import streamlit as st
from transformers import pipeline
import torch
import matplotlib.pyplot as plt
import numpy as np
  
from transformers import BertForSequenceClassification, BertTokenizer

model = BertForSequenceClassification.from_pretrained("RuudVelo/dutch_news_clf_bert_finetuned")

tokenizer = BertTokenizer.from_pretrained("RuudVelo/dutch_news_clf_bert_finetuned")


# Title
st.title("Dutch news article classification")

st.write("This app classifies a Dutch news article into one of 9 pre-defined* article categories")

st.image('dataset-cover_articles.jpeg', width=150)

text = st.text_area('Please type/copy/paste text of the Dutch article and click Submit')

if st.button('Submit'):
    with st.spinner('Generating a response...'):
        encoding = tokenizer(text, return_tensors="pt")
        outputs = model(**encoding)
        predictions = outputs.logits.argmax(-1)
        number = predictions[0].cpu().detach().numpy()
        probabilities = torch.nn.functional.softmax(outputs.logits, dim=-1)
   
        fig = plt.figure(figsize=(10,4))
        ax = fig.add_axes([0,0,1,1])
        labels_plot = ['Binnenland', 'Buitenland' ,'Cultuur & Media' ,'Economie' ,'Koningshuis',
 'Opmerkelijk' ,'Politiek', 'Regionaal nieuws', 'Tech']
        probs_plot = probabilities[0].cpu().detach().numpy()*100
   
        ax.barh(labels_plot,probs_plot)
        ax.set_title("Predicted article category probability", fontsize=20)
        ax.set_xlabel("Probability (%)", fontsize=16)
        ax.set_ylabel("Predicted category", fontsize=16)
        
        # change the fontsize
        #ax.set_xticklabels(fontsize=14)
        ax.set_yticklabels(labels_plot, fontsize=14)
        
        st.pyplot(fig)
        
        st.write('The predicted category is: **{}** with a probability of: **{:.1f}%**'.format(labels_plot[number],(probs_plot[predictions])*1))

st.write("The pre-defined categories are Binnenland, Buitenland, Cultuur & Media, Economie , Koningshuis, Opmerkelijk, Politiek, Regionaal nieuws en Tech")
st.write("The model for this app has been trained using data from Dutch news articles published by NOS. More information regarding the dataset can be found at https://www.kaggle.com/maxscheijen/dutch-news-articles")
#st.write('\n')
st.write('Model performance details can be found at https://huggingface.co/RuudVelo/dutch_news_clf_bert_finetuned')