What Is ChatGPT Doing ... and Why Does It Work? by Stephen Wolfram
Author:Stephen Wolfram [Wolfram, Stephen]
Language: eng
Format: azw3, epub, mobi
Publisher: Wolfram Media, Inc.
Published: 2023-03-10T00:00:00+00:00
The input is a vector of n tokens (represented as in the previous section by integers from 1 to about 50,000). Each of these tokens is converted (by a single-layer neural net ) into an embedding vector (of length 768 for GPT-2 and 12,288 for ChatGPTâs GPT-3). Meanwhile, thereâs a âsecondary pathwayâ that takes the sequence of (integer) positions for the tokens, and from these integers creates another embedding vector. And finally the embedding vectors from the token value and the token position are added together âto produce the final sequence of embedding vectors from the embedding module.
Why does one just add the token-value and token-position embedding vectors together? I donât think thereâs any particular science to this. Itâs just that various different things have been tried, and this is one that seems to work. And itâs part of the lore of neural nets thatâin some senseâso long as the setup one has is âroughly rightâ itâs usually possible to home in on details just by doing sufficient training, without ever really needing to âunderstand at an engineering levelâ quite how the neural net has ended up configuring itself.
Hereâs what the embedding module does, operating on the string hello hello hello hello hello hello hello hello hello hello bye bye bye bye bye bye bye bye bye bye :
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