update readme

README.md

@@ -39,4 +39,46 @@ configs:
     data_files:
       - split: validation
         path: "stage2/valid_stage2.parquet"
----
+---
+
+
+
+### Dataset organization
+
+The OpenGenome dataset is organized in 2 stages, where stage 1 has context length 8k and stage 2 has context length 131k.  Each stage has their own datasplits.
+
+```
+- stage1
+  - train
+  - validation
+  - test
+
+- stage2
+  - train
+  - validation
+  - test
+```
+
+### Instructions to download
+
+You can load a dataset using HF's API, with an example below.
+
+```
+from datasets import load_dataset
+
+stage1_data = load_dataset("LongSafari/open-genome", 'stage1')
+
+# access just the train data
+stage_1_train_data = stage1_data['train']
+
+```
+
+Note: stage 1 training dataset is sharded into separate files due to it's large size.
+
+We also provide a small dataset sample to test out the pipeline if you prefer.
+
+```
+sample_data = load_dataset("LongSafari/open-genome", 'sample')['validation']
+
+```
+