PyTorch implementation of the Transformer in Post-LN (Post-LayerNorm) and Pre-LN (Pre-LayerNorm).

Overview

Transformer-PyTorch

A PyTorch implementation of the Transformer from the paper Attention is All You Need in both Post-LN (Post-LayerNorm) and Pre-LN (Pre-LayerNorm).

Pre-LN applies LayerNorm to the input of every sublayers instead of the residual connection part in Post-LN. The proposed model architecture in the paper was in Post-LN, however the official implementation has been changed into Pre-LN version. The experiment result shows that Pre-LN transformer converges faster while doesn't even need warming up, and is less sensitive to hyperparameters. For more detail about the difference between them, check out the paper On Layer Normalization in the Transformer Architecture.

A STAR would be so nice if you like it!

Dataset

The English-German small-dataset WMT 2016 multimodal task from torchtext.

Prerequisites

  • Python3
  • PyTorch >= 1.2.0
  • torchtext
  • spacy
  • nltk
  • tqdm

Implementation Notes

  • Beam search is not supported.
  • Label smoothing is not implemented.
  • BPE is not adapted.

Usage

  • Run transformer.ipynb to download dataset and train the model.
  • Change the flag pre_lnorm to determine which to use.

Evaluation

  • Parameter settings
    • hidden size: 512
    • feed forward size: 2048
    • num head: 8
    • layer: 6
    • warm-up: 2000
    • batch size: 128

Generated Examples

Here's an example from test data:

  • source
    • eine frau verwendet eine bohrmaschine während ein mann sie fotografiert .
  • gold
    • a woman uses a drill while another man takes her picture .
  • inference
    • a woman uses an electric drill as a man takes a picture .

TODO

  • Label smoothing
  • Attention visualization

References

Owner
Jared Wang
CS @ UIUC
Jared Wang
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