import streamlit as st
import pandas as pd

from transformers import pipeline

@st.cache(allow_output_mutation=True)
def get_model(model):
	return pipeline("fill-mask", model=model, top_k=100)#seto maximum of tokens to be retrieved after each inference to model

HISTORY_WEIGHT = 100 # set history weight (if found any keyword from history, it will priorities based on its weight)

st.caption("This is a simple auto-completion where the next token is predicted per probability and a weigh if appears in user's history")

history_keyword_text = st.text_input("Enter users's history keywords (optional, i.e., 'Gates')", value="Gates")

text = st.text_input("Enter a text for auto completion...", value='Where is Bill')

model = st.selectbox("choose a model", ["roberta-base", "bert-base-uncased"])

data_load_state = st.text('Loading model...')
nlp = get_model(model)

if text:
    data_load_state = st.text('Inference to model...')
    result = nlp(text+' '+nlp.tokenizer.mask_token)
    data_load_state.text('')
    for index, r in enumerate(result):
        if r['token_str'].lower().strip() in history_keyword_text.lower().strip() and len(r['token_str'].lower().strip())>1:
            #found from history, then increase the score of tokens
            result[index]['score']*=HISTORY_WEIGHT
            
    #sort the results        
    df=pd.DataFrame(result).sort_values(by='score', ascending=False)
    #show the results as a table
    st.table(df)