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feat: add langchain markdown document splitter

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This commit is contained in:
Diwakar Singh Maurya 2025-05-24 00:19:44 +00:00
parent 30d15c1b4b
commit ac26da74f9
2 changed files with 34 additions and 2 deletions
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35
backend/open_webui/routers/retrieval.py
View File

@ -29,6 +29,7 @@ import tiktoken
from langchain.text_splitter import RecursiveCharacterTextSplitter, TokenTextSplitter from langchain.text_splitter import RecursiveCharacterTextSplitter, TokenTextSplitter
from langchain_text_splitters import MarkdownHeaderTextSplitter
from langchain_core.documents import Document from langchain_core.documents import Document
from open_webui.models.files import FileModel, Files from open_webui.models.files import FileModel, Files
@ -982,6 +983,7 @@ def save_docs_to_vector_db(
chunk_overlap=request.app.state.config.CHUNK_OVERLAP, chunk_overlap=request.app.state.config.CHUNK_OVERLAP,
add_start_index=True, add_start_index=True,
) )
docs = text_splitter.split_documents(docs)
elif request.app.state.config.TEXT_SPLITTER == "token": elif request.app.state.config.TEXT_SPLITTER == "token":
log.info( log.info(
f"Using token text splitter: {request.app.state.config.TIKTOKEN_ENCODING_NAME}" f"Using token text splitter: {request.app.state.config.TIKTOKEN_ENCODING_NAME}"
@ -994,11 +996,40 @@ def save_docs_to_vector_db(
chunk_overlap=request.app.state.config.CHUNK_OVERLAP, chunk_overlap=request.app.state.config.CHUNK_OVERLAP,
add_start_index=True, add_start_index=True,
) )
docs = text_splitter.split_documents(docs)
elif request.app.state.config.TEXT_SPLITTER == "markdown_header":
log.info("Using markdown header text splitter")
# Define headers to split on - covering most common markdown header levels
headers_to_split_on = [
("#", "Header 1"),
("##", "Header 2"),
("###", "Header 3"),
("####", "Header 4"),
("#####", "Header 5"),
("######", "Header 6"),
]
markdown_splitter = MarkdownHeaderTextSplitter(
headers_to_split_on=headers_to_split_on,
strip_headers=False, # Keep headers in content for context
)
md_split_docs = []
for doc in docs:
md_header_splits = markdown_splitter.split_text(doc.page_content)
# Convert back to Document objects, preserving original metadata
for split in md_header_splits:
md_split_docs.append(Document(
page_content=split.page_content,
metadata={**doc.metadata, **split.metadata}
))
docs = md_split_docs
else: else:
raise ValueError(ERROR_MESSAGES.DEFAULT("Invalid text splitter")) raise ValueError(ERROR_MESSAGES.DEFAULT("Invalid text splitter"))
docs = text_splitter.split_documents(docs)
if len(docs) == 0: if len(docs) == 0:
raise ValueError(ERROR_MESSAGES.EMPTY_CONTENT) raise ValueError(ERROR_MESSAGES.EMPTY_CONTENT)

1
src/lib/components/admin/Settings/Documents.svelte
View File

@ -398,6 +398,7 @@
> >
<option value="">{$i18n.t('Default')} ({$i18n.t('Character')})</option> <option value="">{$i18n.t('Default')} ({$i18n.t('Character')})</option>
<option value="token">{$i18n.t('Token')} ({$i18n.t('Tiktoken')})</option> <option value="token">{$i18n.t('Token')} ({$i18n.t('Tiktoken')})</option>
<option value="markdown_header">{$i18n.t('Markdown (Header)')}</option>
</select> </select>
</div> </div>
</div> </div>