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Convert MUSE from TensorFlow to PyTorch and ONNX

This repository contains code to:

  1. Convert the mUSE (Multilingual Universal Sentence Encoder) transformer model from TF Hub format to PyTorch and ONNX formats.
  2. Use these models using PyTorch and ONNX.

Important

The PyTorch model can be used not only for inference, but also for additional training and fine-tuning!

Usage

ONNX

The model was transferred from TF Hub to ONNX using the tensorflow-onnx library:

python -m tf2onnx.convert --saved-model models/universal-sentence-encoder-multilingual-large-3 --output models/model.onnx --extra_opset ai.onnx.contrib:1

The model is available for download via the link, the inference code is available here.

PyTorch

The transfer of the model from TF Hub to PyTorch was carried out through manual work of direct translation of the calculation graph (you can visualize the ONNX version of the model via Netron) to PyTorch. Notebooks convert.ipynb and onnx_inference_and_debug.ipynb were used for conversion and debugging.

The model is available in HF Models directly through torch (currently, without native support from the transformers library).

Model initialization and usage code:

import torch
from functools import partial
from src.architecture import MUSE
from src.tokenizer import get_tokenizer, tokenize

PATH_TO_PT_MODEL = "models/model.pt"
PATH_TO_TF_MODEL = "models/universal-sentence-encoder-multilingual-large-3"

tokenizer = get_tokenizer(PATH_TO_TF_MODEL)
tokenize = partial(tokenize, tokenizer=tokenizer)

model_torch = MUSE(
    num_embeddings=128010,
    embedding_dim=512,
    d_model=512,
    num_heads=8,
)
model_torch.load_state_dict(
    torch.load(PATH_TO_PT_MODEL)
)

sentence = "Hello, world!"
res = model_torch(tokenize(sentence))

Note

Currently, the checkpoint of the original TF Hub model is used for tokenization, so it is loaded in the code above.

Notes

For the TF Hub to work, the model needs the tensorflow-text library, which is available in PyPI except for Apple Silicon, so it can be downloaded here.

Python >= 3.8.