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13 votes
1 answer
3k views

When calculating self-attention for Transformer ML architectures, why do we need both a key and a query weight matrix?

I'm trying to understand the math behind Transformers, specifically self-attention. This link, and many others, gives the formula to compute the output vectors from the input embeddings as: $$Q=XW_Q,\;...
itrase's user avatar
  • 133
6 votes
2 answers
10k views

What is the length limit of Transformers?

From hugginface documentation: Transformer-based models are unable to process long sequences due to their self-attention operation How long is "long" here? 1000 inputs? 10,000 inputs? Just ...
Dylan Kerler's user avatar