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annotation/2M_kb_eval/echosight_evqa_2M_kb/kb_index_files/README.md

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+# kb_index.faiss - Split File Parts
+
+This directory contains the split parts of `kb_index.faiss` (25.28 GB), divided into 26 chunks of ~1GB each for easier upload/download.
+
+## Files
+
+- `kb_index.faiss.part000` to `kb_index.faiss.part025` (26 parts)
+- `merge_chunks.py` - Merge script
+- `README.md` - This file
+
+## How to Merge
+
+After downloading this dataset, run the merge script in this directory:
+
+```bash
+cd annotation/2M_kb_eval/echosight_evqa_2M_kb/kb_index_files/
+python merge_chunks.py
+```
+
+The script will:
+1. Automatically detect all `.part*` files in the current directory
+2. Merge them into `../kb_index.faiss` (parent directory)
+3. Verify the merged file size (~25.28 GB)
+4. Optionally delete the `.part` files after successful merge
+
+## Requirements
+
+- Python 3.6+
+- ~50 GB free disk space during merge (25 GB for parts + 25 GB for merged file)
+
+## Verification
+
+After merging, verify the file:
+```bash
+ls -lh ../kb_index.faiss
+# Expected: ~25.28 GB
+```