Package index • baflakehouse

Data Ingestion & Lakehouse Setup

Functions for moving raw CSV data into the MinIO Lakehouse as partitioned Parquet.

baflakehouse-package: baflakehouse: Lakehouse Workflow for the Bank Account Fraud Dataset

convert_to_parquet(): Convert BAF CSV to partitioned Parquet in MinIO (S3)

connect_baf(): Connect to BAF dataset on MinIO (Arrow or DuckDB)

clean_baf_base(): Clean the BAF Base dataset and write to 03_primary

Feature Engineering & Preprocessing

Recipes and transformations applied across the pipeline layers.

engineer_features(): Engineer features for the BAF dataset

generate_model_inputs(): Generate Resampled Model Inputs

build_eda_recipe(): Build EDA Recipe

build_baf_recipe(): Build Untrained BAF Recipe

Exploratory Data Analysis

Diagnostic model and visualizations for understanding the fraud signal.

train_diag_model(): Train Diagnostic Model

plot_var_imp(): Plot Variable Importance

plot_hexbin_interaction(): Plot Hexbin Interaction

plot_missingness(): Plot Missingness Signal

plot_num_cor(): Plot Numeric Correlation Matrix

Model Selection & Tuning

Imbalance strategy tournament, hyperparameter tuning, and results formatting.

run_imbalance_tournament(): Run Class Imbalance Tournament

tune_lgbm(): Tune LightGBM Hyperparameters

format_tournament_gt(): Format Tournament Results Table

plot_efficiency(): Plot Effectiveness vs Efficiency

Final Evaluation & Production Deployment

Holdout evaluation on months 6-7 and MinIO model artifact serialization.

evaluate_final_model(): Final Model Evaluation (Months 6 & 7)

train_production_model(): Train and Serialize Production LightGBM Model

Reporting

Figures, tables, and slide rendering for the Quarto presentation.

plot_fraud_by_month(): Plot applications by month (Legit vs Fraud) on a log scale

plot_conf_mat_heatmap(): Plot Confusion Matrix Heatmap

compute_fraud_by_month(): Fraud prevalence by month (counts + percent)

format_fraud_by_month_gt(): Format fraud-by-month table as a gt object

save_report_figure(): Save a report figure artifact

save_report_table(): Save a report table artifact

render_slides(): Render Quarto revealjs slideshow after required assets exist