in the output pd.DataFrame.

filter_columns(X)

Get the apply_to columns of a pandas DataFrame.

Parameters:

Xpd.DataFrame

The DataFrame to filter.

Returns:

pd.DataFrame

The DataFrame with only the apply_to columns.

fit(X, y=None, **fit_params)

Fit the model.

This method will fit the model using only the columns selected by apply_to.

Parameters:

Xpd.DataFrame

The data to fit the model on.

yDataLike, optional

The target data (default is None).

**fit_paramsAny

Additional parameters to pass to the model’s fit method.

Returns:

JuTransformer

The fitted model.

fit_transform(X, y=None, **fit_params)

Fit to data, then transform it.

Fits transformer to X and y with optional parameters fit_params and returns a transformed version of X.

Parameters:

Xarray-like of shape (n_samples, n_features)

Input samples.

yarray-like of shape (n_samples,) or (n_samples, n_outputs), default=None

Target values (None for unsupervised transformations).

**fit_paramsdict

Additional fit parameters.

Returns:

X_newndarray array of shape (n_samples, n_features_new)

Transformed array.

get_apply_to()

Get the column types the estimator applies to.

Returns:

ColumnTypes

The column types the estimator applies to.

get_metadata_routing()

Get metadata routing of this object.

Please check User Guide on how the routing mechanism works.

Returns:

routingMetadataRequest

A MetadataRequest encapsulating routing information.

get_needed_types()

Get the column types needed by the estimator.

Returns:

ColumnTypes

The column types needed by the estimator.

get_params(deep=True)

Get parameters for this estimator.

Parameters:

deepbool, default=True

If True, will return the parameters for this estimator and contained subobjects that are estimators.

Returns:

paramsdict

Parameter names mapped to their values.

set_output(*, transform=None)

Set output container.

See Introducing the set_output API for an example on how to use the API.

Parameters:

transform{“default”, “pandas”}, default=None

Configure output of transform and fit_transform.

• “default”: Default output format of a transformer

• “pandas”: DataFrame output

• “polars”: Polars output

• None: Transform configuration is unchanged

New in version 1.4: “polars” option was added.

Returns:

selfestimator instance

Estimator instance.

set_params(**params)

Set the parameters of this estimator.

The method works on simple estimators as well as on nested objects (such as Pipeline). The latter have parameters of the form <component>__<parameter> so that it’s possible to update each component of a nested object.

Parameters:

**paramsdict

Estimator parameters.

Returns:

selfestimator instance

Estimator instance.