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## Description
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Please provide a clear, human-generated description of the changes in
this PR.
DO NOT use AI-generated descriptions. We want to understand your thought
process and reasoning.
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I Implemented Lexical Chunk Retriever In the LexicalRetriever class is
Inherite the BaseRetriever and The DocumentChunk are lazy loaded when
first time query is made because it save time during object
initialization
and the function get_context and the get_completion are Implemented same
as the ChunksRetriever the only diffrence is that the DocumentChunk are
converted to match the output type of the ChunksRetriever using function
get_own_properties in the utils.
## Type of Change
<!-- Please check the relevant option -->
- [-] Bug fix (non-breaking change that fixes an issue)
- [-] New feature (non-breaking change that adds functionality)
- [-] Breaking change (fix or feature that would cause existing
functionality to change)
- [-] Documentation update
- [-] Code refactoring
- [-] Performance improvement
- [-] Other (please specify):
## Changes Made
<!-- List the specific changes made in this PR -->
- Added LexicalRetriever base class with customizable tokenizer & scorer
- Implemented caching of DocumentChunk tokens and payloads
- Added robust initialization with error handling and logging -
Implemented get_context with top_k ranking and optional scores
- Implemented get_completion consistent with BaseRetriever interface
- Added JaccardChunksRetriever demo using set/multiset Jaccard
similarity
- Support for stopwords and multiset frequency-aware similarity -
Integrated logging for initialization, scoring, and retrieval
## Testing
- Manual tests: initialized retriever, retrieved chunks with toy corpus
- Edge cases: empty corpus, empty query, scorer/tokenizer errors
- Verified Jaccard similarity results for single/multiset cases
- Code formatted and linted
## Screenshots/Videos (if applicable)
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## Pre-submission Checklist
<!-- Please check all boxes that apply before submitting your PR -->
- [-] **I have tested my changes thoroughly before submitting this PR**
- [-] **This PR contains minimal changes necessary to address the
issue/feature**
- [-] My code follows the project's coding standards and style
guidelines
- [-] I have added tests that prove my fix is effective or that my
feature works
- [-] I have added necessary documentation (if applicable)
- [-] All new and existing tests pass
- [-] I have searched existing PRs to ensure this change hasn't been
submitted already
- [-] I have linked any relevant issues in the description
- [-] My commits have clear and descriptive messages
## Related Issues
<!-- Link any related issues using "Fixes #issue_number" or "Relates to
#issue_number" -->
Relates to #1392
## Additional Notes
<!-- Add any additional notes, concerns, or context for reviewers -->
Int the cognee/modules/chunking/models/DocumentChunk.py
don't remove the optional from is_part_of attributes.
## DCO Affirmation
I affirm that all code in every commit of this pull request conforms to
the terms of the Topoteretes Developer Certificate of Origin.
---------
Co-authored-by: Andrej Milicevic <milicevicandrej@yahoo.com>
Co-authored-by: Igor Ilic <30923996+dexters1@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>
Co-authored-by: Igor Ilic <igorilic03@gmail.com>
Co-authored-by: Vasilije <8619304+Vasilije1990@users.noreply.github.com>
Co-authored-by: Boris <boris@topoteretes.com>
Co-authored-by: lxobr <122801072+lxobr@users.noreply.github.com>
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