A very simple library that helps you find the best-suited language model for your NLP task. Developed at Humboldt University of Berlin.

---

Quick Start | Tutorials | Demonstration Paper | Approach Paper

---

The problem: There are too many pre-trained language models (LMs) out there. But which one of them is best for your NLP classification task? Since fine-tuning LMs is costly, it is not possible to try them all!

The solution: Transferability estimation with TransformerRanker!

---

TransformerRanker is a library that

• quickly finds the best-suited language model for a given NLP classification task. All you need to do is to select a dataset and a list of pre-trained language models (LMs) from the 🤗 HuggingFace Hub. TransformerRanker will quickly estimate which of these LMs will perform best on the given task!

• efficiently performs layerwise analysis of LMs. Transformer LMs have many layers. Use TransformerRanker to identify which intermediate layer is best-suited for a downstream task!

---

Quick Start

To install from pip, simply do:

pip install transformer-ranker

Example 1: Find the best LM for Named Entity Recognition

Let's say we want to find the best LM for English Named Entity Recognition (NER) on the popular CoNLL-03 dataset.

To keep this example simple, we use TransformerRanker to only choose between two models: bert-base-cased and bert-base-uncased.

The full snippet to do so is as follows:

from datasets import load_dataset
from transformer_ranker import TransformerRanker

# Step 1: Load the CoNLL-03 dataset from HuggingFace
dataset = load_dataset('conll2003')

# Step 2: Define the LMs to choose from 
language_models = ["bert-base-cased", "bert-base-uncased"]

# Step 3: Initialize the ranker with the dataset 
ranker = TransformerRanker(dataset, dataset_downsample=0.2)

# ... and run the ranker to obtain the ranking
results = ranker.run(language_models, batch_size=64)

If you run this snippet for the first time, it will first download the CoNLL-03 dataset from HuggingFace, and also download the two transformer LMs. It will then conduct the estimation for the two LMs. On a GPU-enabled Google Colab notebook, this should only take a minute or two.

Print the results by doing

print(results)

This should print:

Rank 1. bert-base-uncased: 2.5935
Rank 2. bert-base-cased: 2.5137

This indicates that the uncased variant of BERT is likely to perform better on CoNLL-03!

Example 2: Really find the best LM

The first example was kept simple: we only chose between two LMs. But in practical use cases, you might want to choose between dozens of LMs.

To help you get started, we compiled two lists of popular LMs that in our opinion are good LMs to try:

1. A 'base' list that contains 17 popular models of medium size.
2. A 'large' list that contains popular models of larger size.

To find the best LM for English NER among 17 base LMs, use the following snippet:

from datasets import load_dataset
from transformer_ranker import TransformerRanker, prepare_popular_models

# Step 1: Load the CoNLL-03 dataset from HuggingFace
dataset = load_dataset('conll2003')

# Step 2: Use our list of 17 'base' LMs as candidates 
language_models = prepare_popular_models('base')

# Step 3: Initialize the ranker with the dataset 
ranker = TransformerRanker(dataset, dataset_downsample=0.2)

# ... and run the ranker to obtain the ranking
results = ranker.run(language_models, batch_size=64)

# print the ranking
print(results)

Done! This will print:

Rank 1. microsoft/deberta-v3-base: 2.6739
Rank 2. google/electra-base-discriminator: 2.6115
Rank 3. microsoft/mdeberta-v3-base: 2.6099
Rank 4. roberta-base: 2.5919
Rank 5. typeform/distilroberta-base-v2: 2.5834
Rank 6. sentence-transformers/all-mpnet-base-v2: 2.5709
Rank 7. bert-base-cased: 2.5137
Rank 8. FacebookAI/xlm-roberta-base: 2.4894
Rank 9. Twitter/twhin-bert-base: 2.4261
Rank 10. german-nlp-group/electra-base-german-uncased: 2.2517
Rank 11. distilbert-base-cased: 2.1989
Rank 12. sentence-transformers/all-MiniLM-L12-v2: 2.1957
Rank 13. Lianglab/PharmBERT-cased: 2.1945
Rank 14. google/electra-small-discriminator: 1.945
Rank 15. KISTI-AI/scideberta: 1.9175
Rank 16. SpanBERT/spanbert-base-cased: 1.7301
Rank 17. dmis-lab/biobert-base-cased-v1.2: 1.5784

This ranking gives you an indication which models might perform best on CoNLL-03. Accordingly, you can exclude the lower-ranked models and focus on the top-ranked models.

Note: Doing estimation for all 17 base models will take about 15 minutes on a GPU-enabled Colab Notebook (most time is spent downloading the models if you don't already have them locally).

Tutorials

We provide tutorials to provide an introduction into the library and key concepts:

1. Tutorial 1: Library Walkthrough
2. Tutorial 2: Learn by Example
3. Tutorial 3: Advanced

Cite

Please cite the following paper when using TransformerRanker or building upon our work:

@misc{garbas2024transformerrankertoolefficientlyfinding,
      title={TransformerRanker: A Tool for Efficiently Finding the Best-Suited Language Models for Downstream Classification Tasks}, 
      author={Lukas Garbas and Max Ploner and Alan Akbik},
      year={2024},
      eprint={2409.05997},
      archivePrefix={arXiv},
      primaryClass={cs.CL},
      url={https://arxiv.org/abs/2409.05997}, 
}

Contact

Please email your questions or comments to Lukas Garbas

Contributing

Thanks for your interest in contributing! There are many ways to get involved; check these open issues for specific tasks.

License

MIT