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While hard-coding physical symmetries (equivariance) into a model is theoretically efficient, it can fail in practice. Prof. Welling explains that these constraints can complicate the optimization landscape, making it harder to find good minima. Sometimes, abundant data augmentation with a simpler model yields superior results.

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The path to a general-purpose AI model is not to tackle the entire problem at once. A more effective strategy is to start with a highly constrained domain, like generating only Minecraft videos. Once the model works reliably in that narrow distribution, incrementally expand the training data and complexity, using each step as a foundation for the next.

AI development history shows that complex, hard-coded approaches to intelligence are often superseded by more general, simpler methods that scale more effectively. This "bitter lesson" warns against building brittle solutions that will become obsolete as core models improve.

The history of AI, such as the 2012 AlexNet breakthrough, demonstrates that scaling compute and data on simpler, older algorithms often yields greater advances than designing intricate new ones. This "bitter lesson" suggests prioritizing scalability over algorithmic complexity for future progress.

The "bitter lesson" in AI research posits that methods leveraging massive computation scale better and ultimately win out over approaches that rely on human-designed domain knowledge or clever shortcuts, favoring scale over ingenuity.

The breakthrough performance of Nano Banana wasn't just about massive datasets. The team emphasizes the importance of 'craft'—attention to detail, high-quality data curation, and numerous small design decisions. This human element of quality control is as crucial as model scale.

The adoption of powerful AI architectures like transformers in robotics was bottlenecked by data quality, not algorithmic invention. Only after data collection methods improved to capture more dexterous, high-fidelity human actions did these advanced models become effective, reversing the typical 'algorithm-first' narrative of AI progress.

To make genuine scientific breakthroughs, an AI needs to learn the abstract reasoning strategies and mental models of expert scientists. This involves teaching it higher-level concepts, such as thinking in terms of symmetries, a core principle in physics that current models lack.

To overcome a small training set, researchers discretized continuous growth inhibition data into a binary (yes/no) classification. This simplified the learning task, enabling the model to achieve high predictive power where a more complex regression model would have failed due to insufficient data.

When pre-training a large multimodal model, including small samples from many diverse modalities (like LiDAR or MRI data) is highly beneficial. This "tempts" the model, giving it an awareness that these data types exist and have structure. This initial exposure makes the model more adaptable for future fine-tuning on those specific domains.

AI models use simple, mathematically clean loss functions. The human brain's superior learning efficiency might stem from evolution hard-coding numerous, complex, and context-specific loss functions that activate at different developmental stages, creating a sophisticated learning curriculum.