Google Colab is not sufficient to train a model on the scale of ChatGPT. However, you can use it to prompt-tune (a weaker form of fine-tuning) a model on the scale of GPT-J with 6 billion parameters, thanks to their TPU (Tensor Processing Unit) offering. Alternatively, you can fully finetune a model, but that would require more VRAM and thus can only be done with smaller models, such as some versions of GPT-2.
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