Building Indexes on top of other Indexes with ComposableGraph

The ComposableGraph in LlamaIndex represents a sophisticated way to structure information by stacking Indexes on top of each other.

Figure 5.12 provides an overview of a ComposableGraph:

Figure 5.12 – The structure of a ComposableGraph

This approach allows for the construction of Indexes within individual documents – lower-level Indexes – and the aggregation of these Indexes into higher-order ones over a collection of documents. For example, you can build a TreeIndex for the text within each document and a SummaryIndex that encompasses each TreeIndex in a collection.

How to use the ComposableGraph

Here’s a simple code example demonstrating the usage of ComposableGraph:

from llama_index.core import (
    ComposableGraph, SimpleDirectoryReader, 
    TreeIndex, SummaryIndex)
documents = SimpleDirectoryReader("files...