Production-ready LASER multilingual embeddings
laserembeddings is a pip-packaged, production-ready port of Facebook Research's LASER (Language-Agnostic SEntence Representations) to compute multilingual sentence embeddings.
LASER is a collection of scripts and models created by Facebook Research to compute multilingual sentence embeddings for zero-shot cross-lingual transfer.
What does it mean? LASER is able to transform sentences into language-independent vectors. Similar sentences get mapped to close vectors (in terms of cosine distance), regardless of the input language.
That is great, especially if you don't have training sets for the language(s) you want to process: you can build a classifier on top of LASER embeddings, train it on whatever language(s) you have in your training data, and let it classify texts in any language.
The aim of the package is to make LASER as easy-to-use and easy-to-deploy as possible: zero-config, production-ready, etc., just a two-liner to install.
pip install laserembeddings
Downloading the pre-trained models
python -m laserembeddings download-models
This will download the models to the default
data directory next to the source code of the package. Use
python -m laserembeddings download-models path/to/model/directory to download the models to a specific location
from laserembeddings import Laser laser = Laser() embeddings = laser.embed_sentences( ['let your neural network be polyglot', 'use multilingual embeddings!'], lang='en') # lang is used for tokenization # embeddings is a N*1024 (N = number of sentences) NumPy array
If you downloaded the models into a specific directory:
from laserembeddings import Laser path_to_bpe_codes = ... path_to_bpe_vocab = ... path_to_encoder = ... laser = Laser(path_to_bpe_codes, path_to_bpe_vocab, path_to_encoder) # you can also supply file objects instead of file paths
If you want to pull the models from S3:
from io import BytesIO, StringIO from laserembeddings import Laser import boto3 s3 = boto3.resource('s3') MODELS_BUCKET = ... f_bpe_codes = StringIO(s3.Object(MODELS_BUCKET, 'path_to_bpe_codes.fcodes').get()['Body'].read().decode('utf-8')) f_bpe_vocab = StringIO(s3.Object(MODELS_BUCKET, 'path_to_bpe_vocabulary.fvocab').get()['Body'].read().decode('utf-8')) f_encoder = BytesIO(s3.Object(MODELS_BUCKET, 'path_to_encoder.pt').get()['Body'].read()) laser = Laser(f_bpe_codes, f_bpe_vocab, f_encoder)
What are the differences with the original implementation?
Some dependencies of the original project have been replaced with pure-python dependencies, to make this package easy to install and deploy.
Here's a summary of the differences:
|Part of the pipeline||LASER dependency (original project)||laserembeddings dependency (this package)||Reason|
|Normalization / tokenization||Moses||Sacremoses||Moses is implemented in Perl|
|BPE encoding||fastBPE||subword-nmt||fastBPE cannot be installed via pip and requires compiling C++ code|
The following features have not been implemented yet:
- romanize, needed to process Greek (el)
- Chinese text segmentation, needed to process Chinese (zh, cmn, wuu and yue)
- Japanese text segmentation, needed to process Japanese (ja, jpn)
Will I get the exact same embeddings?
For most languages, in most of the cases, yes.
Some slight (and not so slight 🙄) differences exist for some languages due to differences in the implementation of the Tokenizer.
An exhaustive comparison of the embeddings generated with LASER and laserembeddings is automatically generated and will be updated for each new release.
How can I train the encoder?
You can't. LASER models are pre-trained and do not need to be fine-tuned. The embeddings are generic and perform well without fine-tuning. See https://github.com/facebookresearch/LASER/issues/3#issuecomment-404175463.
Thanks a lot to the creators of LASER for open-sourcing the code of LASER and releasing the pre-trained models. All the kudos should go to them 👏.
First you'll need to checkout this repository and install it (in a virtual environment if you want). Also make sure to have Poetry installed.
Then, to run the tests:
poetry run pytest
Testing the similarity between the embeddings computed with LASER and laserembeddings
First, download the test data.
python -m laserembeddings download-test-data
👉 If you want to know more about the contents and the generation of the test data, check out the laserembeddings-test-data repository.
Then, run the test with
SIMILARITY_TEST env. variable set to
SIMILARITY_TEST=1 poetry run pytest tests/test_laser.py
Now, have a coffee ☕️ and wait for the test to finish.
The similarity report will be generated here: tests/report/comparison-with-LASER.md.
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