Hi,
I am studying the LR / SGD code and I was wondering why in the iris test
case the first element of each vector is set to 1 in the loop parsing the
CSV file via v.set(0,1)
for (String line : raw.subList(1, raw.size())) {
// order gets a list of indexes
order.add(order.size());
// parse the predictor variables
Vector v = new DenseVector(5);
v.set(0, 1);
int i = 1;
Iterable<String> values = onComma.split(line);
for (String value : Iterables.limit(values, 4)) {
v.set(i++, Double.parseDouble(value));
}
data.add(v);
// and the target
target.add(dict.intern(Iterables.get(values, 4)));
}
If I remove the line the accuracy drops to 92% but I don't know why this is
happening. Where is this first element used throughout the algorithm?
Cheers,
Frank
