MorphoArabia at BAREC 2025 Shared Task: A Hybrid Architecture with Morphological Analysis for Arabic Readability Assessmen

This repository contains the official models and results for MorphoArabia, the submission to the BAREC 2025 Shared Task on Arabic Readability Assessment.

By: Fatimah Mohamed Emad Elden

Cairo University

---

Model Description

This project introduces a morphologically-aware approach for assessing the readability of Arabic text. The system is built around a fine-tuned regression model designed to process morphologically analyzed text. For the Constrained and Open tracks of the shared task, this core model is extended into a hybrid architecture that incorporates seven engineered lexical features.

A key element of this system is its deep morphological preprocessing pipeline, which uses the CAMEL Tools d3tok analyzer. This allows the model to capture linguistic complexities that are often missed by surface-level tokenization methods. This approach proved to be highly effective, achieving a peak Quadratic Weighted Kappa (QWK) score of 84.2 on the strict sentence-level test set.

The model predicts a readability score on a 19-level scale, from 1 (easiest) to 19 (hardest), for a given Arabic sentence or document.

---

🚀 How to Use

You can use the fine-tuned models directly with the transformers library pipeline for text-regression. The following example uses the best-performing model from the Strict track.

from transformers import pipeline

# Load the regression pipeline
# This model is the best performer for the Strict track
# It's also the base model for the other tracks.
regressor = pipeline(
    "text-regression",
    model="FatimahEmadEldin/MorphoArabia-CAMEL-BERT-BAREC-Strict-Sentence"
)

# Example sentence in Arabic
sentence = "أليست هذه العاطفة التي نخافها ونرتجف لمرورها في صدورنا جزءا من الناموس الكلي"
# (Translation: "Isn't this emotion, which we fear and tremble at its passing in the chests, a part of the universal law?")

# Get the readability score
results = regressor(sentence)

# The output is a score between 1 and 19
predicted_score = results[0]['score']

print(f"Sentence: {sentence}")
print(f"Predicted Readability Score: {predicted_score:.2f}")

---

⚙️ Training Procedure

The system employs two distinct architectures based on the track's constraints:

• Strict Track: This track uses a base regression model, CAMeL-Lab/readability-arabertv2-d3tok-reg, fine-tuned directly on the BAREC dataset.
• Constrained and Open Tracks: These tracks utilize a hybrid model. This architecture combines the deep contextual understanding of the Transformer with explicit numerical features. The final representation for a sentence is created by concatenating the Transformer's [CLS] token embedding with a 7-dimensional vector of engineered lexical features derived from the SAMER lexicon.

A critical component of the system is its preprocessing pipeline, which leverages the CAMEL Tools d3tok format. The d3tok analyzer performs a deep morphological analysis by disambiguating words in context and then segmenting them into their constituent morphemes.

Frameworks

• PyTorch
• Hugging Face Transformers

---

📊 Evaluation Results

The models were evaluated on the blind test set provided by the BAREC organizers. The primary metric for evaluation is the Quadratic Weighted Kappa (QWK), which penalizes larger disagreements more severely.

Final Test Set Scores (QWK)

*Document-level dev scores are based on the performance of the sentence-level model on the validation set.

---

📜 Citation

If you use the work, please cite the paper:

coming soon
}