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Designing a mask for self-attention

To ensure that the decoder can learn to predict tokens, it's important to mask future tokens when modeling the input sequences. You'll build a mask in the form of a triangular matrix of True and False values, with False values in the upper diagonal to exclude future tokens.

This exercise is part of the course

Transformer Models with PyTorch

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Exercise instructions

  • Create a Boolean matrix, tgt_mark to mask future tokens in the attention mechanism of the decoder body.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

seq_length= 3

# Create a Boolean matrix to mask future tokens
tgt_mask = (1 - torch.____(
  torch.____(1, ____, ____), diagonal=____)
).____()

print(tgt_mask)
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