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README.md

@@ -32,6 +32,7 @@ Long-context tokenized corpus for benchmarking LLM prefill computation with Qwen
 | `data/documents.parquet` | English documents with token IDs and char offsets | ~100-500 |
 | `data/tasks.parquet` | QA, translation, and retrieval tasks | ~1K-5K |
 | `data/translations.parquet` | French translations of OPUS-Books English documents | ~100-500 |
+| `data/aligned_chunks.parquet` | EN/FR aligned chunk pairs packed to ~1k source tokens | ~1K-5K |
 
 ### `documents.parquet` Schema
 
@@ -67,6 +68,26 @@ Long-context tokenized corpus for benchmarking LLM prefill computation with Qwen
 | `target_token_ids` | list\<int32\> | Tokenized translation |
 | `target_char_offsets` | list\<int32\> | Char offsets for translation tokens |
 
+### `aligned_chunks.parquet` Schema
+
+| Column | Type | Description |
+|--------|------|-------------|
+| `chunk_id` | string | Unique chunk ID (`doc_id` + chunk index) |
+| `doc_id` | string | References OPUS English document |
+| `chunk_idx` | int32 | Chunk index within document |
+| `segment_start_idx` | int32 | Start aligned segment index (inclusive) |
+| `segment_end_idx` | int32 | End aligned segment index (exclusive) |
+| `src_lang` | string | Always `"en"` |
+| `tgt_lang` | string | Always `"fr"` |
+| `src_text` | large_string | English chunk text |
+| `tgt_text` | large_string | French chunk text |
+| `src_char_start` / `src_char_end` | int32 | Character span in source document |
+| `tgt_char_start` / `tgt_char_end` | int32 | Character span in translation document |
+| `src_tok_start` / `src_tok_end` | int32 | Token span in source token IDs |
+| `tgt_tok_start` / `tgt_tok_end` | int32 | Token span in target token IDs |
+| `src_token_count` | int32 | Source tokens in chunk (target ~1000) |
+| `tgt_token_count` | int32 | Target tokens in chunk |
+
 ## Sources
 
 | Source | Purpose | Target Tokens |