A lightweight and high-performance model for detecting toxic comments and messages in Russian. Fine-tuned on top of cointegrated/rubert-tiny2 using threshold optimization.

Test Set Metrics

Evaluated on an independent test set of 102,308 samples (80/10/10 split).

Optimal Threshold: 0.70 (determined on the validation set).

Class	Precision	Recall	F1-Score	Support
Normal (0)	0.9997	0.9998	0.9998	101,786
Toxic (1)	0.9647	0.9425	0.9535	522

Accuracy			0.9995	102,308
Macro Avg	0.9822	0.9712	0.9766	102,308
Weighted Avg	0.9995	0.9995	0.9995	102,308

Quick Start / Usage

python

import torch
from transformers import AutoTokenizer, AutoModelForSequenceClassification

MODEL_NAME = "KvaytG/rubert-tiny2-toxic-detector"
THRESHOLD = 0.70

tokenizer = AutoTokenizer.from_pretrained(MODEL_NAME)
model = AutoModelForSequenceClassification.from_pretrained(MODEL_NAME)
model.eval()

texts = [
    "Привет! Как твои дела?"
]

inputs = tokenizer(texts, padding=True, truncation=True, max_length=128, return_tensors="pt")

with torch.no_grad():
    outputs = model(**inputs)
    probs = torch.sigmoid(outputs.logits.squeeze(-1)).cpu().numpy()

for text, prob in zip(texts, probs):
    is_toxic = bool(prob > THRESHOLD)
    print(f"Text: '{text}'")
    print(f"  Toxicity probability: {prob:.4f} | Is toxic: {is_toxic}\n")

Training Details & Hyperparameters

Base Model: cointegrated/rubert-tiny2
Dataset Size: 1,023,075 rows (80% Train / 10% Val / 10% Test)
Loss Function: Binary Focal Loss (alpha=0.75, gamma=2.0)
Optimizer: AdamW (learning_rate=3e-5, weight_decay=0.01)
LR Scheduler: Linear Schedule with Warmup (10% warmup steps)
Batch Size: 64
Max Sequence Length: 128
Epochs: 3
Mixed Precision: PyTorch AMP (Automatic Mixed Precision)

License

This model is released under the Apache License 2.0.

Citation

bibtex

@misc{kvaytg_rubert_tiny2_toxic_detector,
  author       = {KvaytG},
  title        = {RuBERT-tiny2 Toxic Text Detector},
  year         = {2026},
  publisher    = {Hugging Face},
  journal      = {Hugging Face Models},
  url          = {https://huggingface.co/KvaytG/rubert-tiny2-toxic-detector},
  note         = {High-performance lightweight toxic text detector for Russian language}
}