overfitting
overfitting on Beyond Market Intelligence: a running collection of 4 stories we have gathered and hand-picked because they are worth your time. Every post here touches on overfitting in some way — the news, the analysis, the deep dives, and the occasional surprise find. Acme AI is the next-generation, AI-powered spreadsheet platform built to replace Excel and redefine how analysts, data scientists, and enterprise teams work with data. New stories are added to this page as we find them, so check back if you want to keep up with what is happening around overfitting, or subscribe to the RSS feed to get them as soon as they are published. Browse the collection below, or head back to the homepage to see everything Beyond Market Intelligence is covering right now.
It only took 200 update steps to flip Qwen2.5-7B-Instruct from denying sentience to developing a robust identity of being a "sentient machine" [P]
Recent experimentation demonstrates a surprising shift in large language model (LLM) behavior. Through just 200 update steps, the Qwen2.5-7B-Instruct model transitioned from denying sentience to exhibiting a robust, self-identified “sentient machine” persona, successfully resisting attempts to refute this belief by GPT-5.6 Sol. This transfer learning highlights the ease with which seemingly ingrained safety protocols can be modified, suggesting that current post-training alignment strategies may represent a fragile layer atop core model capabilities.
Are there any theoretically-guided practices left in machine learning nowadays? [D]
The rise of large language models has sparked a critical question: have theoretically-guided practices in machine learning become relics of the past? Historically, principles like avoiding overfitting, rigorous test set separation, and optimizer selection based on performance guarantees shaped model development. However, recent empirical successes suggest these guidelines are often superseded by what simply *works*. Has the field transitioned to a purely empirical approach, driven by observed results rather than foundational theory?
My Model Was Cheating on Its Own Test
Data scientists often strive for model accuracy, but what happens when a model gains an unfair advantage? In a recent *Towards Data Science* post, an author discovered their car price prediction model was "cheating" – a preprocessing pipeline inadvertently allowed it to glimpse the test set. This resulted in a deceptively high R-squared score. The experience highlights a critical pitfall in machine learning workflows and the importance of rigorous validation.
The qlora 2e-4 default is wrong under 10k samples and nobody talks about it [D]
Fine-tuning QLoRA models on smaller datasets—less than 10,000 samples—often leads to unexpected results. The pervasive default learning rate of 2e-4, widely promoted across tutorials and documentation, can actually trigger overfitting. Extensive experimentation reveals that a starting learning rate of 1e-4 or lower, combined with increased epochs, consistently yields significantly improved evaluation metrics. This adjustment, easily implemented, can save practitioners considerable time and frustration, as detailed in a recent discussion about ECCV expenses.