(2011) increases the F1 score slightly from 75.13 to 75.69 in C2F, but it does not help as much in cases that require bijective mapping: Daume, Union and Pretrain.
v k ∈ R d can be used to project the variables from the original d-and d -dimensional spaces to a k-dimensional space: The new k-dimensional representation of each variable now contains information about the other variable.