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PPLM

This repository contains code to run the Plug and Play Language Model (PPLM), as described in this blog post and arXiv paper. A demo and Colab notebook are also available.

Note: If you are planning on using PPLM as a baseline, and would like to use the parameters listed in the paper's Appendix, please use the LM and the discriminator from this folder. Alternatively, tune the hyperparamters on your own if you are using the code/models in the main directory and/or the 🤗/Transformers for a fair comparison (the optimal parameters for these models/discriminators are roughly off by a factor of 5 from those used in the paper).

PPLM is also integrated into the 🤗/Transformers repository.

header image

Plug and Play Language Models: a Simple Approach to Controlled Text Generation

Authors: Sumanth Dathathri, Andrea Madotto, Janice Lan, Jane Hung, Eric Frank, Piero Molino, Jason Yosinski, and Rosanne Liu

PPLM allows a user to flexibly plug in one or more tiny attribute models representing the desired steering objective into a large, unconditional language model (LM). The method has the key property that it uses the LM as is—no training or fine-tuning is required—which enables researchers to leverage best-in-class LMs even if they do not have the extensive hardware required to train them.

See also our arXiv paper, blog post, and try it out for yourself with no setup using the Colab notebook.

Setup

pip install -r requirements.txt

Citation

@inproceedings{
Dathathri2020Plug,
title={Plug and Play Language Models: A Simple Approach to Controlled Text Generation},
author={Sumanth Dathathri and Andrea Madotto and Janice Lan and Jane Hung and Eric Frank and Piero Molino and Jason Yosinski and Rosanne Liu},
booktitle={International Conference on Learning Representations},
year={2020},
url={https://openreview.net/forum?id=H1edEyBKDS}
}

PPLM-BoW

Example command for bag-of-words control

python run_pplm.py -B military --cond_text "The potato" --length 50 --gamma 1.5 --num_iterations 3 --num_samples 10 --stepsize 0.03 --window_length 5 --kl_scale 0.01 --gm_scale 0.99 --colorama --sample

Tuning hyperparameters for bag-of-words control

  1. Increase --stepsize to intensify topic control, and decrease its value to soften the control. --stepsize 0 recovers the original uncontrolled GPT-2 model.

  2. If the language being generated is repetitive (For e.g. "science science experiment experiment"), there are several options to consider:
    a) Reduce the --stepsize
    b) Increase --kl_scale (the KL-loss coefficient) or decrease --gm_scale (the gm-scaling term)
    c) Add --grad-length xx where xx is an (integer <= length, e.g. --grad-length 30).

PPLM-Discrim

Example command for discriminator based sentiment control

python run_pplm.py -D sentiment --class_label 2 --cond_text "My dog died" --length 50 --gamma 1.0 --num_iterations 10 --num_samples 10 --stepsize 0.04 --kl_scale 0.01 --gm_scale 0.95 --sample

Tuning hyperparameters for discriminator control

  1. Increase --stepsize to intensify topic control, and decrease its value to soften the control. --stepsize 0 recovers the original uncontrolled GPT-2 model.

  2. Use --class_label 3 for negative, and --class_label 2 for positive

The discriminator and the GPT-2 model in the root directory are different from those used for the analysis in the paper. Code and models corresponding to the paper can be found here.

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Plug and Play Language Model implementation. Allows to steer topic and attributes of GPT-2 models.

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