from os import write import time import pandas as pd import base64 from typing import Sequence import streamlit as st from sklearn.metrics import classification_report # from models import create_nest_sentences, load_summary_model, summarizer_gen, load_model, classifier_zero import models as md from utils import plot_result, plot_dual_bar_chart, examples_load, example_long_text_load import json ex_text, ex_license, ex_labels, ex_glabels = examples_load() ex_long_text = example_long_text_load() # if __name__ == '__main__': st.markdown("### Long Text Summarization & Multi-Label Classification") st.write("This app summarizes and then classifies your long text with multiple labels using [BART Large MNLI](https://huggingface.co/facebook/bart-large-mnli). The keywords are generated using [KeyBERT](https://github.com/MaartenGr/KeyBERT).") st.write("__Inputs__: User enters their own custom text and labels.") st.write("__Outputs__: A summary of the text, likelihood percentages for each label and a downloadable csv of the results. \ Includes additional options to generate a list of keywords and/or evaluate results against a list of ground truth labels, if available.") example_button = st.button(label='See Example') if example_button: example_text = ex_long_text #ex_text display_text = 'Excerpt from Frankenstein:' + example_text + '"\n\n' + "[This is an excerpt from Project Gutenberg's Frankenstein. " + ex_license + "]" input_labels = ex_labels input_glabels = ex_glabels else: display_text = '' input_labels = '' input_glabels = '' with st.form(key='my_form'): text_input_method = st.radio( "Text Input Method", ('Free form text', 'CSV') ) if text_input_method == "Free form text": text_input = st.text_area("Input any text you want to summarize & classify here (keep in mind very long text will take a while to process):", display_text) else: uploaded_file = st.file_uploader("Choose a CSV file", help='Upload a CSV file with the following columns: ID, Text') gen_keywords = st.radio( "Generate keywords from text?", ('Yes', 'No') ) if text_input == display_text and display_text != '': text_input = example_text labels = st.text_input('Enter possible topic labels, which can be either keywords and/or general themes (comma-separated):',input_labels, max_chars=1000) labels = list(set([x.strip() for x in labels.strip().split(',') if len(x.strip()) > 0])) glabels = st.text_input('If available, enter ground truth topic labels to evaluate results, otherwise leave blank (comma-separated):',input_glabels, max_chars=1000) glabels = list(set([x.strip() for x in glabels.strip().split(',') if len(x.strip()) > 0])) threshold_value = st.slider( 'Select a threshold cutoff for matching percentage (used for ground truth label evaluation)', 0.0, 1.0, (0.5)) submit_button = st.form_submit_button(label='Submit') st.write("_For improvments/suggestions, please file an issue here: https://github.com/pleonova/multi-label-summary-text_") with st.spinner('Loading pretrained models...'): start = time.time() summarizer = md.load_summary_model() s_time = round(time.time() - start,4) start = time.time() classifier = md.load_model() c_time = round(time.time() - start,4) start = time.time() kw_model = md.load_keyword_model() k_time = round(time.time() - start,4) st.success(f'Time taken to load various models: {k_time}s for KeyBERT model & {s_time}s for BART summarizer mnli model & {c_time}s for BART classifier mnli model.') if submit_button or example_button: if len(text_input) == 0: st.error("Enter some text to generate a summary") else: with st.spinner('Breaking up text into more reasonable chunks (transformers cannot exceed a 1024 token max)...'): # For each body of text, create text chunks of a certain token size required for the transformer nested_sentences = md.create_nest_sentences(document = text_input, token_max_length = 1024) # For each chunk of sentences (within the token max) text_chunks = [] for n in range(0, len(nested_sentences)): tc = " ".join(map(str, nested_sentences[n])) text_chunks.append(tc) if gen_keywords == 'Yes': st.markdown("### Top Keywords") with st.spinner("Generating keywords from text..."): kw_df = pd.DataFrame() for text_chunk in text_chunks: keywords_list = md.keyword_gen(kw_model, text_chunk) kw_df = kw_df.append(pd.DataFrame(keywords_list)) kw_df.columns = ['keyword', 'score'] top_kw_df = kw_df.groupby('keyword')['score'].max().reset_index() top_kw_df = top_kw_df.sort_values('score', ascending = False).reset_index().drop(['index'], axis=1) st.dataframe(top_kw_df.head(10)) st.markdown("### Summary") with st.spinner(f'Generating summaries for {len(text_chunks)} text chunks (this may take a minute)...'): my_expander = st.expander(label=f'Expand to see intermediate summary generation details for {len(text_chunks)} text chunks') with my_expander: summary = [] st.markdown("_Once the original text is broken into smaller chunks (totaling no more than 1024 tokens, \ with complete setences), each block of text is then summarized separately using BART NLI \ and then combined at the very end to generate the final summary._") for num_chunk, text_chunk in enumerate(text_chunks): st.markdown(f"###### Original Text Chunk {num_chunk+1}/{len(text_chunks)}" ) st.markdown(text_chunk) chunk_summary = md.summarizer_gen(summarizer, sequence=text_chunk, maximum_tokens = 300, minimum_tokens = 20) summary.append(chunk_summary) st.markdown(f"###### Partial Summary {num_chunk+1}/{len(text_chunks)}") st.markdown(chunk_summary) # Combine all the summaries into a list and compress into one document, again final_summary = " \n\n".join(list(summary)) st.markdown(final_summary) if len(text_input) == 0 or len(labels) == 0: st.error('Enter some text and at least one possible topic to see label predictions.') else: st.markdown("### Top Label Predictions on Summary vs Full Text") with st.spinner('Matching labels...'): topics, scores = md.classifier_zero(classifier, sequence=final_summary, labels=labels, multi_class=True) # st.markdown("### Top Label Predictions: Combined Summary") # plot_result(topics[::-1][:], scores[::-1][:]) # st.markdown("### Download Data") data = pd.DataFrame({'label': topics, 'scores_from_summary': scores}) # st.dataframe(data) # coded_data = base64.b64encode(data.to_csv(index = False). encode ()).decode() # st.markdown( # f'Download Data', # unsafe_allow_html = True # ) topics_ex_text, scores_ex_text = md.classifier_zero(classifier, sequence=text_input, labels=labels, multi_class=True) plot_dual_bar_chart(topics, scores, topics_ex_text, scores_ex_text) data_ex_text = pd.DataFrame({'label': topics_ex_text, 'scores_from_full_text': scores_ex_text}) data2 = pd.merge(data, data_ex_text, on = ['label']) if len(glabels) > 0: gdata = pd.DataFrame({'label': glabels}) gdata['is_true_label'] = int(1) data2 = pd.merge(data2, gdata, how = 'left', on = ['label']) data2['is_true_label'].fillna(0, inplace = True) st.markdown("### Data Table") with st.spinner('Generating a table of results and a download link...'): st.dataframe(data2) @st.cache def convert_df(df): # IMPORTANT: Cache the conversion to prevent computation on every rerun return df.to_csv().encode('utf-8') csv = convert_df(data2) st.download_button( label="Download data as CSV", data=csv, file_name='text_labels.csv', mime='text/csv', ) # coded_data = base64.b64encode(data2.to_csv(index = False). encode ()).decode() # st.markdown( # f'Click here to download the data', # unsafe_allow_html = True # ) if len(glabels) > 0: st.markdown("### Evaluation Metrics") with st.spinner('Evaluating output against ground truth...'): section_header_description = ['Summary Label Performance', 'Original Full Text Label Performance'] data_headers = ['scores_from_summary', 'scores_from_full_text'] for i in range(0,2): st.markdown(f"###### {section_header_description[i]}") report = classification_report(y_true = data2[['is_true_label']], y_pred = (data2[[data_headers[i]]] >= threshold_value) * 1.0, output_dict=True) df_report = pd.DataFrame(report).transpose() st.markdown(f"Threshold set for: {threshold_value}") st.dataframe(df_report) st.success('All done!') st.balloons()