Create app.py

app.py

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+import nltk
+import validators
+import streamlit as st
+from transformers import AutoTokenizer, pipeline
+
+# local modules
+from summarizer import Summarizer
+from utils import (
+    clean_text,
+    fetch_article_text,
+    preprocess_text_for_abstractive_summarization,
+    read_text_from_file,
+)
+
+if __name__ == "__main__":
+    # ---------------------------------
+    # Main Application
+    # ---------------------------------
+    st.title("Text-Summarization-Tool 📝")
+
+    st.markdown("---")
+    summarize_type = st.sidebar.selectbox(
+        "Summarization type", options=["Extractive", "Abstractive"]
+    )
+    st.markdown(
+        """This app supports two type of summarization:
+
+1. **Extractive Summarization**: The extractive approach involves picking up the most important phrases and lines from the documents. It then combines all the important lines to create the summary. So, in this case, every line and word of the summary actually belongs to the original document which is summarized.
+2. **Abstractive Summarization**: The abstractive approach involves rephrasing the complete document while capturing the complete meaning of the document. This type of summarization provides more human-like summary"""
+    )
+    # ---------------------------
+    # SETUP & Constants
+    nltk.download("punkt")
+    abs_tokenizer_name = "facebook/bart-large-cnn"
+    abs_model_name = "facebook/bart-large-cnn"
+    abs_tokenizer = AutoTokenizer.from_pretrained(abs_tokenizer_name)
+    abs_max_length = 130
+    abs_min_length = 30
+    # ---------------------------
+
+    inp_text = st.text_input("Enter Text or a URL here")
+    st.markdown(
+        "<h3 style='text-align: center;'>OR</h3>",
+        unsafe_allow_html=True,
+    )
+    uploaded_file = st.file_uploader(
+        "Upload a .txt, .pdf, .docx file for summarization"
+    )
+
+    is_url = validators.url(inp_text)
+    if is_url:
+        # complete text, chunks to summarize (list of sentences for long docs)
+        text, clean_txt = fetch_article_text(url=inp_text)
+    elif uploaded_file:
+        clean_txt = read_text_from_file(uploaded_file)
+        clean_txt = clean_text(clean_txt)
+    else:
+        clean_txt = clean_text(inp_text)
+
+    # view summarized text (expander)
+    with st.expander("View input text"):
+        if is_url:
+            st.write(clean_txt[0])
+        else:
+            st.write(clean_txt)
+    summarize = st.button("Summarize")
+
+    # called on toggle button [summarize]
+    if summarize:
+        if summarize_type == "Extractive":
+            if is_url:
+                text_to_summarize = " ".join([txt for txt in clean_txt])
+            else:
+                text_to_summarize = clean_txt
+            # extractive summarizer
+
+            with st.spinner(
+                text="Creating extractive summary. This might take a few seconds ..."
+            ):
+                ext_model = Summarizer()
+                summarized_text = ext_model(text_to_summarize, ratio=ext_sum_ratio)
+
+        elif summarize_type == "Abstractive":
+            with st.spinner(
+                text="Creating abstractive summary. This might take a few seconds ..."
+            ):
+                text_to_summarize = clean_txt
+                abs_summarizer = pipeline(
+                    "summarization", model=abs_model_name, tokenizer=abs_tokenizer_name
+                )
+
+                if is_url is False:
+                    # list of chunks
+                    text_to_summarize = preprocess_text_for_abstractive_summarization(
+                        tokenizer=abs_tokenizer, text=clean_txt
+                    )
+                tmp_sum = abs_summarizer(
+                    text_to_summarize,
+                    max_length=abs_max_length,
+                    min_length=abs_min_length,
+                    do_sample=False,
+                )
+
+                summarized_text = " ".join([summ["summary_text"] for summ in tmp_sum])
+
+        # final summarized output
+        st.subheader("Summarized text")
+        st.info(summarized_text)