update model card meta information

README.md

@@ -1,6 +1,11 @@
----
-license: apache-2.0
----
+---
+license: apache-2.0
+language:
+- en
+- ja
+base_model:
+- mistralai/Mistral-7B-v0.1
+---
 # RakutenAI-7B
 ## Model Description
 RakutenAI-7B is a systematic initiative that brings the latest technologies to the world of Japanese LLMs. RakutenAI-7B achieves the best scores on the Japanese language understanding benchmarks while maintaining a competitive performance on the English test sets among similar models such as OpenCalm, Elyza, Youri, Nekomata and Swallow. RakutenAI-7B leverages the Mistral model architecture and is based on [Mistral-7B-v0.1](https://huggingface.co/mistralai/Mistral-7B-v0.1) pre-trained checkpoint, exemplifying a successful retrofitting of the pre-trained model weights. Moreover, we extend Mistral's vocabulary from 32k to 48k to offer a better character-per-token rate for Japanese.
@@ -100,4 +105,4 @@ For citing our work on the suite of RakutenAI-7B models, please use:
       archivePrefix={arXiv},
       primaryClass={cs.CL}
 }
-```
+```