Attempting to reduce the vocabulary of gpt 3

I got to develop a chatbot using GPT3 (gotta fine tune it and such) in to a llm that will be used for a chatbot. Now, it is to my understanding that the chatbot will be used for practicing conversations in different languages. Thus, I need to restrict its vocabulary to just use really basic words. My plan was to fine-tune the model so that it favors these words. However, since I would only be increasing the change of this words getting generated, I was wondering if there was an easier and more reliable way of achieving this.

Your own knowledge base in a pdf, and be very specific in the instructions you pass to the chat bot, specify in detail each step.

At startup you only verify your knowledge base called Language.pdf.

Inside this file you specify in detail what it has to do.

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Thing is that the list of accepted words surpasses the 1000 words, and just adding them to a prompt every time wouldn’t make it cost-effective.

Gotta fine tune, indeed.

The AI has been trained on massive knowledge. It doesn’t do a very good job of following instructions for either simple childrens’ writing or highly-technical writing.

It would take a massive training set to emphasize just a subset of simple words.

You also would have to train in the context of how the AI responds simply to given user inputs of your application.

The best way would be to begin with a base model … which is teaching the AI how to “chat” all over again, as that comes with nothing you might expect for chatting skills seen in ChatGPT models.


Have you tried some basic prompting techniques like “reply with the vocabulary of a 5 year old”?
If you can identify a role model and prompt the model to follow the patterns you may have a fast and easy solution at hand.

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It’s possible to change the vocabulary and writing style with just a prompt, but it takes a bit of work. Mine still isn’t 100% reliable… Second image is Easy to Read, I believe…


@PaulBellow Since fine tuning is an option, didn’t we have a post from some experienced authors how to go about it?

The combination of both should improve the results even further.


Hrm. Might be? I don’t recall off-hand, but search might bring them up.

I just wanted to mention that it can be done without fine-tuning if you’re careful with prompting, etc.

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Found it:

I just remembered you shared it earlier.


Ah, gotcha. Thanks. My brain is so fried lol…

That was indeed the post… and a good one from an author.

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Hey! I do the same thing with a Whatsapp Client that helps Spanish people learn English!

There’s 2 rules:

  1. The model understands CEFR. You can set an instruction not only at the level, but have the instruction itself written at the level.

  2. The model mirrors the user. If they speak at a level of C2 but you are asking for A1 it may deviate.


Hey @vb and @PaulBellow , I’ve been meaning to write an update to what we’ve been doing over at Future Fiction Academy. We have multiple authors with 3.5 16k fine tunes that write outputs that are indistinguishable from human writing.

Fine tunes do appear to put more attention on the tokens in the dataset. For example, have a character say “Dag nab it” and suddenly you have a higher probability that phrase will be in your output.

For the original problem of make gpt 3 write simpler, like a child:

Have a system prompt explaining what you want. Then prompts in user that match how you plan to prompt it in the future. (Note to marry the system prompt in the dataset and the user prompts later sans system prompt, make a persona like SpeakSimplySimon and then in user prompts say “Be SpeakSimplySimon” and give it the task and parameters.

If your Assistant responses are all examples of the simpler writing you want, that’s how that fine tune will respond.

Start with just 10-20 samples and see how it moves the needle. Make sure you see it making a difference because you might need to tweak the prompting and control length with maximum token output vs it naturally keeping to short responses.



Hey, thanks for stopping by to check in.

Sounds like y’all are doing great things with fine-tuning.

Do you have a link for myself or anyone interested?