Prediction Scores in Negative

[sharadkhandelwal]

The predict method returns negative scores.
public List<Pair<Float, String>> predict(String[] lineTokens, int k)

Tested the same model with C++ library and scores are all positive.

[ivanhk]

if you add Math.exp(score), you will get the same score as c++.
see FastText.java:

public void predict(InputStream in, int k, boolean print_prob) throws IOException, Exception{
...
	if (print_prob) {
		System.out.printf(" %f", Math.exp(pair.getKey()));
  	}
...
}

[sharadkhandelwal]

Any reason for not doing this in the predict method itself ?

[ivanhk]

i think is about performance, exp() is a slow function.