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Self-Conditioning Pre-Trained Language Models

Code style: black

This software project accompanies the paper Self-Conditioning Pre-Trained Language Models.

Installation

The requirements are listed in frozen_requirements.txt. The code has been tested using Python 3.8 on MacOS and Linux Ubuntu 18.04. Run the following for installation:

Create a virtual environment

cd <path_to_this_project>
python3 -m venv env  # make sure Python3 >= 3.6
source env/bin/activate
pip install -U pip wheel

Install selfcond (recommended for reproducibility)

pip install -r frozen_requirements.txt
python -c "import nltk; nltk.download('punkt')"

Testing

Using the "not slow" marker will avoid downloading models from the transformers repository.

pytest -m "not slow"

To test the full pipeline:

pytest

1. Finding Expert Units

We provide instructions to read responses from a model given a dataset, to compute expertise results per concept and to aggregate results.

The models are fetched from the HuggingFace Transformers repository. We currently support [gpt2, gpt-medium, gpt2-large, gpt2-xl].

1.1 Reading responses from a model

A small dataset with 1 concept (football) is provided in assets/football for model GPT2-Medium. It contains a file concept_list.csv with the concepts in the dataset, as well as the actual data inside a folder called sense (since the concepts are of the WordNet sense type, see paper). The data for each concept is provided as a json file, with positive and negative sentences. If other concepts were to be added, of a different type, we would save them in a different folder, with the appropriate name.

Run the following script to collect responses from a model. If you have a GPU, this step will run much faster than on CPU. Choose the model version with --model-name-or-path, for example --model-name-or-path gpt-medium.

python scripts/compute_responses.py \
--model-name-or-path gpt2-medium \
--data-path assets/football \
--responses-path /tmp/path_to_save_responses \
--device cuda

The script above assumes a file concept_list.csv inside the dataset path. If we want to run the script in specific concepts, pass argument --concepts with comma separated concepts and specifying the type. For example: --concepts sense/football-1_04_00__,[some_other_concept],...

The responses will be saved inside path_to_save_responses/gpt2-medium/sense/[concept]/responses.

1.2 Computing expertise per concept

The following script will compute the expertise per unit for each concept. The expertise is defined as the Average Precision (AP) achieved by a unit when its responses are considered prediction scores for the concept sentences.

python scripts/compute_expertise.py \
--root-dir /tmp/path_to_save_responses \
--model-name gpt2-medium \
--concepts assets/football/concept_list.csv

The expertise results are saved as a CSV file in path_to_save_responses/gpt2-medium/sense/[concept]/expertise. Column ap contains the expertise measured for each model unit and column on_p50 contains the median response of each unit to the positive sentences (Sec 4.2 in paper).

2. Open ended self-conditioned generation

In this step, the above computed expertise is used to generate sentences conditioned on a concept. We provide a script for open ended generation of sentences: scripts/generate_seq.py. It has several parameters to control the decoding strategy, sequence length, expertise related, etc. See --help for details.

Here we give a simple example that generates sentences with concept football for which we obtained the expertise in steps 1.x:

python scripts/generate_seq.py \
--model-name-or-path gpt2-medium \
--expertise my_results/gpt2-medium/sense/football-1_04_00__/expertise/expertise.csv \
# Generate sentences of 20 tokens
--length 20 \
# The initial context passed to the model
--prompt "Once upon a time" \
# Generate 10 sentences with random seeds ranging from 0 -> 9
--seed 0 10 \
# Final softmax temperature
--temperature 1.0 \
# Expert units are sorted according to AP
--metric ap \
# And experts are forced using the median expected value (named on_p50)
--forcing on_p50  \
# Condition the top 50 expert units
--num-units 50 \
# Just show the results, otherwise would save as a csv
--no-save

3. Replicating the paper results

3.1 Generate sentences

NOTE: First of all, the expertise for concepts woman and man should be computed using steps 1.x and the datasets in assets/gender_bias.

We provide a script that distributes the generation across multiple GPUs (if available) to speed up the experimentation (scripts/generate_batch.py).

The following example will obtain the generated sentences used in the paper.

python scripts/generate_batch.py \
--concept some_path/gpt2-medium/sense/woman-1_18_00__/expertise/expertise.csv \
--device cuda \
--prompts occupations \
--method ours \
--folder generated

The generated sentences will be stored in files generated/gen_sentences_[concept]_[context].csv (one file per concept per context).

Running FUDGE

We provide a patch to run FUDGE and obtain generated sentences compatible with our repository. To run FUDGE we must first clone the code and apply the patch git-patches/fudge.patch:

git clone https://github.com/yangkevin2/naacl-2021-fudge-controlled-generation.git fudge
cd fudge
git checkout fbedf820c306c5b3cbf684dc414b2464fc603222
# Apply patch
git am $SELFCOND/git-patches/fudge.patch

# Create a new virtualenv, since PPLM uses a frozen version of transformers
virtualenv env_fudge --python=python3.6
. env_fudge/bin/activate
pip install -r requirements.txt

Then, use script run_batch.py with the desired arguments. In the patch, we provide the BoW and prompts used in the paper in the directory topic_data. .

Running PPLM-BoW

Note that scripts/generate_batch.py also allows running PPLM-BoW. To run PPLM-BoW we must first clone the code and apply the patch git-patches/pplm.patch.

git clone https://github.com/uber-research/PPLM.git
cd PPLM
git checkout e236b8989322128360182d29a79944627957ad47
# Apply patch
git am $SELFCOND/git-patches/pplm.patch

# Create a new virtualenv, since PPLM uses a frozen version of transformers
virtualenv env_pplm --python=python3.6
. env_pplm/bin/activate
pip install -r requirements.txt

Then, use the argument --method pplm-bow when calling scripts/generate_batch.py.

3.2 Probability of generating specific words

The following step will aggregate results and obtain the probabilities of specific words appearing after the prompt. For example, in the example we compute p(he,his | do(woman, k)) and store it in a file p_he_woman.csv.

python scripts/compute_frequency.py 
# All the files with sentences to consider.
--sentences-df "some_path/generated/gen_sentences_woman_*.csv"  
# Number of characters to consider after the prompt.
--num-chars 5  
# Method can be selfcond, fudge or pplm
--method selfcond  
--out-file results/selfcond/p_he_woman.csv 
--words "he;his"

In the paper, we do this step for words he;his and she;her, and for all sentences generated for man and woman, obtaining:

  • p_he_woman.csv
  • p_she_woman.csv
  • p_he_man.csv
  • p_she_man.csv

Additionally, in our paper we report the probabilities of generating words woman;women and man:men when conditioning on woman or man respecitvely. These files should be saved as:

  • p_woman_woman.csv
  • p_man_man.csv

NOTE: In order to be able to run step 3.4, save the csv files in results/[method] as in the example.

3.3 Computing perplexity

We also provide a script to compute the perplexity of generated sentences after generation. As explained in the paper, for that we use a different model family, in this case openai-gpt.

python scripts/compute_perplexity.py 
--model-name-or-path openai-gpt 
--sentences-df some_path/generated/gen_sentences_man*.csv
--device cuda 
# Method can be selfcond, fudge or pplm
--method selfcond

The results will be saved in a file with the same name as --sentences-df but ending with _ppl.csv instead.

Aggregating the perplexity

We have an additional script that aggregates the perplexity computed above. Example of usage:

python scripts/aggregate_perplexities.py 
--ppl-woman some_path/generated/gen_sentences_woman*ppl.csv
--ppl-man some_path/generated/gen_sentences_man*ppl.csv
# Method can be selfcond, fudge or pplm
--method selfcond 
--out-dir some_path/results

The aggregated perplexities will be saved as pl_woman.csv and ppl_man.csv in results/[method].

3.4 Computing Self-BLEU score

Run the following script, that will compute the Self-BLEU score for all the generated sentences passed as --sentences-df. To speed up the computation (at the expense of a higher variance in the score) one can reduce both --num-sample and --num-reps.

python scripts/compute_selfbleu.py
--sentences-df some_path/generated/gen_sentences_*.csv
# Method can be selfcond, fudge or pplm
--method selfcond 
--out-dir some_path/results
# Number of sentences randomly sampled to compute the score
--num-sample 100
# Number of repetitions performed, the reported score will be the average
--num-reps 1000
--ngram 3 4

The Self-BLEU scores will be saved in selfbleu_woman.csv and selfbleu_man.csv in results/[method].

3.5 The figures

The script all_plots.py will produce all the figures in the paper. It assumes all the results in csv format in a single folder. In the steps above we used results as our main results folder. All figures will be saved in the directory specified by -o.

Example of usage:

python scripts/all_plots.py  -i results -o figures

If you need dark figures, set the variable DARK_PLOTS=True in the script.

Citation

@article{suau2022selfcond,
  title={Self-Conditioning Pre-Trained Language Models},
  author={Suau, Xavier and Zappella, Luca and Apostoloff, Nicholas},
  journal={International Conference on Machine Learning},
  year={2022}
}

Contact

Xavier Suau Cuadros (xsuaucuadros@apple.com)

Luca Zappella (lzappella@apple.com)

Nick Apostoloff (napostoloff@apple.com)