# Large File Merge Instructions

## Overview

Some large files have been split into 1GB chunks for easier upload/download. The split files are stored in dedicated `*_files/` directories alongside the original file location.

## Files that need merging

- `kb_index.faiss` (25.3 GB) 
  - Split into ~26 parts in `2M_kb_eval/echosight_evqa_2M_kb/kb_index_files/`

## How to Merge

After downloading this dataset, navigate to the specific `*_files/` directory and run the merge script:

```bash
cd annotation/2M_kb_eval/echosight_evqa_2M_kb/kb_index_files/
python merge_chunks.py
```

This will automatically:
1. Detect all `.part*` files in current directory
2. Merge them back into the complete file (e.g., `kb_index.faiss`)
3. Place the merged file in the parent directory (`../`)
4. Optionally delete the `.part` files after successful merge

## Requirements

- Python 3.6+
- Sufficient disk space (at least 2x the size of the largest file during merge)

## Verification

After merging, verify the file exists in the parent directory:
```bash
ls -lh ../kb_index.faiss
```

Expected size: ~25.3 GB