We propose a new approach for Collaborative filtering which is based on Boolean Matrix Factorisation (BMF) and Formal Concept Analysis. In a series of experiments on real data (MovieLens dataset) we compare the approa...
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ISBN:
(纸本)9783319105543;9783319105536
We propose a new approach for Collaborative filtering which is based on Boolean Matrix Factorisation (BMF) and Formal Concept Analysis. In a series of experiments on real data (MovieLens dataset) we compare the approach with an SVD-based one in terms of Mean Average Error (MAE). One of the experimental consequences is that it is enough to have a binary-scaled rating data to obtain almost the same quality in terms of MAE by BMF as for the SVD-based algorithm in case of non-scaled data.
We conducted a quantitatively coarse-grained, but wide-ranging evaluation of the frequency recommender algorithms provide 'good' and 'bad' recommendations, with a focus on the latter. We found 151 algo...
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We conducted a quantitatively coarse-grained, but wide-ranging evaluation of the frequency recommender algorithms provide 'good' and 'bad' recommendations, with a focus on the latter. We found 151 algorithmic audits from 33 studies that report fitting risk-utility statistics from YouTube, Google Search, Twitter, Facebook, TikTok, Amazon, and others. Our findings indicate that roughly 8-10% of algorithmic recommendations are 'bad', while about a quarter actively protect users from self-induced harm ('do good'). This average is remarkably consistent across the audits, irrespective of the platform nor on the kind of risk (bias/ discrimination, mental health and child harm, misinformation, or political extremism). Algorithmic audits find negative feedback loops that can ensnare users into spirals of 'bad' recommendations (or being 'dragged down the rabbit hole'), but also highlight an even larger likelihood of positive spirals of 'good recommendations'. While our analysis refrains from any judgment of the causal consequences and severity of risks, the detected levels surpass those associated with many other consumer products. They are comparable to the risk levels of generic food defects monitored by public authorities such as the FDA or FSIS in the United States. Consequently, our findings inform the ongoing discussion regarding regulatory oversight of the potential risks posed by recommender algorithms.
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