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The concept of absence of opportunities for free lunches is one of the pillars in the economic theory of financial markets. This natural assumption has proved very fruitful and has lead to great mathematical, as well as economical, insights…

General Finance · Quantitative Finance 2010-02-16 Constantinos Kardaras

The no free lunch theorem states that no model is better suited to every problem. A question that arises from this is how to design methods that propose optimizers tailored to specific problems achieving state-of-the-art performance. This…

Machine Learning · Computer Science 2021-03-08 Hugo Siqueira Gomes , Benjamin Léger , Christian Gagné

Machine learning has achieved tremendous success in a variety of domains in recent years. However, a lot of these success stories have been in places where the training and the testing distributions are extremely similar to each other. In…

Machine Learning · Statistics 2021-03-05 Martin Arjovsky

A critical problem in the field of post hoc explainability is the lack of a common foundational goal among methods. For example, some methods are motivated by function approximation, some by game theoretic notions, and some by obtaining…

Machine Learning · Computer Science 2023-01-02 Tessa Han , Suraj Srinivas , Himabindu Lakkaraju

Machine learning methods often fail when deployed in the real world. Worse still, they fail in high-stakes situations and across socially sensitive lines. These issues have a chilling effect on the adoption of machine learning methods in…

Machine Learning · Computer Science 2025-09-05 Charles Jones , Ben Glocker

In learning-assisted theorem proving, one of the most critical challenges is to generalize to theorems unlike those seen at training time. In this paper, we introduce INT, an INequality Theorem proving benchmark, specifically designed to…

Artificial Intelligence · Computer Science 2021-04-06 Yuhuai Wu , Albert Qiaochu Jiang , Jimmy Ba , Roger Grosse

The no-free-lunch (NFL) theorem is a celebrated result in learning theory that limits one's ability to learn a function with a training data set. With the recent rise of quantum machine learning, it is natural to ask whether there is a…

Quantum Physics · Physics 2022-03-01 Kunal Sharma , M. Cerezo , Zoë Holmes , Lukasz Cincio , Andrew Sornborger , Patrick J. Coles

Inverse reinforcement learning (IRL) attempts to infer human rewards or preferences from observed behavior. Since human planning systematically deviates from rationality, several approaches have been tried to account for specific human…

Artificial Intelligence · Computer Science 2019-01-14 Stuart Armstrong , Sören Mindermann

Across machine learning (ML) sub-disciplines researchers make mathematical assumptions to facilitate proof-writing. While such assumptions are necessary for providing mathematical guarantees for how algorithms behave, they also necessarily…

Computers and Society · Computer Science 2020-11-05 A. Feder Cooper

In this paper, we prove a crucial theorem called Mirroring Theorem which affirms that given a collection of samples with enough information in it such that it can be classified into classes and subclasses then (i) There exists a mapping…

Machine Learning · Computer Science 2009-11-03 Dasika Ratna Deepthi , K. Eswaran

Cross-validation is a popular non-parametric method for evaluating the accuracy of a predictive rule. The usefulness of cross-validation depends on the task we want to employ it for. In this note, I discuss a simple non-parametric setting,…

Methodology · Statistics 2019-09-27 Stefan Wager

We consider the learning of algorithmic tasks by mere observation of input-output pairs. Rather than studying this as a black-box discrete regression problem with no assumption whatsoever on the input-output mapping, we concentrate on tasks…

Machine Learning · Computer Science 2018-10-16 Alex Nowak-Vila , David Folqué , Joan Bruna

Evolutionary transfer optimization (ETO) has been gaining popularity in research over the years due to its outstanding knowledge transfer ability to address various challenges in optimization. However, a pressing issue in this field is that…

Neural and Evolutionary Computing · Computer Science 2025-03-28 Xiaoming Xue , Liang Feng , Yinglan Feng , Rui Liu , Kai Zhang , Kay Chen Tan

We show how any PAC learning algorithm that works under the uniform distribution can be transformed, in a blackbox fashion, into one that works under an arbitrary and unknown distribution $\mathcal{D}$. The efficiency of our transformation…

Machine Learning · Statistics 2023-03-31 Guy Blanc , Jane Lange , Ali Malik , Li-Yang Tan

Large Reasoning Models (LRMs) have achieved remarkable performance on complex tasks by engaging in extended reasoning before producing final answers, yet this strength introduces the risk of overthinking, where excessive token generation…

Computation and Language · Computer Science 2025-06-25 Shu Yang , Junchao Wu , Xuansheng Wu , Derek Wong , Ninhao Liu , Di Wang

In this overview article we will consider the deliberate restarting of algorithms, a meta technique, in order to improve the algorithm's performance, e.g., convergence rates or approximation guarantees. One of the major advantages is that…

Optimization and Control · Mathematics 2020-06-29 Sebastian Pokutta

Self-supervised representation learning in computer vision relies heavily on hand-crafted image transformations to learn meaningful and invariant features. However few extensive explorations of the impact of transformation design have been…

Computer Vision and Pattern Recognition · Computer Science 2023-04-25 Ihab Bendidi , Adrien Bardes , Ethan Cohen , Alexis Lamiable , Guillaume Bollot , Auguste Genovesio

The certification of intrinsic randomness is foundational to quantum information theory and central in many practical applications thereof, such as in the generation of unquestionably random numbers and in cryptographic protocols.…

Quantum Physics · Physics 2025-10-27 Maria Ciudad Alañón , Daniel Centeno , Andrew Watford , Elie Wolfe

Over the past decade, several researchers have presented various optimisation algorithms for use in truss design. The no free lunch theorem implies that no optimisation algorithm fits all problems; therefore, the interest is not only in the…

Optimization and Control · Mathematics 2020-08-06 Uche Onyekpe , Stratis Kanarachos , Michael E. Fitzpatrick

Data has now become a shortcoming of deep learning. Researchers in their own fields share the thinking that "deep neural networks might not always perform better when they eat more data," which still lacks experimental validation and a…

Machine Learning · Computer Science 2022-05-31 Jiachen Yang , Zhuo Zhang , Yicheng Gong , Shukun Ma , Xiaolan Guo , Yue Yang , Shuai Xiao , Jiabao Wen , Yang Li , Xinbo Gao , Wen Lu , Qinggang Meng