stem/AI/Neural Networks/Transformers
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STEM/AI/Neural Networks/RNN/VQA.md
STEM/AI/Neural Networks/SLP/Least Mean Square.md
STEM/AI/Neural Networks/SLP/Perceptron Convergence.md
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STEM/AI/Neural Networks/Transformers/LLM.md
STEM/AI/Neural Networks/Transformers/Transformers.md
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Attention.md vault backup: 2023-05-31 22:21:56 2023-05-31 22:21:56 +01:00
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Transformers.md vault backup: 2023-06-05 17:01:29 2023-06-05 17:01:29 +01:00

  • Attention
    • Weighting significance of parts of the input
      • Including recursive output
  • Similar to RNNs
    • Process sequential data
    • Translation & text summarisation
    • Differences
      • Process input all at once
    • Largely replaced LSTM and gated recurrent units (GRU) which had attention mechanics
  • No recurrent structure

transformer-arch

Examples

  • BERT
    • Bidirectional Encoder Representations from Transformers
    • Google
  • Original GPT

transformers-explained-visually-part-1-overview-of-functionality

Architecture

Input

  • Byte-pair encoding tokeniser
  • Mapped via word embedding into vector
    • Positional information added

Encoder/Decoder

  • Similar to seq2seq models
  • Create internal representation
  • Encoder layers
    • Create encodings that contain information about which parts of input are relevant to each other
    • Subsequent encoder layers receive previous encoding layers output
  • Decoder layers
    • Takes encodings and does opposite
    • Uses incorporated textual information to produce output
    • Has attention to draw information from output of previous decoders before drawing from encoders
  • Both use Attention
  • Both use MLP layers for additional processing of outputs
    • Contain residual connections & layer norm steps