  Online leading has disrupted the traditional consumer banking sector with
more effective loan processing. Risk prediction and monitoring is critical for
the success of the business model. Traditional credit score models fall short
in applying big data technology in building risk model. In this manuscript,
data with various format and size were collected from public website,
third-parties and assembled with client's loan application information data.
Ensemble machine learning models, random forest model and XGBoost model, were
built and trained with the historical transaction data and subsequently tested
with separate data. XGBoost model shows higher K-S value, suggesting better
classification capability in this task. Top 10 important features from the two
models suggest external data such as zhimaScore, multi-platform stacking loans
information, and social network information are important factors in predicting
loan default probability.
