Update README.md

README.md

@@ -19,12 +19,26 @@ size_categories:
 
 a "stacked" version of `xsum` 
 
+1. Original Dataset: copy of the base dataset
+
+2. Stacked Rows: The original dataset is processed by stacking rows based on certain criteria:
+   - Maximum Input Length: The maximum length for input sequences is 1024 tokens in the longt5 model tokenizer.
+   - Maximum Output Length: The maximum length for output sequences is also 1024 tokens in the longt5 model tokenizer.
+
+3. Special Token: The dataset utilizes the `[NEXT_CONCEPT]` token to indicate a new topic **within** the same summary. It is recommended to explicitly add this special token to your model's tokenizer before training, ensuring that it is recognized and processed correctly during downstream usage.
+4. 
 ## updates 
 
 - dec 3: upload initial version
 - dec 4: upload v2 with basic data quality fixes (i.e. the `is_stacked` column)
 - dec 5 0500: upload v3 which has pre-randomised order and duplicate rows for document+summary dropped
 
+
+## stats
+
+
+![stats](https://i.imgur.com/TyyDthT.png)
+
 ## dataset details
 
 see the repo `.log` file for more details.