Update README.md

README.md

@@ -98,10 +98,19 @@ The data is intended to be used for training and testing models for Norwegian do
 
 <!-- This section provides a description of the dataset fields, and additional information about the dataset structure such as criteria used to create the splits, relationships between data points, etc. -->
 
-[More Information Needed]
+Each instance in the data has the following three fields:
+- 'id': a uniqe document identifier
+- 'review': the actual review text 
+- 'sentiment': a numerical class label indicating polarity, which can have one of three values:
+    - 0 = negative
+    - 1 = positive
+    - 2 = fair (only available in the ternary version)
 
+In terms of the mapping from the six-point numerical ratings in the underlying [NoReC](https://huggingface.co/datasets/ltg/norec) dataset, 'negative' (0) here corresponds to ratings of 1–3, 'positive' (0) corresponds to ratings of 5–6, while 'fair' corresponds to ratings of 4. In the binary version of NoReC_document, reviews with a rating of 4 are excluded.
 
-### Source Data
+The data comes with pre-defined train/dev/test splits, inherited from NoReC.
+
+## Source Data
 
 <!-- This section describes the source data (e.g. news text and headlines, social media posts, translated sentences, ...). -->
 
@@ -117,7 +126,7 @@ The numerical ratings of the underlying NoReC dataset were provided by the origi
 The data does not contain information considered personal or sensitive.
 
 
-## Bias, Risks, and Limitations
+### Bias, Risks, and Limitations
 
 <!-- This section is meant to convey both technical and sociotechnical limitations. -->