Model Evaluation

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Test Set

A test set is a collection of examples reserved from model fitting and model selection so that it can evaluate a fixed machine learning model or a fully specified learning procedure.

Machine Learning

The Leaderboard Illusion

The Leaderboard Illusion is a 2025 research paper, led by Cohere and Cohere Labs with academic collaborators, that argues the most influential public ranking of large language models, Chatbot Arena

AI Companies

True negative

A true negative (TN) is a case that a binary classification model correctly predicts as belonging to the negative class: the true label is negative and the predicted label is also negative.

Machine LearningStatistics

True positive rate (TPR)

The true positive rate (TPR) is the proportion of actual positive cases that a classifier correctly identifies as positive, computed as TPR = TP / (TP + FN), where TP is the number of true positives and FN the…

Machine Learning

Validation Set

A validation set (also called a development set or dev set) is a subset of labeled data that is held out from the training set and used to evaluate a model's performance during development

Machine Learning

Vals AI

Vals AI is an independent, third-party AI model evaluation company based in San Francisco that builds and publishes domain-specific benchmarks measuring how well large language models perform on real…

AI Companies

WebArena

WebArena is a realistic, self-hosted web environment and benchmark designed for developing and evaluating autonomous AI agents that perform tasks on the web.

AI AgentsAI Benchmarks

WebVoyager

WebVoyager is an end-to-end web agent and its companion benchmark, introduced by Hongliang He and seven coauthors in a paper accepted to ACL 2024 .

AI AgentsAI Benchmarks

WildBench

WildBench is an automated evaluation framework for large language models (LLMs) introduced by the Allen Institute for AI (AI2) in 2024.

AI Benchmarks

chrF

chrF is a machine translation evaluation metric that scores a candidate translation by counting the character n-grams it shares with one or more reference translations, then combining character n-gram…

Machine LearningNatural Language Processing