Attribute	Value
Original Model	Unbabel/Tower-Plus-72B
Quantization	W4A16_ASYM (4-bit weights, 16-bit activations)
Calibration Samples	128
Sequence Length	2048
Calibration Dataset	neuralmagic/LLM_compression_calibration

Quantization Script

Dependencies

toml

dependencies = [
    "llmcompressor>=0.10.0.1",
    "protobuf>=7.34.0",
    "sentencepiece>=0.2.1",
    "compressed-tensors>=0.12.2"
]

Code

python

from transformers import AutoModelForCausalLM, AutoTokenizer
from llmcompressor.modifiers.awq import AWQModifier, AWQMapping
from llmcompressor import oneshot

from datasets import load_dataset

# envs
MODEL_PATH = "Tower-Plus-72B"
OUTPUT_PATH = "Tower-Plus-72B-awq"
DATASET_ID = "neuralmagic/LLM_compression_calibration"
NUM_CALIBRATION_SAMPLES = 128
MAX_SEQUENCE_LENGTH = 2048

# Load model and tokenizer
"""
The model is first loaded onto the cpu, as indicated through the use of None for the device_map argument in the from_pretrained method when loading the model.
uring oneshot, only one gpu is required which will be used to onload each layer for calibration in a sequential manner.
"""
model = AutoModelForCausalLM.from_pretrained(
    MODEL_PATH,
    device_map="cpu",
    dtype="auto",
)
tokenizer = AutoTokenizer.from_pretrained(MODEL_PATH)

# Load and preprocess calibration dataset
calib_dataset = load_dataset(DATASET_ID, split=f"train[:{NUM_CALIBRATION_SAMPLES}]")
calib_dataset = calib_dataset.shuffle(seed=42)

def preprocess(example):
    return {
        "text": tokenizer.apply_chat_template(
            [{"role": "user", "content": example["text"]}],
            tokenize=False,
        )
    }

calib_dataset = calib_dataset.map(preprocess)

# Tokenize calibration dataset
def tokenize(example):
    return tokenizer(
        example["text"],
        padding=False,
        max_length=MAX_SEQUENCE_LENGTH,
        truncation=True,
        add_special_tokens=False,
    )

calib_dataset = calib_dataset.map(tokenize, remove_columns=calib_dataset.column_names)

# Define AWQ quantization recipe
recipe = [
    AWQModifier(
        ignore=["lm_head"],
        scheme="W4A16_ASYM",
        targets=["Linear"],
    ),
]

# Run quantization with calibration
oneshot(
    model=model,
    tokenizer=tokenizer,
    dataset=calib_dataset,
    recipe=recipe,
    max_seq_length=MAX_SEQUENCE_LENGTH,
    num_calibration_samples=NUM_CALIBRATION_SAMPLES,
    output_dir=OUTPUT_PATH,
    pipeline="sequential",
)

This repository contains the Tower+ 72B model, as presented in the paper Tower+: Bridging Generality and Translation Specialization in Multilingual LLMs.

Project Page: https://huggingface.co/collections/Unbabel/tower-plus-6846ca452a10c0905dc03c0f

Model Description:

Tower+ 72B is build on top of Qwen 2.5 72B. The model goes through the Continuous Pretraining (CPT), Instruction Tuning (IT) and Weighted Preference Optimization (WPO). During all these stages we include parallel and multilingual data (covering 22 languages).

Developed by: Unbabel
Model type: A 72B parameter model fine-tuned on a mix of translation-related tasks as well as general instruction-following datasets that include reasoning, code instructions, etc.
Languages: German, Spanish, French, Italian, Korean, Dutch, Russian, English, Portuguese (Portugal), Portuguese (Brazilian), Spanish (Latin America), Chinese (Simplified), Chinese (Traditional), Czech, Ukrainian, Hindi, Icelandic, Japanese, Polish, Swedish, Hungarian, Romanian, Danish, Norwegian (Nynorsk), Norwegian (Bokmål), Finnish
License: CC-BY-NC-4.0
Context Size:: 131,072 tokens (recommended generation tokens 8192)

Intended uses & limitations

Tower is intended for multilingual tasks and its specially strong on translation related tasks.

Another usecase Tower works well is for creating multilingual synthethic data (for the languages it covers). You can do this either by translating instructions and the respective answers or by asking the model to create an instruction given a document as seed data.

Usage:

When using the model, make sure your prompt is formated correctly!

Also, we recommend using VLLM rather than Hugging Face.

Using on VLLM:

python

# pip install vllm
from vllm import LLM, SamplingParams
sampling_params = SamplingParams(
  best_of=1,
  temperature=0,
  max_tokens=8192,
)
llm = LLM(model="Unbabel/Tower-Plus-72B", tensor_parallel_size=4)
messages = [{"role": "user", "content": "Translate the following English source text to Portuguese (Portugal):\nEnglish: Hello world!\nPortuguese (Portugal): "}]
outputs = llm.chat(messages, sampling_params)
# Make sure your prompt_token_ids look like this
print (outputs[0].outputs[0].text)
# > Olá, mundo!

Using on Transformers:

python

# pip install transformers
# pip install accelerate
import torch
from transformers import pipeline
pipe = pipeline("text-generation", model="Unbabel/Tower-Plus-72B", device_map="auto")
# We use the tokenizer’s chat template to format each message - see https://huggingface.co/docs/transformers/main/en/chat_templating
messages = [{"role": "user", "content": "Translate the following English source text to Portuguese (Portugal):\nEnglish: Hello world!\nPortuguese (Portugal): "}]
input_ids = pipe.tokenizer.apply_chat_template(messages, tokenize=True, add_generation_prompt=True)
outputs = pipe(messages, max_new_tokens=256, do_sample=False)
print(outputs[0]["generated_text"])

Citation

If you use this model please cite our paper:

@misc{rei2025towerplus,
      title={Tower+: Bridging Generality and Translation Specialization in Multilingual LLMs}, 
      author={Ricardo Rei and Nuno M. Guerreiro and José Pombal and João Alves and Pedro Teixeirinha and Amin Farajian and André F. T. Martins},
      year={2025},
      eprint={2506.17080},
      archivePrefix={arXiv},
      primaryClass={cs.CL},
      url={https://arxiv.org/abs/2506.17080}, 
}

CarlosRCDev/Tower-Plus-72B-awq

Tower-Plus-72B AWQ (W4A16)

Quantization Model Details

Quantization Script

Dependencies

Code

Model Description:

Intended uses & limitations

Usage:

Using on VLLM:

Using on Transformers:

Citation

CarlosRCDev/
Tower-Plus-72B-awq