add fly data info to readme

README.md

@@ -17,7 +17,8 @@ GENA-LM (`gena-lm-bert-base-fly`) model is trained with a masked language model
 - 768 Hidden size
 - 32k Vocabulary size
 
-We pre-trained `gena-lm-bert-base-fly` using TODO(data). Pre-training was performed for 1,900,000 iterations with batch size 256 and sequence length was equal to 512 tokens. We modified Transformer to use [Pre-Layer normalization](https://arxiv.org/abs/2002.04745). We upload checkpoint with the best MLM accuracy on validation set.
+We pre-trained `gena-lm-bert-base-fly` on data obtained from Progressive Cactus alignment of 298 drosophilid species generated by [Kim et al.](https://www.biorxiv.org/content/10.1101/2023.10.02.560517v1), dataset source: [link](https://doi.org/10.5061/dryad.x0k6djhrd).
+Pre-training was performed for 1,925,000 iterations with batch size 256 and sequence length was equal to 512 tokens. We modified Transformer to use [Pre-Layer normalization](https://arxiv.org/abs/2002.04745). We upload the checkpoint with the best loss on validation set.
 
 Source code and data: https://github.com/AIRI-Institute/GENA_LM
 
@@ -84,4 +85,4 @@ For evaluation results, see our paper: https://www.biorxiv.org/content/10.1101/2
 	journal = {bioRxiv}
 }
 
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+```