What an ID column, a date string, and a missing value taught me.The post My Machine Learning Pipeline Cheated, and Cross-Validation Never Noticed appeared first on Towards Data Science. Source: Towards Data Science · Summarized by HeadlinesBriefing Related articlesTuchel frustrated by 'freestyling' as NZ boss says England 'need to be better''There was a lot of hurt' - heartache drove Cross to Armagh gloryBotched final play sees Luka hesitate, LeBron missHow machines learned precisionEngland booed off after limp Japan defeatMore from Towards Data ScienceClaude Code vs. Cursor: What a Field Test Shows That the Feature Comparisons MissAgentic AI in Production: Why Your Agent Keeps Answering After Its Tools FailData Enablement for AI: A Practitioner's Guide to 6 Advanced Architectural PatternsHow to Add Guardrails to a Local LLM AgentPython 3.15 Has a New ProfilerLatest in DeveloperWriting Is Closer to Thought Than Code · Hacker NewsTasks as Code: Move Your Tickets into the Repository · Hacker NewsWebsites Should Be Printable · Hacker NewsThe focus on AI safety disasters ignores everyday harms · MIT Technology Review AISwitzerland. Block by block. At 1:1 scale · Hacker NewsRelated briefingsDeveloper & AI 24-Hour BriefingDeveloper & AI 8-Hour BriefingHomeDeveloperMy Machine Learning Pipeline Cheated, and Cross-Validation Never…SectionsHomePublic MarketsPrivate MarketsTech & GamesMobileDeveloperF1Sports