lightautoml.transformers

Basic feature generation steps and helper utils.

Base Classes

LAMLTransformer	Base class for transformer method (like sklearn, but works with datasets).
SequentialTransformer	Transformer that contains the list of transformers and apply one by one sequentially.
UnionTransformer	Transformer that apply the sequence on transformers in parallel on dataset and concatenate the result.
ColumnsSelector	Select columns to pass to another transformers (or feature selection).
ColumnwiseUnion	Apply 1 columns transformer to all columns.
BestOfTransformers	Apply multiple transformers and select best.
ConvertDataset	Convert dataset to given type.
ChangeRoles	Change data roles (include dtypes etc).

Numeric

NaNFlags	Create NaN flags.
FillnaMedian	Fillna with median.
FillInf	Fill inf with nan to handle as nan value.
LogOdds	Convert probs to logodds.
StandardScaler	Classic StandardScaler.
QuantileBinning	Discretization of numeric features by quantiles.

Categorical

LabelEncoder	Simple LabelEncoder in order of frequency.
OHEEncoder	Simple OneHotEncoder over label encoded categories.
FreqEncoder	Labels are encoded with frequency in train data.
OrdinalEncoder	Encoding ordinal categories into numbers.
TargetEncoder	Out-of-fold target encoding.
MultiClassTargetEncoder	Out-of-fold target encoding for multiclass task.
CatIntersectstions	Build label encoded intertsections of categorical variables.

Datetime

TimeToNum	Basic conversion strategy, used in selection one-to-one transformers.
BaseDiff	Basic conversion strategy, used in selection one-to-one transformers.
DateSeasons	Basic conversion strategy, used in selection one-to-one transformers.

Decompositions

PCATransformer	PCA.
SVDTransformer	TruncatedSVD.

Text

TunableTransformer	Base class for ML transformers.
TfidfTextTransformer	Simple Tfidf vectorizer.
TokenizerTransformer	Simple tokenizer transformer.
OneToOneTransformer	Out-of-fold sgd model prediction to reduce dimension of encoded text data.
ConcatTextTransformer	Concat text features transformer.
AutoNLPWrap	Calculate text embeddings.

Image

ImageFeaturesTransformer	Simple image histogram.
AutoCVWrap	Calculate image embeddings.