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Create PDF to JSONL processor using PyPDF and LangChain

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Switch `pydantic' to >= 1.9.1 else `langchain.document_loaders' starts
throwing typing error for python 3.8, 3.9
This commit is contained in:
Debanjum Singh Solanky 2023-06-01 09:31:18 +05:30
parent 1b3effd8e6
commit 286b500f66
2 changed files with 16 additions and 28 deletions
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3
pyproject.toml
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@ -44,7 +44,7 @@ dependencies = [
"tiktoken >= 0.3.0",
"tenacity >= 8.2.2",
"pillow == 9.3.0",
"pydantic == 1.9.1",
"pydantic >= 1.9.1",
"pyqt6 == 6.3.1",
"pyyaml == 6.0",
"rich >= 13.3.1",
@ -54,6 +54,7 @@ dependencies = [
"uvicorn == 0.17.6",
"aiohttp == 3.8.4",
"langchain >= 0.0.187",
"pypdf >= 3.9.0",
]
dynamic = ["version"]

39
src/khoj/processor/pdf/pdf_to_jsonl.py
View file

@ -1,14 +1,15 @@
# Standard Packages
import glob
import logging
import re
from pathlib import Path
from typing import List
# External Packages
from langchain.document_loaders import PyPDFLoader
# Internal Packages
from khoj.processor.text_to_jsonl import TextToJsonl
from khoj.utils.helpers import get_absolute_path, is_none_or_empty, timer
from khoj.utils.constants import empty_escape_sequences
from khoj.utils.jsonl import dump_jsonl, compress_jsonl_data
from khoj.utils.rawconfig import Entry
@ -90,29 +91,17 @@ class PdfToJsonl(TextToJsonl):
@staticmethod
def extract_pdf_entries(pdf_files):
"""Extract entries by heading from specified PDF files"""
# Regex to extract PDF Entries by Heading
pdf_heading_regex = r"^#"
"""Extract entries by page from specified PDF files"""
entries = []
entry_to_file_map = []
entry_to_location_map = []
for pdf_file in pdf_files:
with open(pdf_file, "r", encoding="utf8") as f:
pdf_content = f.read()
pdf_entries_per_file = []
any_headings = re.search(pdf_heading_regex, pdf_content, flags=re.MULTILINE)
for entry in re.split(pdf_heading_regex, pdf_content, flags=re.MULTILINE):
# Add heading level as the regex split removed it from entries with headings
prefix = "#" if entry.startswith("#") else "# " if any_headings else ""
stripped_entry = entry.strip(empty_escape_sequences)
if stripped_entry != "":
pdf_entries_per_file.append(f"{prefix}{stripped_entry}")
entry_to_file_map += zip(pdf_entries_per_file, [pdf_file] * len(pdf_entries_per_file))
loader = PyPDFLoader(pdf_file)
pdf_entries_per_file = [page.page_content for page in loader.load()]
entry_to_location_map += zip(pdf_entries_per_file, [pdf_file] * len(pdf_entries_per_file))
entries.extend(pdf_entries_per_file)
return entries, dict(entry_to_file_map)
return entries, dict(entry_to_location_map)
@staticmethod
def convert_pdf_entries_to_maps(parsed_entries: List[str], entry_to_file_map) -> List[Entry]:
@ -120,21 +109,19 @@ class PdfToJsonl(TextToJsonl):
entries = []
for parsed_entry in parsed_entries:
entry_filename = Path(entry_to_file_map[parsed_entry])
heading = parsed_entry.splitlines()[0] if re.search("^#+\s", parsed_entry) else ""
# Append base filename to compiled entry for context to model
# Increment heading level for heading entries and make filename as its top level heading
prefix = f"# {entry_filename.stem}\n#" if heading else f"# {entry_filename.stem}\n"
compiled_entry = f"{prefix}{parsed_entry}"
heading = f"{entry_filename.stem}\n"
compiled_entry = f"{heading}{parsed_entry}"
entries.append(
Entry(
compiled=compiled_entry,
raw=parsed_entry,
heading=f"{prefix}{heading}",
heading=heading,
file=f"{entry_filename}",
)
)
logger.debug(f"Converted {len(parsed_entries)} pdf entries to dictionaries")
logger.debug(f"Converted {len(parsed_entries)} PDF entries to dictionaries")
return entries