Update new data with more challenging negative examples.

README.md

@@ -79,9 +79,9 @@ English.
 ### Data Instances
 
 **PS**
-* Size of downloaded dataset files: 25.03 MB
-* Size of the generated dataset: 16.22 MB
-* Total amount of disk used: 41.25 MB
+* Size of downloaded dataset files: 24.63 MB
+* Size of the generated dataset: 15.94 MB
+* Total amount of disk used: 40.58 MB
 
 ```
 {
@@ -109,7 +109,7 @@ The data fields are the same among all splits.
 
 |        name        |train |validation|test |
 |--------------------|----:|--------:|----:|
-|PS                  |39436|     5634|11266|
+|PS                  |7362|     1052|2102|
 
 ## Dataset Creation