... computed as the product of the weights of all the tokens in the sequence. The aimof this new weighting scheme, as detailed in the nextsection, is to eliminate the bias caused by the specialstructure ... the acquisition relationship coincide with the two arguments. They do not contribute anybias, since they are replaced with the generic tagse1 and e2 in all sentences from the bag. Thereare ... to update the recursive computation of the subsequence kernel so that it reflects the newweighting scheme.If all the word weights are set to 1, then the newkernel is equivalent to the old one....