Repository for source code of kaggle competition: House Prices: Advanced Regression Techniques
There are several factors that influence the price a buyer is willing to pay for a house. Some are apparent and obvious and some are not. Nevertheless, a rational approach facilitated by machine learning can be very useful in predicting the house price. A large data set with 79 different features (like living area, number of rooms, location etc) along with their prices are provided for residential homes in Ames, Iowa. The challenge is to learn a relationship between the important features and the price and use it to predict the prices of a new set of houses.
You can make a clone of the repository from Github on your local machine using the following command (prerequisite: you need git installed on your system):
$ git clone https://github.com/data-doctors/kaggle-house-prices-advanced-regression-techniques
data folder contains original data
01-eda: Exploratory data analysis
Plot distribution of the numerical features examine the skewness Plot correlation matrix between the features
02-cleaning: Cleaning and preprocessing of data
remove skewenes of target features handle missing values in categorical features handle missing values in numerical features feature selection
03-feature_engineering: Engineering new features
Some examples:
A total area was created as a new feature by adding the basement area and living area. The number of bathrooms were added together to create a new feature. For numerical features with significant skewness, logarithms were taken to create new features. Some features were dropped that did not contribute significantly in predicting the SalePrice.
04-modelling: Fitting different models on the cleaned data and predict the house price on test set
The hyperparameters of all the single models were optimized by maximizing the cross validation score using the training set In order to train all the models (kept in models/tuning folder) in series the following shell script can be executed:
''' $ ./run_all.sh RMSE-xgb-CV(7)=0.15017262592+-0.0403780999289 RMSE-lgb-CV(7)=0.230416102431+-0.0982360336472 RMSE-rf-CV(7)=0.178752572944+-0.0495588133233 RMSE-et-CV(7)=0.177138296419+-0.0523244324721 RMSE-lasso-CV(7)=0.167043833535+-0.0590946122368 RMSE-ridge-CV(7)=0.16305872566+-0.0592719750453 RMSE-elasticnet-CV(7)=0.166431639245+-0.0591651827043 '''
Then the optimized parameters were plugged in the single models that are kept in models/single folder.
$ python models/single/model_xgb.py save
Best single models:
| Model | CV | LB |
|---|---|---|
| DecisionTreeRegressor | 0.19013+-0.01304 | 0.18804 |
| RandomForestRegressor | 0.14744+-0.00871 | 0.14623 |
| ExtraTreesRegressor | 0.13888+-0.01208 | 0.15194 |
| XGBoost | 0.12137+-0.01128 | 0.12317 |
| LightGBM | 0.20030+-0.01182 | 0.21416 |
| Lasso | 0.11525+-0.01191 | 0.12091 |
| Ridge | 0.11748+-0.01170 | 0.12263 |
| ElasticNet | 0.11364+-0.01677 | 0.11976 |
| SVM | 0.19752+-0.01386 | 0.20416 |
We used 10 single models to individually predict the results. It is well established that a stacking/blending of the predictions by single models can improve the final results. Also it is ideal to select a few best performing but uncorrelated models for this purpose instead of considering all of them.
Inside 04-modelling/ensembling folder the correlations and performances of the single models were explored using the corr-coeff notebook.
5 best performing and least correlated models were selected and stacked together (using 04-modelling/ensembling/stacking notebook) to make the final prediction.
The Ames Housing dataset was compiled by Dean De Cock for use in data science education. It's an incredible alternative for data scientists looking for a modernized and expanded version of the often cited Boston Housing dataset.