Knowledge Graph Generation Module

The knowledge graph generation module queries a LLM to build a graph in Turtle format based on a specific provided Ontology. The prompt must be written beforehand accordingly with the ontology domain.

Main Components

• generate_ttl.py : Main script to generate one or more Turtle files using a large language (LLM) and a given ontology. Run this script from the generate_ttl_files directory.

• utils_gen/utils.py : Supporting utilities for model configuration, prompt management, querying the LLM, storing results, graph validation and managing files/folders.

  • List of functions :

    • query_llm(ontology_file,prompt_file,model,prompt_type):
    • storing_results(response,temp_file,file_result,logger,model):
    • model_to_choose(model_nbr):
    • build_folder_paths_and_files(model):
    • remove_file_in_folder(folder_path):
    • check_graph_format(folder_path, notformated_path, logger):
    • check_graph_reasoner(folder_path, invalid_reasoner_path, ontology, reasoner, logger):

Features

• Automated Generation: Automated generation of Turtle files using LLM, prompt and ontology.
• Configurable Output: Configurable number of graphs to generate via the --nbrttl command-line argument.
• Ontology Reasoner Selection: The --reasoner argument specifies which ontology reasoner to use for ontological compliancy checking of the generated Turtle files. Valid values are Pellet or HermiT (case-sensitive). The reasoner will be used to check for logical inconsistencies in the generated graphs. If not set correctly, the script will raise an error.
• Logging: Logging of generation process and LLM usage statistics.
• Folder & File Management: Automatic folder and file creation for results, logs, and temporary files.
• Validation Tools: Each TTL file generated is automatically checked by the following tools:
  • Ontology engineering tool for Turtle format rearrangement
  • Turtle Validator for syntax validation
  • Owlready2 for reasoning consistency checking
• Validated Output: Validated files are stored in the results/synthetic_graphs/<date>/<model> folder
• Cleanup Support: Support for removing old files before new generation.

Knowledge graph generation module Schema

graph TD
    AA[Graph Generation script]:::highlight
    AA --> D

    B[pre-defined Ontology, Prompt, Model Choosen] --> D[Query LLM]:::highlight
    CC[number of graphs to generate] --> AA
    AAA[Reasoner] --> AA

    D -->|Turtle graph produced| DD[ Store results in folder ]:::highlight

    DD --> E{Check Graph 
    Format with owl-cli}:::highlight

    E --> F{Check Graph 
    Syntax with Turtle validator}:::highlight
    E --> |Bad file format|G[Move bad file in Not formatted_Turtle file folder]

    F --> H{Check Graph consistency reasoning}:::highlight
    F --> |Bad syntax|I[Move bad file in invalid syntax folder]

    H --> |Good reasoning|K[Valid Graphs]
    H --> |Wrong reasoning|J[Move Bad file in invalid reasoning folder]

    classDef smallNode font-size:15px,padding:1px;
    class E smallNode;
    classDef highlight fill:#f9d423,stroke:#333,stroke-width:4px;