mBART-50 Dialogue Summarization

This model is a fine-tuned version of facebook/mbart-large-50-many-to-many-mmt for English dialogue summarization.

It takes an English multi-speaker dialogue as input and generates an English abstractive summary.

Model Details

• Base model: facebook/mbart-large-50-many-to-many-mmt
• Task: Dialogue Summarization
• Input language: English
• Output language: English
• Framework: Hugging Face Transformers
• Model type: Seq2Seq Transformer
• Fine-tuned by: Yunwoo Lee

Intended Use

This model is intended for:

• English dialogue summarization
• Research on abstractive summarization
• Educational and experimental use with sequence-to-sequence models
• Benchmarking or reproducing dialogue summarization pipelines

This model is not intended for high-stakes or production use without additional evaluation.

Training Data

The model was fine-tuned on a JSON-formatted dialogue summarization dataset with the following fields in the raw data:

• dialogue
• summary
• summary_de
• summary_zh

For this training run, only the following columns were used:

• dialogue → source text
• summary → target summary

After cleaning and filtering, the dataset sizes were:

• Train: 14,730
• Validation: 818
• Test: 819

Preprocessing

The following preprocessing steps were applied:

• Removed placeholder tokens such as <file_gif> and similar markers
• Normalized whitespace
• Preserved useful speaker information in the dialogue
• Dropped empty or invalid rows after cleaning

Tokenization Setup

• Source max length: 768
• Target max length: 64
• Source language code: en_XX
• Target language code: en_XX

Training Procedure

The model was trained with the following configuration:

• Epochs: 5
• Learning rate: 2e-5
• Optimizer: Adafactor
• Per-device train batch size: 4
• Gradient accumulation steps: 6
• Effective batch size: 24
• Per-device eval batch size: 4
• Beam size: 5
• Mixed precision: bf16
• Best model selection metric: rougeLsum

Hardware

Training was run on:

• GPU: NVIDIA A100-SXM4-40GB
• Environment: Google Colab
• PyTorch: 2.10.0+cu128

Evaluation

Evaluation was performed using ROUGE.

Validation Results

Test Results

Recommended Generation Settings

The model was evaluated using beam search.
For best results, use generation settings close to the evaluation setup:

• num_beams=5
• max_length=64
• forced_bos_token_id=en_XX

How to Use

from transformers import AutoTokenizer, AutoModelForSeq2SeqLM

model_name = "yunu919/mbart-large-dialogue-summarization"

tokenizer = AutoTokenizer.from_pretrained(model_name)
model = AutoModelForSeq2SeqLM.from_pretrained(model_name)

dialogue = """Hannah: Hey, do you have Betty's number?
Amanda: Lemme check
Amanda: Sorry, can't find it.
Amanda: Ask Larry"""

inputs = tokenizer(
    dialogue,
    return_tensors="pt",
    truncation=True,
    max_length=768,
)

outputs = model.generate(
    **inputs,
    num_beams=5,
    max_length=64,
    forced_bos_token_id=tokenizer.lang_code_to_id["en_XX"],
)

summary = tokenizer.batch_decode(outputs, skip_special_tokens=True)[0]
print(summary)