Crash using cosine similarity when calling search #40
Description
When indexing a small number of vectors I am getting this error when specifying cosine_similarity (euclidean works fine for instance):
thread 'hora_test' panicked at 'called `Option::unwrap()` on a `None` value', /Users/sam/.cargo/registry/src/github.com-1ecc6299db9ec823/hora-0.1.1/src/core/neighbor.rs:32:54
stack backtrace:
0: rust_begin_unwind
at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/std/src/panicking.rs:584:5
1: core::panicking::panic_fmt
at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/panicking.rs:143:14
2: core::panicking::panic
at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/panicking.rs:48:5
3: core::option::Option<T>::unwrap
at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/option.rs:752:21
4: <hora::core::neighbor::Neighbor<E,T> as core::cmp::Ord>::cmp
at /Users/sam/.cargo/registry/src/github.com-1ecc6299db9ec823/hora-0.1.1/src/core/neighbor.rs:32:9
5: <hora::core::neighbor::Neighbor<E,T> as core::cmp::PartialOrd>::partial_cmp
at /Users/sam/.cargo/registry/src/github.com-1ecc6299db9ec823/hora-0.1.1/src/core/neighbor.rs:38:14
6: core::cmp::PartialOrd::le
at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/cmp.rs:1129:19
7: core::cmp::impls::<impl core::cmp::PartialOrd<&B> for &A>::le
at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/cmp.rs:1505:13
8: alloc::collections::binary_heap::BinaryHeap<T>::sift_up
at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/alloc/src/collections/binary_heap.rs:562:16
9: alloc::collections::binary_heap::BinaryHeap<T>::push
at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/alloc/src/collections/binary_heap.rs:496:18
10: hora::index::hnsw_idx::HNSWIndex<E,T>::search_layer::{{closure}}
at /Users/sam/.cargo/registry/src/github.com-1ecc6299db9ec823/hora-0.1.1/src/index/hnsw_idx.rs:363:25
11: <core::slice::iter::Iter<T> as core::iter::traits::iterator::Iterator>::for_each
at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/slice/iter/macros.rs:211:21
12: hora::index::hnsw_idx::HNSWIndex<E,T>::search_layer
at /Users/sam/.cargo/registry/src/github.com-1ecc6299db9ec823/hora-0.1.1/src/index/hnsw_idx.rs:353:13
13: hora::index::hnsw_idx::HNSWIndex<E,T>::search_knn
at /Users/sam/.cargo/registry/src/github.com-1ecc6299db9ec823/hora-0.1.1/src/index/hnsw_idx.rs:433:25
14: <hora::index::hnsw_idx::HNSWIndex<E,T> as hora::core::ann_index::ANNIndex<E,T>>::node_search_k
at /Users/sam/.cargo/registry/src/github.com-1ecc6299db9ec823/hora-0.1.1/src/index/hnsw_idx.rs:615:55
15: hora::core::ann_index::ANNIndex::search
at /Users/sam/.cargo/registry/src/github.com-1ecc6299db9ec823/hora-0.1.1/src/core/ann_index.rs:93:9
16: hora_c::hora_test
at ./src/lib.rs:192:13
17: hora_c::hora_test::{{closure}}
at ./src/lib.rs:168:1
18: core::ops::function::FnOnce::call_once
at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/ops/function.rs:227:5
19: core::ops::function::FnOnce::call_once
at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/ops/function.rs:227:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
failures:
hora_test