GPT3 is a large language model that generates text based on its training on a massive dataset of 300 billion tokens. It outputs text one token at a time, influenced by input text. The model encodes what it learns in 175 billion parameters and has a context window of 2048 tokens. The core calculations happen within 96 transformer decoder layers, each with 1.8 billion parameters. Words are converted to vectors, a prediction is made, and the result is converted back to a word. The input flows through the layer stack, with each word fed back into the model. Priming examples are included as input. Fine-tuning can update model weights to improve performance for specific tasks.

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