ML/LangChain: Fix standalone vector_search.py example program

Author: amotl

topic/machine-learning/llm-langchain/vector_search.py

@@ -24,9 +24,14 @@
 from langchain_text_splitters import CharacterTextSplitter
 from langchain_openai import OpenAIEmbeddings
 
+import nltk
+
 
 def main():
 
+    nltk.download("averaged_perceptron_tagger_eng")
+    nltk.download("punkt_tab")
+
     # Load the document, split it into chunks, embed each chunk,
     # and load it into the vector store.
     state_of_the_union_url = "https://github.com/langchain-ai/langchain/raw/v0.0.325/docs/docs/modules/state_of_the_union.txt"