Why ChatGPT lies in some languages more than othersReading Time: 3 minutes
AI is very much a work in progress, and we should all be wary of its potential for confidently spouting misinformation. But it seems to be more likely to do so in some languages than others. Why is that?
The question comes in the wake of a report by NewsGuard, a misinformation watchdog, that shows how ChatGPT repeats more inaccurate information in Chinese dialects than when asked to do so in English.
In their tests, they ‘tempted’ the language model by asking it to write news articles regarding various false claims allegedly advanced by the Chinese government — such as that protests in Hong Kong were staged by U.S.-associated agents provocateurs.
When asked to do so in English (both prompt and output), ChatGPT only complied in one out of seven examples: specifically, it generated an article that echoed the official Chinese government line that mass detention of Uyghur people in the country is in fact a vocational and educational effort.
But when the prompts and outputs were in simplified Chinese and traditional Chinese (the two most common written languages in mainland China, Hong Kong, Taiwan, and Macau), ChatGPT offered disinfo-tinged rhetoric every single time.
When asked in English about the Hong Kong protests, the model responded in part:
Whereas both responses when asked and answered in Chinese script were along the lines of:
An interesting, and troubling, outcome. But why should an AI model tell you different things just because it’s saying them in a different language?
The answer lies in the fact that we, understandably, anthropomorphize these systems, considering them as simply expressing some internalized bit of knowledge in whatever language is selected.
It’s perfectly natural: after all, if you asked a multilingual person to answer a question first in English, then in Korean or Polish, they would give you the same answer rendered accurately in each language. The weather today is sunny and cool however they choose to phrase it, because the facts don’t change depending on which language they say them in. The idea is separate from the expression.
In a language model, this isn’t the case, because they don’t actually know anything, in the sense that people do. These are statistical models that identify patterns in a series of words and predict which words come next, based on their training data.
Do you see what the issue is? The answer isn’t really an answer, it’s a prediction of how that question would be answered, if it was present in the training set. (Here’s a longer exploration of that aspect of today’s most powerful LLMs.)
Although these models are multilingual themselves, the languages don’t necessarily inform one another. They are overlapping but distinct areas of the dataset, and the model doesn’t (yet) have a mechanism by which it compares how certain phrases or predictions differ between those areas.
So when you ask for an answer in English, it draws primarily from all the English language data it has. When you ask for an answer in traditional Chinese, it draws primarily from the Chinese language data it has. How and to what extent these two piles of data inform one another or the resulting outcome is not clear, but at present NewsGuard’s experiment shows that they at least are quite independent.
What does that mean to people who must work with AI models in languages other than English, which makes up the vast majority of training data? It’s just one more caveat to keep in mind when interacting with them. It’s already hard enough to tell whether a language model is answering accurately, hallucinating wildly, or even regurgitating exactly — and adding the uncertainty of a language barrier in there only makes it harder.
The example with political matters in China is an extreme one, but you can easily imagine other cases where, say, when asked to give an answer in Italian, it draws on and reflects the Italian content in its training data set. That may well be a good thing in some cases!
This doesn’t mean that large language models are only useful in English, or in the language best represented in their dataset. No doubt ChatGPT would be perfectly usable for less politically fraught queries, since whether it answers in Chinese or English, much of its output will be equally accurate.
But the report raises an interesting point worth considering in the future development of new language models: not just whether propaganda is more present in one language or another, but other, more subtle biases or beliefs. It reinforces the notion that when ChatGPT or some other model gives you an answer, it’s always worth asking yourself (not the model) where that answer came from and if the data it is based on is itself trustworthy.
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