Create README.md (#1)

- Create README.md (d5b061e5e971e5b344bf310cd298420ab00512a6)


Co-authored-by: Jurik Juraska <jjuraska@users.noreply.huggingface.co>

README.md

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+---
+license: apache-2.0
+---
+# MetricX-24 (XXL, bfloat16)
+
+*This is not an officially supported Google product.*
+
+> ℹ️ For the full-precision (float32) variant of this model, see [MetricX-24 (XXL)](https://huggingface.co/google/metricx-24-hybrid-xxl-v2p6).
+
+**GitHub repository**: https://github.com/google-research/metricx
+
+The repository contains the code for running inference on MetricX-24 models,
+a family of models for automatic evaluation of translations that were proposed
+in the WMT'24 Metrics Shared Task submission
+[MetricX-24: The Google Submission to the WMT 2024 Metrics Shared Task](https://aclanthology.org/2024.wmt-1.35/).
+The models were trained in [T5X](https://github.com/google-research/t5x) and
+then converted for use in PyTorch.
+
+
+## Available Models
+
+There are 3 MetricX-24 models available on Hugging Face that vary in the number
+of parameters. Unlike the MetricX-23 models, the MetricX-24 models are all
+hybrid models that can do both reference-based and reference-free (also known as
+quality estimation, or QE) inference:
+
+* [MetricX-24-Hybrid-XXL](https://huggingface.co/google/metricx-24-hybrid-xxl-v2p6)
+* [MetricX-24-Hybrid-XL](https://huggingface.co/google/metricx-24-hybrid-xl-v2p6)
+* [MetricX-24-Hybrid-Large](https://huggingface.co/google/metricx-24-hybrid-large-v2p6)
+
+We recommend using the XXL model versions for the best agreement with human
+judgments of translation quality, the Large versions for best speed, and the
+XL for an intermediate use case.
+
+
+## Changes to the WMT'24 Submission
+
+The MetricX-24 models available here are most similar to the primary submission
+to the WMT'24 Metrics Shared Task. They are initialized with
+[mT5](https://aclanthology.org/2021.naacl-main.41/),
+then fine-tuned on a combination of direct assessment and MQM data from
+WMT'15-'22. However, we made a couple of small changes that make these models
+different from the WMT'24 submissions.
+
+First, the metric scores get automatically clipped at 0 and 25, to ensure they
+are strictly in the [0, 25] range, as due to the nature of regression models,
+the scores could otherwise sometimes fall outside the range.
+
+Second, we included one additional type of synthetic training examples that
+weren't ready in time for the official submission. These are examples of perfect
+translations of multi-sentence segments, generated from the MQM data from
+WMT'20-'22. The purpose of this category of synthetic data is to reduce the
+model's bias against longer translations when the source segment and/or
+reference are also long.
+
+
+## Model Performance
+
+For comparison with the submissions to
+[WMT'24 Metrics Shared Task](https://www2.statmt.org/wmt24/pdf/2024.wmt-1.2.pdf),
+we provide an overview of the system- and segment-level correlation scores
+between the MetricX-24 scores and MQM ratings of translation quality, as
+calculated on the shared task's test sets:
+
+| Model | Sys-Level SPA (en-de) | Seg-Level Acc (en-de) | Sys-Level SPA (en-es) | Seg-Level Acc (en-es) | Sys-Level SPA (ja-zh) | Seg-Level Acc (ja-zh) |
+| -------------------------- | ----- | ----- | ----- | ----- | ----- | ----- |
+| MetricX-24-Hybrid-XXL      | 0.865 | 0.543 | 0.785 | 0.685 | 0.878 | 0.541 |
+| MetricX-24-Hybrid-XL       | 0.884 | 0.522 | 0.806 | 0.683 | 0.859 | 0.528 |
+| MetricX-24-Hybrid-Large    | 0.879 | 0.511 | 0.795 | 0.686 | 0.845 | 0.514 |
+| MetricX-24-Hybrid-QE-XXL   | 0.884 | 0.525 | 0.789 | 0.685 | 0.863 | 0.527 |
+| MetricX-24-Hybrid-QE-XL    | 0.879 | 0.502 | 0.774 | 0.683 | 0.849 | 0.509 |
+| MetricX-24-Hybrid-QE-Large | 0.809 | 0.490 | 0.762 | 0.684 | 0.847 | 0.508 |
+
+Below are the above correlation scores averaged, as used in the shared task to
+determine the final ranking of the submissions:
+
+| Model | Average Correlation |
+| -------------------------- | ----- |
+| MetricX-24-Hybrid-XXL      | 0.716 |
+| MetricX-24-Hybrid-XL       | 0.714 |
+| MetricX-24-Hybrid-Large    | 0.705 |
+| MetricX-24-Hybrid-QE-XXL   | 0.712 |
+| MetricX-24-Hybrid-QE-XL    | 0.699 |
+| MetricX-24-Hybrid-QE-Large | 0.683 |
+
+NOTE: Since MetricX-24 models are hybrid models, MetricX-24-\<size\> and
+MetricX-24-QE-\<size\> correspond to the same model, evaluated *with* and
+*without* the references, respectively.
+
+
+## Citation
+
+If you use MetricX-24 in your research, please cite the following publication:
+
+```bibtex
+@inproceedings{juraska-etal-2024-metricx,
+    title = "{M}etric{X}-24: The {G}oogle Submission to the {WMT} 2024 Metrics Shared Task",
+    author = "Juraska, Juraj  and
+      Deutsch, Daniel  and
+      Finkelstein, Mara  and
+      Freitag, Markus",
+    editor = "Haddow, Barry  and
+      Kocmi, Tom  and
+      Koehn, Philipp  and
+      Monz, Christof",
+    booktitle = "Proceedings of the Ninth Conference on Machine Translation",
+    month = nov,
+    year = "2024",
+    address = "Miami, Florida, USA",
+    publisher = "Association for Computational Linguistics",
+    url = "https://aclanthology.org/2024.wmt-1.35",
+    pages = "492--504",
+}
+```