Search Results for author: Cristián Bravo

Found 16 papers, 6 papers with code

Attention-based Dynamic Multilayer Graph Neural Networks for Loan Default Prediction

no code implementations1 Feb 2024 Sahab Zandi, Kamesh Korangi, María Óskarsdóttir, Christophe Mues, Cristián Bravo

We enhance the model by using a custom attention mechanism that weights the different time snapshots according to their importance.

INFLECT-DGNN: Influencer Prediction with Dynamic Graph Neural Networks

1 code implementation16 Jul 2023 Elena Tiukhova, Emiliano Penaloza, María Óskarsdóttir, Bart Baesens, Monique Snoeck, Cristián Bravo

We compare the results of various models to demonstrate the importance of capturing graph representation, temporal dependencies, and using a profit-driven methodology for evaluation.

Marketing

Optimizing Credit Limit Adjustments Under Adversarial Goals Using Reinforcement Learning

no code implementations27 Jun 2023 Sherly Alfonso-Sánchez, Jesús Solano, Alejandro Correa-Bahnsen, Kristina P. Sendova, Cristián Bravo

Second, given the particularities of our problem, we used an offline learning strategy to simulate the impact of the action based on historical data from a super-app in Latin America to train our reinforcement learning agent.

Decision Making Q-Learning +1

Multi-Modal Deep Learning for Credit Rating Prediction Using Text and Numerical Data Streams

1 code implementation21 Apr 2023 Mahsa Tavakoli, Rohitash Chandra, Fengrui Tian, Cristián Bravo

In this paper, we present an analysis of the most effective architectures for the fusion of deep learning models for the prediction of company credit rating classes, by using structured and unstructured datasets of different types.

Decision Making

On the dynamics of credit history and social interaction features, and their impact on creditworthiness assessment performance

no code implementations13 Apr 2022 Ricardo Muñoz-Cancino, Cristián Bravo, Sebastián A. Ríos, Manuel Graña

Application scoring is used to decide whether to grant a credit or not, while behavioral scoring is used mainly for portfolio management and to take preventive actions in case of default signals.

Management

Deep residential representations: Using unsupervised learning to unlock elevation data for geo-demographic prediction

no code implementations2 Dec 2021 Matthew Stevenson, Christophe Mues, Cristián Bravo

We consider the suitability of this data not just on its own but also as an auxiliary source of data in combination with demographic features, thus providing a realistic use case for the embeddings.

On the combination of graph data for assessing thin-file borrowers' creditworthiness

no code implementations26 Nov 2021 Ricardo Muñoz-Cancino, Cristián Bravo, Sebastián A. Ríos, Manuel Graña

Here we introduce a framework to improve credit scoring models by blending several Graph Representation Learning methods: feature engineering, graph embeddings, and graph neural networks.

Feature Engineering Graph Representation Learning

A transformer-based model for default prediction in mid-cap corporate markets

no code implementations18 Nov 2021 Kamesh Korangi, Christophe Mues, Cristián Bravo

In this paper, we study mid-cap companies, i. e. publicly traded companies with less than US $10 billion in market capitalisation.

Multi-Label Classification Time Series +2

Improving healthcare access management by predicting patient no-show behaviour

1 code implementation10 Dec 2020 David Barrera Ferro, Sally Brailsford, Cristián Bravo, Honora Smith

In this context many researchers have used multiple regression models to identify patient and appointment characteristics than can be used as good predictors for no-show probabilities.

Decision Making Management +1

Multilayer Network Analysis for Improved Credit Risk Prediction

1 code implementation19 Oct 2020 María Óskarsdóttir, Cristián Bravo

We present a multilayer network model for credit risk assessment.

Evolution of Credit Risk Using a Personalized Pagerank Algorithm for Multilayer Networks

1 code implementation25 May 2020 Cristián Bravo, María Óskarsdóttir

Our personalized PageRank algorithm for multilayer networks allows for quantifying how credit risk evolves across time and propagates through these networks.

Super-App Behavioral Patterns in Credit Risk Models: Financial, Statistical and Regulatory Implications

no code implementations9 May 2020 Luisa Roa, Alejandro Correa-Bahnsen, Gabriel Suarez, Fernando Cortés-Tejada, María A. Luque, Cristián Bravo

In this paper we present the impact of alternative data that originates from an app-based marketplace, in contrast to traditional bureau data, upon credit scoring models.

The value of text for small business default prediction: A deep learning approach

no code implementations19 Mar 2020 Matthew Stevenson, Christophe Mues, Cristián Bravo

Compared to consumer lending, Micro, Small and Medium Enterprise (mSME) credit risk modelling is particularly challenging, as, often, the same sources of information are not available.

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