Update README.md

README.md

@@ -88,12 +88,22 @@ An example:
 ```
 
 ### Data Fields
-- id: 
-- question: 
+- id: unique id of the instances, an integer between 1 and 1000;
+- question: "cause" or "effect". It suggests what kind of causal relation are we looking for: in the case of "cause" we search for the more plausible alternative that may be a cause of the premise. In the case of "effect" we are looking for a plausible result of the premise;
+- premise: the premise, a sentence;
+- choice1: the first alternative, a sentence;
+- choice2: the second alternative, a sentence;
+- label: the number of the more plausible alternative (1 or 2).
 
 ### Data Splits
 
-[More Information Needed]
+HuCoPA has 3 splits: *train*, *validation* and *test*. 
+
+| Dataset split | Number of instances in the split |
+|---------------|----------------------------------|
+| train         | 400                              |
+| validation    | 100                              |
+| test          | 500                              |
 
 ## Dataset Creation