dfeng

Joined 15 years ago

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Traditional OCRs are trained for a single task: recognize characters. They do this through visual features (and sometimes there's an implicit (or even explicit) "language" model: see https://arxiv.org/abs/1805.09441). As such, the extent of their "hallucination", or errors, is when there's ambiguity in characters, e.g. 0 vs O (that's where the implicit language model comes in). Because they're trained with a singular purpose, you would expect their confidence scores (i.e. logprobs) to be well calibrated. Also, depending on the OCR model, you usually do a text detection (get bounding boxes) followed by a text recognition (read the characters), and so it's fairly local (you're only dealing with a small crop).

On the other hand, these VLMs are very generic models – yes, they're trained on OCR tasks, but also a dozen of other tasks. As such, they're really good OCR models, but they tend to be not as well calibrated. We use VLMs at work (Qwen2-VL to be specific), and we don't find it hallucinates that often, but we're not dealing with long documents. I would assume that as you're dealing with a larger set of documents, you have a much larger context, which increases the chances of the model getting confused and hallucinating.

Comment · 2 years ago

I would love to hear more about your experiences running a maths circle here in the UK. My two daughters are a little young (3.5 and 0.5), but this article has inspired me to get the ball rolling.

Comment · 2 years ago

I think it's because most of the compute comes from the decoding, since you're doing it autoregressively, while the encoder you just feed it through once and get the embedding. So really all it's saying is that the decoder, with N parameters, is the compute bottleneck; hence encoder-decoder with N+N has similar order compute cost as decoder with N.

Comment · 2 years ago

Wow, I did not expect to see David's notation here on HN. The only problem with the notation is that it becomes so second nature that you forget it's not standard!

Comment · 3 years ago

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Comment · 4 years ago

You're going from {0,1} to {-1,1} using indices. Seems easier to just transform via (x*2-1).

Comment · 15 years ago

the only thing keeping me from moving completely from Firefox to Chrome is Pentadactyl (http://dactyl.sourceforge.net/pentadactyl/), and better greasemonkeyscript-ability. Firefox on Mac has always had memory hogging issues, but I really can't live without my vim overlay (I've tried the Chrome alternatives, like vimium, but they pale in comparison)

As people have said about Firefox's hackability, I don't think there will be a Chrome extension as good as Pentadactyl.