<ul><li>The Learning Curves Database 1.1 (LCDB 1.1) shows that learning curves are less often well-behaved than previously assumed.</li><li>Statistically rigorous methods reveal significant ill-behavior in approximately 14% of learning curves, double the previous estimates.</li><li>Specific learners are identified to be more ill-behaved than others, and different feature scalings do not usually resolve this issue.</li><li>The impact of ill-behavior on tasks like learning curve fitting and model selection is evaluated, indicating significant challenges and the importance of LCDB 1.1 as a benchmark for future research.</li></ul>

LCDB 1.1: A Database Illustrating Learning Curves Are More Ill-Behaved Than Previously Thought

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