README.md

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## ByT5 Small Portuguese Product Reviews

#### Model Description
This is a finetuned version from ByT5 by Google for Sentimental Analysis from Product Reviews in Portuguese.

#### Training data
It was trained from products reviews from a Americanas.com. You can found the data here: https://github.com/b2wdigital/b2w-reviews01.

#### Training Procedure
It was finetuned using the Trainer Class available on the Hugging Face library. For evaluation it was used accuracy, precision, recall and f1 score.

##### Learning Rate: **2e-4**
##### Epochs: **1**
##### Colab for Finetuning: https://colab.research.google.com/drive/1EChTeQkGeXi_52lClBNazHVuSNKEHN2f
##### Colab for Metrics: https://colab.research.google.com/drive/1o4tcsP3lpr1TobtE3Txhp9fllxPWXxlw#scrollTo=PXAoog5vQaTn
#### Score:
```python
Training Set:
'accuracy': 0.8699743370402053,
'f1': 0.9072110777980404,
'precision': 0.9432919284600922,
'recall': 0.8737887200250071

Test Set:
'accuracy': 0.8680854858365782,
'f1': 0.9058389204786557,
'precision': 0.9420980625799903,
'recall': 0.8722673967229191

Validation Set:
'accuracy': 0.8662624220987031,
'f1': 0.9042450554751569,
'precision': 0.9436194311603322,
'recall': 0.8680250057883769
```

#### Goals

My true intention was totally educational, thus making available a this version of the model as a example for future proposes.

How to use
``` python
from transformers import AutoTokenizer, AutoModelForSeq2SeqLM
import torch

if torch.cuda.is_available():
    device = torch.device('cuda')
else:
    device = torch.device('cpu')
print(device)

tokenizer = AutoTokenizer.from_pretrained("HeyLucasLeao/byt5-small-pt-product-reviews")
model = AutoModelForSeq2SeqLM.from_pretrained("HeyLucasLeao/byt5-small-pt-product-reviews")
model.to(device)

def classificar_review(review):
  inputs = tokenizer([review], padding='max_length', truncation=True, max_length=512, return_tensors='pt')
  input_ids = inputs.input_ids.to(device)
  attention_mask = inputs.attention_mask.to(device)
  output = model.generate(input_ids, attention_mask=attention_mask)
  pred = np.argmax(output.cpu(), axis=1)
  dici = {0: 'Review Negativo', 1: 'Review Positivo'}
  return dici[pred.item()]
  
classificar_review(review)
```