DeathSurfing/featrs

ColumnTransformer has no fitted state — transform-before-fit blames child transformer 17 days ago

bug help wanted good first issue

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Pipeline has no fitted field — unclear error on transform-before-fit 21 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

LazyFrame Support — execute transformers directly on Polars LazyFrames 24 days ago

enhancement help wanted performance Priority

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

GPU Backend — explore GPU acceleration for supported transformations 26 days ago

enhancement help wanted performance dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

DriftDetector — detect feature distribution drift between datasets 26 days ago

enhancement help wanted observability

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Pipeline Versioning — track pipeline versions and schema compatibility 26 days ago

enhancement help wanted serialization

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

ONNX Export — export preprocessing pipelines to the ONNX format 26 days ago

enhancement help wanted dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

ExpressionTransformer — custom transformers via Polars expressions 26 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

DataQualityReport — summarize missing values, outliers, cardinality, and preprocessing recommendations 26 days ago

enhancement help wanted observability

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

AutoImputer — automatically select suitable imputation strategies per column 26 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

AutoScaler — automatically choose an appropriate scaling strategy per column 26 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

AutoPipeline — auto-construct preprocessing pipelines from inferred data schemas 26 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

InverseTransform Support — reversibility trait for mathematically invertible transformers 26 days ago

enhancement help wanted Priority

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

FeatureNamesOut — trait providing consistent output feature names for every transformer 26 days ago

enhancement help wanted refactor Priority

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

SchemaValidator — validate column existence and dtypes before transformation 26 days ago

enhancement help wanted Priority

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

OnlineStatistics — running stats (Welford + optional T-Digest) without full dataset in memory 26 days ago

enhancement help wanted performance dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Streaming API — incremental fit/transform for datasets exceeding RAM 26 days ago

enhancement help wanted performance dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

CharacterNGramVectorizer — character-level n-gram features for text 26 days ago

enhancement help wanted dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

TFIDFVectorizer — generate TF-IDF representations from text data 26 days ago

enhancement help wanted dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

CountVectorizer — convert text into bag-of-words feature vectors 26 days ago

enhancement help wanted dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

CachedPipeline — cache intermediate transformer outputs for repeated execution 26 days ago

enhancement help wanted performance

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

ConditionalPipeline — dispatch to pipelines by column dtype, name pattern, or custom predicate 26 days ago

enhancement help wanted dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

FeatureUnion — apply transformers in parallel, concatenate outputs 26 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

OutlierClipper — clip outliers using IQR, Z-score, or MAD 26 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Winsorizer — clip extreme values at configurable quantiles 26 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

LogTransformer — apply log, log1p, log2, log10 transformations 26 days ago

enhancement help wanted good first issue

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

RatioFeatures — create ratio features (a/b) from numeric column pairs 26 days ago

enhancement help wanted good first issue

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

InteractionFeatures — pairwise interaction features (a·b without full polynomial expansion) 26 days ago

enhancement help wanted good first issue

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

StringCleaner — trim, case normalization, regex replacement for string columns 26 days ago

enhancement help wanted good first issue dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

RareCategoryGrouper — group infrequent categories into "Other" 26 days ago

enhancement help wanted good first issue

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

DuplicateColumnRemover — detect and remove duplicate columns 26 days ago

enhancement help wanted good first issue

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

ConstantColumnRemover — remove single-unique-value columns 26 days ago

enhancement help wanted good first issue

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

ExponentiallyWeightedMovingAverage — EWMA / EWM statistics for time series 26 days ago

enhancement help wanted performance

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

ExpandingAggregator — cumulative window statistics (mean/sum/min/max/std) 26 days ago

enhancement help wanted performance

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

TimeSince — elapsed time from a reference timestamp 26 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

HolidayEncoder — country-specific holiday indicator features 26 days ago

enhancement help wanted dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

DatetimeFeatures — extract year/month/weekday/hour/quarter from datetime columns 26 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

LeaveOneOutEncoder — target encoding with leave-one-out cross-fitting 26 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

BinaryEncoder — binary digit encoding for high-cardinality categoricals 26 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

TargetEncoder — encode categories with target mean + smoothing (leakage prevention) 26 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

CountEncoder — replace categories with occurrence counts 26 days ago

enhancement help wanted good first issue

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

FrequencyEncoder — replace categories with observed frequencies 26 days ago

enhancement help wanted good first issue

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

MutualInformationSelector — rank/select features using mutual information 26 days ago

enhancement help wanted dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

SelectPercentile — select top % of features via statistical tests 26 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

CorrelationThreshold — remove highly correlated features above threshold 26 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

KBinsDiscretizer — uniform/quantile/k-means binning of continuous features 26 days ago

enhancement help wanted dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

PowerTransformer — Yeo-Johnson & Box-Cox for skewness reduction 26 days ago

enhancement help wanted dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

QuantileTransformer — transform to uniform/normal distribution via quantiles 26 days ago

enhancement help wanted dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

MaxAbsScaler — scale by maximum absolute value, preserve sparsity 26 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

CyclicalEncoder.fit doesn't validate column dtype (defers to transform) 27 days ago

bug help wanted good first issue

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

PolynomialFeatures bias column name collides with input column named 'bias' 27 days ago

bug help wanted good first issue

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Lagger accepts duplicate periods — silently overwrites lag columns 27 days ago

bug help wanted good first issue

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

SelectKBest doesn't validate k > 0 at construction 27 days ago

bug help wanted good first issue

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Binarizer.fit doesn't validate empty rows (inconsistent with all other transformers) 27 days ago

bug help wanted good first issue

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

ColumnTransformer allows overlapping column specs — confusing late hstack error 27 days ago

bug help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

StandardScaler (and RobustScaler) silently produce NaN params on f64::NAN input 27 days ago

bug help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

MissingIndicator produces inconsistent output schema when transform data has no nulls 27 days ago

bug help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Add serde + bincode model persistence via typetag (Phase 5, deferred) 28 days ago

enhancement help wanted serialization dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Add tracing step-level spans for Pipeline / ColumnTransformer (Phase 4) 28 days ago

enhancement help wanted observability dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Use ahash in FeatureHasher with stable fixed seeds (Phase 3, breaking change) 28 days ago

enhancement help wanted performance dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Add rayon for Normalizer::transform and FeatureHasher::transform (Phase 2, gated on #21/#24) 28 days ago

enhancement help wanted performance dependencies

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Add Send + Sync to DataFrameTransformer supertrait 28 days ago

enhancement help wanted refactor

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Replace hand-rolled aggregations with Polars-native kernels (Phase 1) 28 days ago

enhancement help wanted performance refactor

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Add criterion benchmarks (Phase 0 foundation) 28 days ago

enhancement help wanted benchmarks

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Add proptest property-based tests for invariants 28 days ago

enhancement help wanted testing

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Normalizer Max norm does not use absolute values, producing incorrect output for negative data 28 days ago

bug help wanted good first issue

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Add [lints.rust] section for future-incompatible and nonstandard_style 29 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Align clippy invocation in CI and CONTRIBUTING.md (--all-features --locked) 29 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Audit doc tests for valid executability 29 days ago

documentation help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Promote missing_docs to deny and enforce intra-doc link integrity 29 days ago

documentation help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Remove redundant x.clone().select(...) calls in auto_type and column_transformer 29 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Add [lints.clippy] to Cargo.toml with perf lints at deny level 29 days ago

enhancement help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

MinMaxScaler silently propagates NaN on all-null columns 29 days ago

bug help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Unsupervised transformers say ".fit(dataframe, target)" in NotFitted errors 29 days ago

bug help wanted good first issue

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

SimpleImputer MostFrequent strategy non-deterministic on ties 29 days ago

bug help wanted

DeathSurfing/featrs

4

A Polars-native feature engineering library for Rust.

Rust

#data-science#feature-engineering#machine-learning#polars#preprocessing#rust#scikit-learn

Open Issues Need Help