Component	Description
Encoder	`Snowflake/snowflake-arctic-embed-l-v2.0` — 568M params, 1024-dim embeddings, loaded from HuggingFace at inference
Classifier	`harassment_arctic_mlp.joblib` — sklearn MLP (512→128, ReLU) trained on frozen Arctic embeddings, bundled in this repo (~7 MB)

The encoder is not fine-tuned — only the MLP head was trained. This keeps the classifier small and the encoder swappable.

Performance

Evaluated on a stratified held-out test set (15% of annotated French comments):

Metric	Score
F1	0.6916
Precision	0.6852
Recall	0.6981
Accuracy	0.7130

Comparison with other frozen-embedding approaches on the same test set:

Model	Classifier	F1
Arctic	MLP	0.6916
Arctic	LogReg	0.6903
Harrier (270M)	LightGBM	0.6729
jina-nano (239M)	LightGBM	0.6573
jina-small (677M)	MLP	0.6195

Usage

python

from huggingface_hub import hf_hub_download
from sentence_transformers import SentenceTransformer
import joblib
import numpy as np

# Load components
clf = joblib.load(hf_hub_download(
    repo_id="gregco/balance-tes-haters-classifier",
    filename="harassment_arctic_mlp.joblib",
))
encoder = SentenceTransformer("Snowflake/snowflake-arctic-embed-l-v2.0")

def predict(text: str) -> int:
    """Returns 1 (harassment) or 0 (benign)."""
    X = encoder.encode([text], convert_to_numpy=True)
    return int(clf.predict(X)[0])

def predict_proba(text: str) -> float:
    """Returns harassment probability between 0 and 1."""
    X = encoder.encode([text], convert_to_numpy=True)
    return float(clf.predict_proba(X)[0, 1])

Training Data

Real annotations: French social media comments manually annotated via the Balance Tes Haters platform, covering 11 harassment categories (injure, menaces, doxxing, incitation à la haine, etc.)
Split: 70% train / 15% val / 15% test (stratified)
The MLP was trained on the real split only (no synthetic augmentation for this checkpoint)

Categories detected

The model collapses all harassment categories into a single binary label:

0 — Absence de cyberharcèlement
1 — Any of: Cyberharcèlement, Injure, Diffamation, Menaces, Doxxing, Incitation au suicide, Incitation à la haine, Cyberharcèlement à caractère sexuel, and others

Limitations

Trained exclusively on French comments — not suitable for other languages
Sarcasm and context-dependent harassment may be misclassified
Should be used as a triage tool, not a final decision system — human review recommended for borderline cases

Dependencies

pip install sentence-transformers scikit-learn huggingface_hub