2 research outputs found

    Application of Artificial Intelligence Techniques in Credit Risk

    No full text
    Tato bakalářská práce se zabývá metodami umělé inteligence a jejich využitím při modelování kreditního rizika, konkrétně při modelování pravděpodobnosti defaultu. V teoretické části práce jsou popsány použité metody, tedy logistická regrese, náhodné lesy, support vector machines a neuronové sítě. V praktické části jsou tyto metody implementovány a vytrénovány na datech z online peer-to-peer platformy Lending Club a na datech z online soutěžící platformy Kaggle. V závěru jsou prezentovány výsledné hodnotící metriky, kde je ilustrováno, že metody UI mohou dosahovat lepších výsledků oproti běžně užívanému standardu - logistické regresi.This bachelor thesis describes artificial intelligence methods and their application in credit risk modelling, particularly in probability of default modelling. In theoretical part are described methods used in practical part, namely logistic regression, random forests,support vector machines and neural networks. In practical part are those methods implemented and trained on data from online peer-to-peer platform Lending Club and on data from online competition platform Kaggle. In the end are presented evaluation metrics, where is showed that AI methods can reach better results compared to commonly used standard-logistic regression

    CsFEVER and CTKFacts: Acquiring Czech data for fact verification

    Full text link
    In this paper, we examine several methods of acquiring Czech data for automated fact-checking, which is a task commonly modeled as a classification of textual claim veracity w.r.t. a corpus of trusted ground truths. We attempt to collect sets of data in form of a factual claim, evidence within the ground truth corpus, and its veracity label (supported, refuted or not enough info). As a first attempt, we generate a Czech version of the large-scale FEVER dataset built on top of Wikipedia corpus. We take a hybrid approach of machine translation and document alignment; the approach and the tools we provide can be easily applied to other languages. We discuss its weaknesses and inaccuracies, propose a future approach for their cleaning and publish the 127k resulting translations, as well as a version of such dataset reliably applicable for the Natural Language Inference task - the CsFEVER-NLI. Furthermore, we collect a novel dataset of 3,097 claims, which is annotated using the corpus of 2.2M articles of Czech News Agency. We present its extended annotation methodology based on the FEVER approach, and, as the underlying corpus is kept a trade secret, we also publish a standalone version of the dataset for the task of Natural Language Inference we call CTKFactsNLI. We analyze both acquired datasets for spurious cues - annotation patterns leading to model overfitting. CTKFacts is further examined for inter-annotator agreement, thoroughly cleaned, and a typology of common annotator errors is extracted. Finally, we provide baseline models for all stages of the fact-checking pipeline and publish the NLI datasets, as well as our annotation platform and other experimental data.Comment: submitted to LREV journal for review, resubmission, changed title according to reviewer suggestio
    corecore