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fix: Compute the proximity on the words with the min distance

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Clément Renault 2019-02-12 15:42:17 +01:00
parent 092d446a7e
commit 2e5a616d8e
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GPG Key ID: 0151CDAB43460DAE
1 changed files with 38 additions and 24 deletions
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54
src/rank/criterion/words_proximity.rs
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@ -27,6 +27,7 @@ fn attribute_proximity((lattr, lwi): (u16, u32), (rattr, rwi): (u16, u32)) -> u3
fn min_proximity((lattr, lwi): (&[u16], &[u32]), (rattr, rwi): (&[u16], &[u32])) -> u32 {
let mut min_prox = u32::max_value();
for a in lattr.iter().zip(lwi) {
for b in rattr.iter().zip(rwi) {
let a = clone_tuple(a);
@ -34,34 +35,43 @@ fn min_proximity((lattr, lwi): (&[u16], &[u32]), (rattr, rwi): (&[u16], &[u32]))
min_prox = cmp::min(min_prox, attribute_proximity(a, b));
}
}
min_prox
}
fn matches_proximity(query_index: &[u32], attribute: &[u16], word_index: &[u32]) -> u32 {
fn matches_proximity(
query_index: &[u32],
distance: &[u8],
attribute: &[u16],
word_index: &[u32],
) -> u32
{
let mut query_index_groups = query_index.linear_group();
let mut proximity = 0;
let mut index = 0;
let mut iter = query_index.linear_group_by(PartialEq::eq);
let mut last = iter.next().map(|group| {
let len = group.len();
let get_attr_wi = |index: usize, group_len: usize| {
// retrieve the first distance group (with the lowest values)
let len = distance[index..index + group_len].linear_group().next().unwrap().len();
let rattr = &attribute[index..index + len];
let rwi = &word_index[index..index + len];
index += len;
(rattr, rwi)
};
let mut last = query_index_groups.next().map(|group| {
let attr_wi = get_attr_wi(index, group.len());
index += group.len();
attr_wi
});
while let (Some(lhs), Some(rhs)) = (last, iter.next()) {
let len = rhs.len();
let rattr = &attribute[index..index + len];
let rwi = &word_index[index..index + len];
let rhs = (rattr, rwi);
proximity += min_proximity(lhs, rhs);
last = Some(rhs);
index += len;
// iter by windows of size 2
while let (Some(lhs), Some(rhs)) = (last, query_index_groups.next()) {
let attr_wi = get_attr_wi(index, rhs.len());
proximity += min_proximity(lhs, attr_wi);
last = Some(attr_wi);
index += rhs.len();
}
proximity
@ -74,16 +84,18 @@ impl Criterion for WordsProximity {
fn evaluate(&self, lhs: &RawDocument, rhs: &RawDocument) -> Ordering {
let lhs = {
let query_index = lhs.query_index();
let distance = lhs.distance();
let attribute = lhs.attribute();
let word_index = lhs.word_index();
matches_proximity(query_index, attribute, word_index)
matches_proximity(query_index, distance, attribute, word_index)
};
let rhs = {
let query_index = rhs.query_index();
let distance = rhs.distance();
let attribute = rhs.attribute();
let word_index = rhs.word_index();
matches_proximity(query_index, attribute, word_index)
matches_proximity(query_index, distance, attribute, word_index)
};
lhs.cmp(&rhs)
@ -106,13 +118,14 @@ mod tests {
// { id: 3, attr: 3, attr_index: 1 }
let query_index = &[0, 1, 2, 2, 3];
let distance = &[0, 0, 0, 0, 0];
let attribute = &[0, 1, 1, 2, 3];
let word_index = &[0, 0, 1, 0, 1];
// soup -> of = 8
// + of -> the = 1
// + the -> day = 8 (not 1)
assert_eq!(matches_proximity(query_index, attribute, word_index), 17);
assert_eq!(matches_proximity(query_index, distance, attribute, word_index), 17);
}
#[test]
@ -128,12 +141,13 @@ mod tests {
// { id: 3, attr: 1, attr_index: 3 }
let query_index = &[0, 0, 1, 2, 3, 3];
let distance = &[0, 0, 0, 0, 0, 0];
let attribute = &[0, 1, 1, 1, 0, 1];
let word_index = &[0, 0, 1, 2, 1, 3];
// soup -> of = 1
// + of -> the = 1
// + the -> day = 1
assert_eq!(matches_proximity(query_index, attribute, word_index), 3);
assert_eq!(matches_proximity(query_index, distance, attribute, word_index), 3);
}
}