---
language: es
tags:
- intent-classification
- slot-filling
- joint-bert
- spanish
- economics
- chile
- multi-head
license: mit
base_model: microsoft/mdeberta-v3-base
pipeline_tag: token-classification
---

# PIBot Joint BERT

Modelo **Joint BERT multi-head** para clasificación de intención y slot filling,
especializado en consultas sobre indicadores macroeconómicos del Banco Central de Chile.

## Arquitectura

| Componente | Detalle |
|---|---|
| Base | `microsoft/mdeberta-v3-base` |
| Task | `pibimacecv3` |
| Intent heads | 5 (`activity`, `calc_mode`, `investment`, `region`, `req_form`) |
| Slot labels | 15 (BIO) |
| Custom code | `modeling_jointbert.py`, `module.py` |

### Intent Heads

| Head | Clases | Valores |
|---|---|---|
| `activity` | 3 | `none`, `specific`, `general` |
| `calc_mode` | 4 | `original`, `prev_period`, `yoy`, `contribution` |
| `investment` | 3 | `none`, `specific`, `general` |
| `region` | 3 | `none`, `specific`, `general` |
| `req_form` | 3 | `latest`, `point`, `range` |

### Slot Entities (BIO)

Entidades extraídas: `activity`, `frequency`, `indicator`, `investment`, `period`, `region`, `seasonality`

Esquema BIO completo: 15 etiquetas (`O`, `B-*`, `I-*`).

## Uso

### Instalación

```bash
pip install torch transformers
```

### Carga del Modelo

```python
import torch
from transformers import AutoTokenizer, AutoConfig

# Cargar tokenizer y config
tokenizer = AutoTokenizer.from_pretrained("BCCh/pibert", trust_remote_code=True)
config = AutoConfig.from_pretrained("BCCh/pibert", trust_remote_code=True)

# Cargar labels desde el repo
from huggingface_hub import hf_hub_download
import os

label_dir = os.path.dirname(hf_hub_download("BCCh/pibert", "labels/slot_label.txt"))

# Leer intent y slot labels
def read_labels(path):
    with open(path) as f:
        return [line.strip() for line in f if line.strip()]

slot_labels = read_labels(os.path.join(label_dir, "slot_label.txt"))

# Preparar intent_label_lst para cada head
intent_label_lst = []
for head in ['activity', 'calc_mode', 'investment', 'region', 'req_form']:
    intent_label_lst.append(read_labels(os.path.join(label_dir, f"{head}_label.txt")))

# Cargar modelo con custom code
from transformers import AutoModelForTokenClassification
from modeling_jointbert import JointBERT  # auto-cargado con trust_remote_code

model = JointBERT.from_pretrained(
    "BCCh/pibert",
    config=config,
    intent_label_lst=intent_label_lst,
    slot_label_lst=slot_labels,
    trust_remote_code=True,
)
model.eval()
```

### Predicción

```python
text = "cuál fue el imacec de agosto 2024"
tokens = tokenizer(text, return_tensors="pt", padding=True, truncation=True)

with torch.no_grad():
    outputs = model(**tokens)
    # outputs contiene intent_logits (lista) y slot_logits
```

## Estructura del Paquete

```
model_package/
├── config.json              # Configuración BERT + task
├── model.safetensors        # Pesos del modelo
├── tokenizer.json           # Tokenizer
├── tokenizer_config.json
├── special_tokens_map.json
├── vocab.txt
├── modeling_jointbert.py    # Arquitectura JointBERT (custom)
├── module.py                # CRF y módulos auxiliares
├── __init__.py
├── README.md                # Este archivo
└── labels/
    ├── slot_label.txt
    ├── activity_label.txt
    ├── calc_mode_label.txt
    ├── investment_label.txt
    ├── region_label.txt
    ├── req_form_label.txt
```

## Datos de Entrenamiento

Entrenado con datos de consultas sobre indicadores macroeconómicos chilenos:
- **IMACEC** (Indicador Mensual de Actividad Económica)
- **PIB** (Producto Interno Bruto)
- Sectores económicos, frecuencias, períodos, regiones

## Limitaciones

- Especializado en consultas macroeconómicas del Banco Central de Chile
- Mejor rendimiento en consultas cortas (< 50 tokens)
- Requiere `trust_remote_code=True` por la arquitectura custom

## Cita

```bibtex
@misc{pibot-jointbert,
  author = {Banco Central de Chile},
  title = {PIBot Joint BERT - Multi-head Intent + Slot Filling},
  year = {2025},
  publisher = {Hugging Face},
  howpublished = {\url{https://huggingface.co/BCCh/pibert}}
}
```

## Referencias

- [BERT for Joint Intent Classification and Slot Filling](https://arxiv.org/abs/1902.10909)
- [JointBERT implementation](https://github.com/monologg/JointBERT)
- [BETO: Spanish BERT](https://github.com/dccuchile/beto)

## Licencia

MIT License