Chain-of-Density Summarization

Compress text through iterative entity injection following the CoD paper methodology. Each pass identifies missing entities from the source and incorporates them while maintaining identical length.

The Method

Chain-of-Density works through multiple iterations:

1. Iteration 1: Create sparse, verbose base summary (4-5 sentences at target_words)
2. Subsequent iterations: Each iteration:
   • Identify 1-3 missing entities from SOURCE (not summary)
   • Rewrite summary to include them
   • Maintain IDENTICAL word count through compression

Key principle: Never drop entities - only add and compress.

Missing Entity Criteria

Each entity added must meet ALL 5 criteria: