Add dataset card

README.md

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+---
+language:
+  - vi
+  - en
+license: mit
+task_categories:
+  - translation
+tags:
+  - vietnamese
+  - english
+  - parallel-corpus
+  - bidirectional
+size_categories:
+  - 1M<n<10M
+---
+
+# MTET Vietnamese–English Bidirectional Dataset (Cleaned)
+
+This is the cleaned, bidirectional version of the MTET (Machine Translation Evaluation for Translation) Vietnamese–English parallel corpus used to train the [vi-en-transformer-25m](https://huggingface.co/Cong123779/vi-en-transformer-25m) model.
+
+## Dataset Description
+- **Source:** MTET corpus (public Vietnamese–English parallel data)
+- **Processing:** Cleaned with heuristic filters, bidirectional pairs added (both VI→EN and EN→VI)
+- **Format:** CSV with columns `source` and `target`
+- **Size:** ~2 GB (cleaned)
+
+## Files
+| File | Description |
+|---|---|
+| `mtet_bidirectional_cleaned.csv` | Main training data (bidirectional, cleaned) |
+
+## Usage
+```python
+import pandas as pd
+df = pd.read_csv("mtet_bidirectional_cleaned.csv")
+print(df.head())
+# source                           target
+# xin chào                         hello
+# hello                             xin chào
+```
+
+## License
+The dataset follows the original MTET distribution license (MIT).