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* Khoj
  /Natural language search engine for your personal notes, transactions and images/

** Features
  - Advanced Natural language understanding using Transformer based ML Models
  - Your personal data stays local. All search, indexing is done on your machine[[https://github.com/debanjum/khoj#miscellaneous][*]]
  - Index Org-mode and Markdown notes, Beancount transactions and Photos
  - Interact with Khoj using a [[./src/interface/web/index.html][Web Browser]], [[./src/interface/emacs/khoj.el][Emacs]] or the [[http://localhost:8000/docs][API]]. 

** Demo
   https://user-images.githubusercontent.com/6413477/168417719-8a8bc4e5-8404-42b2-89a7-4493e3d2582c.mp4

** Architecture
   [[https://github.com/debanjum/khoj/blob/master/docs/khoj_architecture.png]]

** Setup

*** 1. Clone
    #+begin_src shell
      git clone https://github.com/debanjum/khoj && cd khoj
    #+end_src

*** 2. Configure
    - *Required*: Update [[./docker-compose.yml][docker-compose.yml]] to mount your images, (org-mode or markdown) notes and beancount directories
    - *Optional*: Edit application configuration in [[./config/sample_config.yml][sample_config.yml]]

*** 3. Run
    #+begin_src shell
    docker-compose up -d
    #+end_src

    /Note: The first run will take time. Let it run, it's mostly not hung, just generating embeddings/

** Use

   - *Khoj via Web*
     - Go to [[http://localhost:8000/]] or open [[./src/interface/web/index.html][index.html]] in your browser

   - *Khoj via Emacs*
     - [[https://github.com/debanjum/khoj/tree/master/src/interface/emacs#installation][Install]] [[./src/interface/emacs/khoj.el][khoj.el]]
     - Run ~M-x khoj <user-query>~

   - *Khoj via API*
     - See [[http://localhost:8000/docs][Khoj FastAPI Docs]]
     - [[http://localhost:8000/search?q=%22what%20is%20the%20meaning%20of%20life%22][Query]]
     - [[http://localhost:8000/regenerate?t=ledger][Regenerate Embeddings]]
     - [[https://localhost:8000/ui][Configure Application]]

** Upgrade
   #+begin_src shell
     docker-compose build --pull
   #+end_src

** Troubleshooting
   - Symptom: Errors out with "Killed" in error message
     - Fix: Increase RAM available to Docker Containers in Docker Settings
     - Refer: [[https://stackoverflow.com/a/50770267][StackOverflow Solution]], [[https://docs.docker.com/desktop/mac/#resources][Configure Resources on Docker for Mac]]
   - Symptom: Errors out complaining about Tensors mismatch, null etc
     - Mitigation: Delete content-type > image section from docker_sample_config.yml

** Miscellaneous
   - The experimental [[localhost:8000/chat][chat]] API endpoint uses the [[https://openai.com/api/][OpenAI API]]
     - It is disabled by default
     - To use it add your ~openai-api-key~ to config.yml

** Development Setup
*** Setup on Local Machine

**** 1. Install Dependencies
     1. Install Python3 [Required]
     2. [[https://docs.conda.io/projects/conda/en/latest/user-guide/install/index.html][Install Conda]] [Required]
     3. Install Exiftool [Optional]
        #+begin_src shell
        sudo apt-get -y install libimage-exiftool-perl
        #+end_src

**** 2. Install Khoj
       #+begin_src shell
       git clone https://github.com/debanjum/khoj && cd khoj
       conda env create -f config/environment.yml
       conda activate khoj
       #+end_src

**** 3. Configure
     - Configure files/directories to search in ~content-type~ section of ~sample_config.yml~
     - To run application on test data, update file paths containing ~/data/~ to ~tests/data/~ in  ~sample_config.yml~
       - Example replace ~/data/notes/*.org~ with ~tests/data/notes/*.org~

**** 4. Run
     Load ML model, generate embeddings and expose API to query notes, images, transactions etc specified in config YAML

     #+begin_src shell
     python3 -m src.main -c=config/sample_config.yml -vv
     #+end_src

*** Upgrade On Local Machine
    #+begin_src shell
      cd khoj
      git pull origin master
      conda deactivate khoj
      conda env update -f config/environment.yml
      conda activate khoj
    #+end_src

*** Run Unit tests
    #+begin_src shell
    pytest
    #+end_src

** Acknowledgments
   - [[https://huggingface.co/sentence-transformers/multi-qa-MiniLM-L6-cos-v1][Multi-QA MiniLM Model]] for Asymmetric Text Search. See [[https://www.sbert.net/examples/applications/retrieve_rerank/README.html][SBert Documentation]]
   - [[https://huggingface.co/sentence-transformers/all-MiniLM-L6-v2][All MiniLM Model]] for Symmetric Text Search
   - [[https://github.com/openai/CLIP][OpenAI CLIP Model]] for Image Search. See [[https://www.sbert.net/examples/applications/image-search/README.html][SBert Documentation]]
   - Charles Cave for [[http://members.optusnet.com.au/~charles57/GTD/orgnode.html][OrgNode Parser]]
   - Sven Marnach for [[https://github.com/smarnach/pyexiftool/blob/master/exiftool.py][PyExifTool]]
