Repository General Information

Inspired by and derived from the work of Helsinki-NLP, CTranslate2, and michaelfeil!

Link to Original Model (Helsinki-NLP): Model Link
This respository was based on the work of CTranslate2.
This repository was based on the work of michaelfeil.

What is CTranslate2?

CTranslate2 is a C++ and Python library for efficient inference with Transformer models.

CTranslate2 implements a custom runtime that applies many performance optimization techniques such as weights quantization, layers fusion, batch reordering, etc., to accelerate and reduce the memory usage of Transformer models on CPU and GPU.

CTranslate2 is one of the most performant ways of hosting translation models at scale. Current supported models include:

Encoder-decoder models: Transformer base/big, M2M-100, NLLB, BART, mBART, Pegasus, T5, Whisper
Decoder-only models: GPT-2, GPT-J, GPT-NeoX, OPT, BLOOM, MPT, Llama, Mistral, Gemma, CodeGen, GPTBigCode, Falcon
Encoder-only models: BERT, DistilBERT, XLM-RoBERTa

The project is production-oriented and comes with backward compatibility guarantees, but it also includes experimental features related to model compression and inference acceleration.

CTranslate2 Benchmarks

Please note that the results presented below are only valid for the configuration used during this benchmark: absolute and relative performance may change with different settings. Tested against newstest2014 (En -> De) dataset.

The benchmark reports the number of target tokens generated per second (higher is better). The results are aggregated over multiple runs. See the benchmark scripts for more details and reproduce these numbers.

Please note that the results presented below are only valid for the configuration used during this benchmark: absolute and relative performance may change with different settings.

CPU Benchmarks for Generic Opus-MT Models

Library	Tokens per Second	Max Memory Usage	BLEU
Transformers 4.26.1 (with PyTorch 1.13.1)	147.3	2332MB	27.90
Marian 1.11.0 (int16)	330.2	5901MB	27.65
Marian 1.11.0 (int8)	355.8	4763MB	27.27
CTranslate2 3.6.0 (int16)	596.1	660MB	27.53
CTranslate2 3.6.0 (int8)	696.1	516MB	27.65

GPU Benchmarks for Generic Opus-MT Models

Library	Tokens per Second	Max GPU Memory Usage	Max Memory Usage	BLEU
Transformers 4.26.1 (with PyTorch 1.13.1)	1022.9	4097MB	2109MB	27.90
Marian 1.11.0 (float16)	3962.4	3239MB	1976MB	27.94
CTranslate2 3.6.0 (float16)	9296.7	909MB	814MB	27.9
CTranslate2 3.6.0 (int8 + float16)	8362.7	813MB	766MB	27.9

Executed with 4 threads on a c5.2xlarge Amazon EC2 instance equipped with an Intel(R) Xeon(R) Platinum 8275CL CPU.

Source to benchmark information can be found here.
Original model BLEU scores can be found here.

Internal Benchmarks

Internal testing on our end showed inference times reduced by 6x-10x on average compared the vanilla checkpoints using the transformers library. A slight reduction on BLEU scores (~5%) was also identified in comparison to the vanilla checkpoints with a few exceptions. This is likely due to several factors, one being the quantization applied. Further testing is needed from our end to better assess the reduction in translation quality. The command used to compile the vanilla checkpoint into a CTranslate2 model can be found below. Modifying this command can yield differing balances between inferencing performance and translation quality.

CTranslate2 Installation

pip install hf-hub-ctranslate2>=1.0.0 ctranslate2>=3.13.0

ct2-transformers-converter Command Used:

ct2-transformers-converter --model Helsinki-NLP/opus-mt-en-sk --output_dir ./ctranslate2/opus-mt-en-sk-ctranslate2 --force --copy_files README.md generation_config.json tokenizer_config.json vocab.json source.spm .gitattributes target.spm --quantization float16

CTranslate2 Converted Checkpoint Information:

Compatible With:

Compute Type:

compute_type=int8_float16 for device="cuda"
compute_type=int8 for device="cpu"

Sample Code - ctranslate2

Clone the repository to the working directory or wherever you wish to store the model artifacts.

git clone https://huggingface.co/gaudi/opus-mt-en-sk-ctranslate2

Take the python code below and update the 'model_dir' variable to the location of the cloned repository.

from ctranslate2 import Translator
import transformers

model_dir = "./opus-mt-en-sk-ctranslate2" # Path to model directory.
translator = Translator(
            model_path=model_dir,
            device="cuda", # cpu, cuda, or auto.
            inter_threads=1, # Maximum number of parallel translations.
            intra_threads=4, # Number of OpenMP threads per translator.
            compute_type="int8_float16", # int8 for cpu or int8_float16 for cuda.
)

tokenizer = transformers.AutoTokenizer.from_pretrained(model_dir)

source = tokenizer.convert_ids_to_tokens(tokenizer.encode("XXXXXX, XXX XX XXXXXX."))
results = translator.translate_batch([source])
target = results[0].hypotheses[0]

print(tokenizer.decode(tokenizer.convert_tokens_to_ids(target)))

Sample Code - hf-hub-ctranslate2

Derived From michaelfeil:

from hf_hub_ctranslate2 import TranslatorCT2fromHfHub, GeneratorCT2fromHfHub
from transformers import AutoTokenizer

model_name = "gaudi/opus-mt-en-sk-ctranslate2"
model = TranslatorCT2fromHfHub(
        model_name_or_path=model_name,
        device="cuda",
        compute_type="int8_float16",
        tokenizer=AutoTokenizer.from_pretrained(model_name)
)
outputs = model.generate(
    text=["XXX XX XXX XXXXXXX XXXX?", "XX XX XXXX XX XXX!"],
)
print(outputs)

License and other remarks:

License conditions are intended to be idential to original huggingface repository by Helsinki-NLP.