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How Machines Learn Like Humans

Discover the surprising similarities in learning between large language models and humans.

Leroy Z. Wang, R. Thomas McCoy, Shane Steinert-Threlkeld

― 6 min read


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In the world of machines and artificial intelligence, we are still trying to figure out how these systems learn concepts, much like how humans learn. Imagine teaching a robot to understand what an apple is. It’s not just about showing the robot an apple; it’s about helping it grab the idea that an apple is a round fruit that can be red, green, or yellow. This is not a simple task, but recent studies show that language models can learn concepts by picking patterns from examples, in a way that is both fascinating and a bit like what we do.

What are Large Language Models?

Large Language Models (LLMs) are advanced computer programs designed to understand and generate human language. Think of them as super-smart chatbots that can write essays, answer questions, and even tell stories. They learn by being fed a tremendous amount of text, which helps them to recognize patterns and gain knowledge. However, figuring out how well they can learn new concepts from examples, especially in context, is still a new area of study.

The Learning Style of LLMs

When we teach an LLM a new idea, we often give it a few examples to work with. For instance, if we want to teach it about the term “bnik” (let’s say it means having less than half of something), we give it some prompts that show examples of this idea. After presenting examples where this idea is true and where it is not, we then ask the model a question to see if it can get it right. The success of the model in figuring out the concept seems to depend on how simple the underlying logic is. It turns out, simpler concepts are easier for these models to learn—much like how it is easier for a child to learn “dog” rather than “Mastiff”, as it requires less information to grasp.

Complexity in Learning

The complexity of learning a new idea can be likened to the number of steps it takes to explain something. If you have to use five steps to explain the concept, it’s likely going to be harder to grasp than if you only needed two. Researchers found that LLMs exhibit this same preference for simplicity. They tend to perform better with concepts that have fewer logical operations involved. So, imagine trying to teach a kid calculus before teaching them basic arithmetic—they’d probably be scratching their heads and wondering where the apples went.

The Relationship Between Complexity and Success

Studies have shown that as the complexity of a concept increases, the ability of the LLMs to learn it decreases. This is similar to how we humans struggle with complex topics like quantum physics before we have our basics down. The findings revealed that humans and LLMs share a common ground when it comes to learning new concepts. Simplicity is key, and both seem to prefer straightforward ideas over complicated ones.

Thinking Like Humans

This research shows that LLMs are learning in a way that mirrors human behavior. When humans learn new concepts, we often favor the simplest explanation that fits all the facts. If something is too complicated, we might get confused and give up. So, this characteristic of LLMs suggests that they might be using some similar strategies when faced with new information.

Concept Generation: How Does It Work?

To test how LLMs learn, researchers created many concepts using a logical structure. This structure helps in forming ideas that can be understood easily while also keeping track of how complex those ideas might be. Essentially, a logical grammar helps generate various concepts so that they could be tested for complexity and learning efficiency.

The Experiment Process

The researchers designed prompts that would present various examples to the models. These prompts included a new word (like “bnik”) and examples that indicated whether this word applied in different situations. For instance, they might ask if Alice has “bnick” of the apples given a certain number. This way, the models had a clear task and could learn through repeated examples.

Results And Findings

As expected, the researchers found that when they tested different models of varying sizes, the average success rate dropped as concepts got more complex. Larger models still learned well but showed a clear pattern: keep it simple! Picture trying to explain a rocket science problem to someone with no math background, and you get the idea.

The models were also able to demonstrate learning patterns that are remarkably similar to human learning. In other words, if you presented a complex idea to both a person and an LLM, you’d likely see similar struggles and triumphs in understanding.

Looking Ahead

This research is just the tip of the iceberg. There are still plenty of questions waiting to be answered. For instance, how do LLMs compare to humans when it comes to learning different types of concepts? Could we extend this idea beyond numbers to things like emotions or social concepts? Understanding this could help improve how we interact with LLMs and help refine their learning processes further.

The Quest for Knowledge Continues

As we dig deeper into how machines learn, we uncover more about the nature of intelligence itself. Each study brings us closer to comprehending the similarities and differences between human and machine learning. Perhaps one day, we’ll be able to teach LLMs not just to talk or understand concepts but to think creatively about them.

Conclusion

In a nutshell, while LLMs are quite advanced, they still have some learning habits that remind us of our own. Their success often relies on simplicity, echoing the age-old truth that sometimes less is more. As we continue to study these models, we may find ways to make them even better at understanding the world, much like how we humans keep learning and adapting throughout our lives.

So, the next time you see a robot that can chat or understand concepts, remember that it's on a simplified learning path—just like a child learning to walk before they can run. And with any luck, we’ll keep the humor alive as we journey through this fascinating world of artificial intelligence together.

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