From b37d1d0e74fbda6467602adbb470bd97fb519bc2 Mon Sep 17 00:00:00 2001
From: Dustin Ngo <dustin@arize.com>
Date: Tue, 3 Oct 2023 01:13:42 -0400
Subject: [PATCH] Add summary index builder script

---
 ...a_index_with_markdown_section_summaries.py | 127 ++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 scripts/data/build_llama_index_with_markdown_section_summaries.py

diff --git a/scripts/data/build_llama_index_with_markdown_section_summaries.py b/scripts/data/build_llama_index_with_markdown_section_summaries.py
new file mode 100644
index 0000000000..e469005231
--- /dev/null
+++ b/scripts/data/build_llama_index_with_markdown_section_summaries.py
@@ -0,0 +1,127 @@
+import argparse
+import glob
+import itertools
+import logging
+import os
+import pathlib
+import re
+import sys
+
+from llama_index import LLMPredictor, ServiceContext, VectorStoreIndex
+from llama_index.embeddings import OpenAIEmbedding
+from llama_index.llms import OpenAI
+from llama_index.node_parser import SimpleNodeParser
+from llama_index.node_parser.extractors import (MetadataExtractor,
+                                                QuestionsAnsweredExtractor,
+                                                SummaryExtractor)
+from llama_index.schema import Document
+from llama_index.text_splitter import SentenceSplitter
+
+
+def read_markdown_files(directory):
+    markdown_files = []
+    # Recursively traverse the directory
+    for root, _, _ in os.walk(directory):
+        # Match markdown files using glob pattern
+        markdown_files.extend(glob.glob(os.path.join(root, "*.md")))
+    markdown_content = dict()
+    for file_path in markdown_files:
+        with open(file_path, "r") as file:
+            content = file.read()
+            markdown_content[file_path] = content
+    return markdown_content
+
+
+def markdown_header_splitter(text):
+    splits = []
+    header_metadata = []
+    current_split = ""
+    current_headers = []
+    codeblock_delimiters = 0
+
+    def in_codeblock(delimiter_count):
+        return delimiter_count % 2 == 1
+
+    def header_level(header):
+        pattern = re.compile("(#*)(.*)")
+        return len(pattern.match(header).groups()[0])
+
+    lines = text.splitlines()
+    for line in lines:
+        if line.startswith("```"):
+            codeblock_delimiters += 1
+
+        if line.startswith("#") and not in_codeblock(codeblock_delimiters):
+            if current_split:
+                splits.append(current_split)
+                header_metadata.append(current_headers)
+            current_split = ""
+            current_header_level = header_level(line)
+            current_headers = list(
+                itertools.takewhile(
+                    lambda h: header_level(h) < current_header_level, current_headers
+                )
+            )
+            current_headers.append(line)
+        else:
+            current_split += f"{line}\n"
+
+    if current_split:
+        splits.append(current_split)
+        header_metadata.append(current_headers)
+
+    return splits, header_metadata
+
+
+if __name__ == "__main__":
+    logger = logging.getLogger(__name__)
+    logging.basicConfig(level=logging.INFO, stream=sys.stdout)
+
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "docs_dir",
+        type=str,
+        help="Path to Arize docs repo.",
+    )
+    parser.add_argument(
+        "persist_dir",
+        type=str,
+        help="Path to directory where index will be persisted.",
+    )
+    args = parser.parse_args()
+
+    # specify llm
+    llm_predictor_chatgpt = LLMPredictor(llm=OpenAI(temperature=0, model_name="gpt-4"))
+    service_context = ServiceContext.from_defaults(
+        llm_predictor=llm_predictor_chatgpt, chunk_size_limit=1024
+    )
+
+    # documents
+    logger.info(f"Reading documentation from {args.docs_dir}...")
+    docs = []
+    docpath = pathlib.Path(args.docs_dir).expanduser()
+    markdown_files = read_markdown_files(docpath)
+    for filepath, md in markdown_files.items():
+        splits, headers = markdown_header_splitter(md)
+        for text, header in zip(splits, headers):
+            docs.append(Document(text=text, metadata={"headers": header}))
+
+    # nodes
+    logger.info("Extracting metadata from each chunk...")
+    nodes = SimpleNodeParser.from_defaults(
+        chunk_size=1024,
+        text_splitter=SentenceSplitter(),
+        metadata_extractor=MetadataExtractor(extractors=[QuestionsAnsweredExtractor()]),
+    ).get_nodes_from_documents(docs, show_progress=True)
+    summarizer = SummaryExtractor(service_context=service_context)
+    summaries = summarizer.extract(nodes)
+
+    embed_model = OpenAIEmbedding()
+    logger.info("Constructing chunk embeddings from summaries...")
+    for node, summary in zip(nodes, summaries):
+        node.embedding = embed_model.get_text_embedding(summary["section_summary"])
+
+    # index
+    index = VectorStoreIndex(nodes=nodes)
+    index.storage_context.persist(persist_dir=args.persist_dir)
+    logger.info(f"Persisted index to '{args.persist_dir}'")