Entity Relatedness Function

[petarR]

I think there might be a mistake how the relatedness is calculated. In entityRelatedness_model.py line 62 is calculating cosine or euclidian distance between the entities, whereas it needs to be calculating the probability of the related entity appearing after the main entity, which should be done with the softmax function.

The distance function could be replaced with:

def get_relatedness_for(sourceEntity, targetEntity, model, method="skip"):
    iprob=0
    if method=="skip":
        # skip gram
        iprob = 1.0 / (1.0 + np.exp(-np.dot(model.syn1neg[targetEntity.index].T, model.syn0[sourceEntity.index])))
    if method =="cbow":
        #cbow
        iprob = 1.0 / (1.0 + np.exp(-np.dot(model.syn0[targetEntity.index].T, model.syn1neg[sourceEntity.index])))
    return str(iprob)