fix download `en_core_web_sm`

app.py

@@ -1,5 +1,6 @@
 import gradio as gr
 
+import os
 import pandas as pd
 import matplotlib.pyplot as plt
 import numpy as np
@@ -115,6 +116,7 @@ def main(choose_context):
     df_topic_keywords
 
     # Define function to predict topic for a given text document.
+    os.system("python -m spacy download en_core_web_sm")
     nlp = spacy.load('en_core_web_sm', disable=['parser', 'ner'])
     def predict_topic(text, nlp=nlp):
         global sent_to_words