ChatGPT is based on a standard large language model, which was then finetuned to follow instructions and engage in dialogue. Software such as `gpt-2-simple` allows you to do the same without coding knowledge. However, you will need a lot of conversational data for a good result, usually on the order of megabytes. Additionally, ChatGPT uses a model larger than any in the GPT-2 series, as well as advanced techniques such as RLHF (Reinforcement Learning from Human Feedback), so your version is unlikely to be as effective as ChatGPT itself.
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