src/obicompactvec/src/bitmatrix/persistent.rs

@@ -11,17 +11,20 @@ use crate::views::BitSliceView;
 
 use super::columnar::ColumnarBitMatrix;
 use super::packed::PackedBitMatrix;
+use super::sparse::PersistentSparseBitMatrix;
 
 // ── PersistentBitMatrix — public enum ────────────────────────────────────────
 
-/// Bit matrix that transparently handles columnar, packed, and implicit formats.
+/// Bit matrix that transparently handles columnar, packed, sparse, and implicit formats.
 ///
 /// - `Columnar`: per-column `.pbiv` files (original format, used during build)
 /// - `Packed`:   single `matrix.pbmx` file (optimised for query — one `mmap`)
+/// - `Sparse`:   sparse row-major format (`sparse_meta.json` + PFIV/EF files)
 /// - `Implicit`: no file — all values are 1 (mono-genome presence/absence)
 pub enum PersistentBitMatrix {
     Columnar(ColumnarBitMatrix),
     Packed(PackedBitMatrix),
+    Sparse(PersistentSparseBitMatrix),
     Implicit { n_rows: usize, n_cols: usize },
 }
 
@@ -31,17 +34,28 @@ impl PersistentBitMatrix {
     /// Checks (in order):
     /// 1. `layer_dir/presence/matrix.pbmx`      → Packed
     /// 2. `layer_dir/presence/meta.json`        → Columnar
-    /// 3. `layer_dir/layer_meta.json`        → Implicit (new index)
+    /// 3. `layer_dir/presence/sparse_meta.json` → Sparse
-    /// 4. `layer_dir/unitigs.bin`            → Implicit with warning (old index)
+    /// 4. `layer_dir/layer_meta.json`            → Implicit (new index)
+    /// 5. `layer_dir/unitigs.bin`                → Implicit with warning (old index)
     pub fn open(layer_dir: &Path) -> io::Result<Self> {
         let presence_dir = layer_dir.join("presence");
 
         if presence_dir.join("matrix.pbmx").exists() {
-            return Ok(Self::Packed(PackedBitMatrix::open(&presence_dir.join("matrix.pbmx"))?));
+            let m = PackedBitMatrix::open(&presence_dir.join("matrix.pbmx"))?;
+            eprintln!("[DIAG] PersistentBitMatrix::open PACKED layer={} n_rows={} n_cols={}", layer_dir.display(), m.n_rows, m.n_cols);
+            return Ok(Self::Packed(m));
         }
 
         if MatrixMeta::load(&presence_dir).is_ok() {
-            return Ok(Self::Columnar(ColumnarBitMatrix::open(&presence_dir)?));
+            let m = ColumnarBitMatrix::open(&presence_dir)?;
+            eprintln!("[DIAG] PersistentBitMatrix::open COLUMNAR layer={} n={} n_cols={}", layer_dir.display(), m.n(), m.n_cols());
+            return Ok(Self::Columnar(m));
+        }
+
+        if presence_dir.join("sparse_meta.json").exists() {
+            let m = PersistentSparseBitMatrix::open(&presence_dir)?;
+            eprintln!("[DIAG] PersistentBitMatrix::open SPARSE layer={} n={} n_cols={}", layer_dir.display(), m.n(), m.n_cols());
+            return Ok(Self::Sparse(m));
         }
 
         // No presence matrix → Implicit; requires layer_meta.json
@@ -52,6 +66,7 @@ impl PersistentBitMatrix {
                 layer_dir.display()
             ),
         ))?;
+        eprintln!("[DIAG] PersistentBitMatrix::open IMPLICIT layer={} n_rows={} n_cols=1", layer_dir.display(), meta.n);
         Ok(Self::Implicit { n_rows: meta.n, n_cols: 1 })
     }
 
@@ -60,6 +75,7 @@ impl PersistentBitMatrix {
         match self {
             Self::Columnar(m)            => m.n(),
             Self::Packed(m)              => m.n_rows,
+            Self::Sparse(m)              => m.n(),
             Self::Implicit { n_rows, .. } => *n_rows,
         }
     }
@@ -69,6 +85,7 @@ impl PersistentBitMatrix {
         match self {
             Self::Columnar(m)            => m.n_cols(),
             Self::Packed(m)              => m.n_cols,
+            Self::Sparse(m)              => m.n_cols(),
             Self::Implicit { n_cols, .. } => *n_cols,
         }
     }
@@ -86,6 +103,7 @@ impl PersistentBitMatrix {
         match self {
             Self::Columnar(m) => m.col(c).view(),
             Self::Packed(m)   => m.col_slice(c),
+            Self::Sparse(_)   => panic!("col_view() not available on Sparse PersistentBitMatrix"),
             Self::Implicit { .. } => panic!("col_view() not available on Implicit PersistentBitMatrix"),
         }
     }
@@ -100,6 +118,11 @@ impl PersistentBitMatrix {
         match self {
             Self::Columnar(m) => m.col(c).get(slot) as u32,
             Self::Packed(m)   => m.col_slice(c).get(slot) as u32,
+            Self::Sparse(m)   => {
+                let mut buf = vec![0u32; m.n_cols()];
+                m.fill_row(slot, &mut buf);
+                buf[c]
+            }
             Self::Implicit { .. } => 1,
         }
     }
@@ -108,6 +131,8 @@ impl PersistentBitMatrix {
         match self {
             Self::Columnar(m) => PersistentBitVecBuilder::build_from(m.col(c), path),
             Self::Packed(m)   => m.col_persist(c, path),
+            Self::Sparse(_)   => Err(io::Error::new(io::ErrorKind::Unsupported,
+                "col_persist not available on Sparse PersistentBitMatrix")),
             Self::Implicit { n_rows, .. } => {
                 PersistentBitVecBuilder::new_ones(*n_rows, path)
             }
@@ -119,6 +144,7 @@ impl PersistentBitMatrix {
         match self {
             Self::Columnar(m)             => m.row(slot),
             Self::Packed(m)               => m.row(slot),
+            Self::Sparse(m)               => m.row(slot),
             Self::Implicit { n_cols, .. } => vec![true; *n_cols].into_boxed_slice(),
         }
     }
@@ -129,6 +155,7 @@ impl PersistentBitMatrix {
         match self {
             Self::Columnar(m)             => m.fill_row(slot, buf),
             Self::Packed(m)               => m.fill_row(slot, buf),
+            Self::Sparse(m)               => m.fill_row(slot, buf),
             Self::Implicit { n_cols, .. } => buf[..*n_cols].fill(1),
         }
     }
@@ -147,6 +174,13 @@ impl PersistentBitMatrix {
             match self {
                 Self::Columnar(m) => m.col(c).view().fill_batch(slots, &mut col_buf),
                 Self::Packed(m)   => m.col_slice(c).fill_batch(slots, &mut col_buf),
+                Self::Sparse(m)   => {
+                    let mut row_buf = vec![false; m.n_cols()];
+                    for (i, &slot) in slots.iter().enumerate() {
+                        m.fill_row_bool(slot, &mut row_buf);
+                        col_buf[i] = row_buf[c];
+                    }
+                }
                 Self::Implicit { .. } => col_buf.iter_mut().for_each(|b| *b = true),
             }
             out.push(col_buf);
@@ -176,27 +210,39 @@ impl PersistentBitMatrix {
             match self {
                 Self::Columnar(m) => m.col(c).view().fill_batch_sorted(&sorted_slots, &mut tmp),
                 Self::Packed(m)   => m.col_slice(c).fill_batch_sorted(&sorted_slots, &mut tmp),
+                Self::Sparse(m)   => {
+                    for (i, &orig_idx) in perm.iter().enumerate() {
+                        let slot = sorted_slots[i];
+                        let mut row_buf = vec![false; m.n_cols()];
+                        m.fill_row_bool(slot, &mut row_buf);
+                        col[orig_idx] = row_buf[c];
+                    }
+                }
                 Self::Implicit { .. } => tmp.iter_mut().for_each(|b| *b = true),
             }
             for (i, &orig_idx) in perm.iter().enumerate() {
+                if !matches!(self, Self::Sparse(_)) {
                     col[orig_idx] = tmp[i];
                 }
             }
         }
+    }
 
     #[inline]
     pub fn count_ones(&self) -> Array1<u64> {
         match self {
             Self::Columnar(m)              => m.count_ones(),
             Self::Packed(m)                => m.count_ones(),
+            Self::Sparse(m)                => m.count_ones(),
             Self::Implicit { n_rows, n_cols } => Array1::from_elem(*n_cols, *n_rows as u64),
         }
     }
 
     pub fn partial_jaccard_dist_matrix(&self) -> (Array2<u64>, Array2<u64>) {
-        match self {
+        let result = match self {
             Self::Columnar(m)                 => m.partial_jaccard_dist_matrix(),
             Self::Packed(m)                   => m.partial_jaccard_dist_matrix(),
+            Self::Sparse(m)                   => BitPartials::partial_jaccard(m),
             Self::Implicit { n_rows, n_cols } => {
                 let v = *n_rows as u64;
                 let n = *n_cols;
@@ -207,15 +253,22 @@ impl PersistentBitMatrix {
                 }}
                 (inter, union)
             }
-        }
+        };
+        eprintln!("[DIAG] PersistentBitMatrix::partial_jaccard_dist_matrix self.n_cols={} result={}x{} / {}x{}",
+            self.n_cols(), result.0.shape()[0], result.0.shape()[1], result.1.shape()[0], result.1.shape()[1]);
+        result
     }
 
     pub fn partial_hamming_dist_matrix(&self) -> Array2<u64> {
-        match self {
+        let result = match self {
             Self::Columnar(m)              => m.partial_hamming_dist_matrix(),
             Self::Packed(m)                => m.partial_hamming_dist_matrix(),
+            Self::Sparse(m)                => BitPartials::partial_hamming(m),
             Self::Implicit { n_cols, .. }  => Array2::zeros((*n_cols, *n_cols)),
-        }
+        };
+        eprintln!("[DIAG] PersistentBitMatrix::partial_hamming_dist_matrix self.n_cols={} result={}x{}",
+            self.n_cols(), result.shape()[0], result.shape()[1]);
+        result
     }
 
     /// Append a new column to an on-disk Columnar matrix.

src/obicompactvec/src/bitmatrix/sparse.rs

@@ -25,8 +25,9 @@ use std::fs;
 use std::io;
 use std::path::{Path, PathBuf};
 
-use ndarray::Array1;
+use ndarray::{Array1, Array2};
 
+use crate::traits::{BitPartials, ColumnWeights};
 use crate::eliasfano::{EliasFano, EliasFanoBuilder};
 use crate::fixedintvec::{PersistentFixedIntVec, PersistentFixedIntVecBuilder, bit_width_for_range};
 use crate::meta::field;
@@ -174,7 +175,7 @@ impl PersistentSparseBitMatrix {
         }
     }
 
-    fn fill_row_bool(&self, slot: usize, buf: &mut [bool]) {
+    pub(crate) fn fill_row_bool(&self, slot: usize, buf: &mut [bool]) {
         buf.fill(false);
         if self.is_multi.get(slot) {
             let pos = self.is_multi.rank1(slot) as usize;
@@ -372,7 +373,64 @@ impl PersistentSparseBitMatrixBuilder {
     }
 }
 
-/// `pack --sparse`'s entry point: converts a presence directory into the
+// ── Trait impls ───────────────────────────────────────────────────────────────
+
+impl ColumnWeights for PersistentSparseBitMatrix {
+    fn col_weights(&self) -> Array1<u64> {
+        self.count_ones()
+    }
+}
+
+impl BitPartials for PersistentSparseBitMatrix {
+    fn partial_jaccard(&self) -> (Array2<u64>, Array2<u64>) {
+        let n = self.n_cols();
+        let mut inter = Array2::<u64>::zeros((n, n));
+        let mut buf = vec![0u32; n];
+        for slot in 0..self.n() {
+            self.fill_row(slot, &mut buf);
+            let present: Vec<usize> = buf.iter().enumerate().filter(|&(_, &v)| v != 0).map(|(c, _)| c).collect();
+            for (p, &i) in present.iter().enumerate() {
+                for &j in present.iter().skip(p) {
+                    inter[[i, j]] += 1;
+                    inter[[j, i]] += 1;
+                }
+            }
+        }
+        let col_weights = self.count_ones();
+        let mut union = Array2::zeros((n, n));
+        for i in 0..n {
+            for j in 0..n {
+                union[[i, j]] = col_weights[i] + col_weights[j] - inter[[i, j]];
+            }
+        }
+        (inter, union)
+    }
+
+    fn partial_hamming(&self) -> Array2<u64> {
+        let n = self.n_cols();
+        let mut inter = Array2::<u64>::zeros((n, n));
+        let mut buf = vec![0u32; n];
+        for slot in 0..self.n() {
+            self.fill_row(slot, &mut buf);
+            let present: Vec<usize> = buf.iter().enumerate().filter(|&(_, &v)| v != 0).map(|(c, _)| c).collect();
+            for (p, &i) in present.iter().enumerate() {
+                for &j in present.iter().skip(p) {
+                    inter[[i, j]] += 1;
+                    inter[[j, i]] += 1;
+                }
+            }
+        }
+        let col_weights = self.count_ones();
+        let total = self.n() as u64;
+        let mut m = Array2::zeros((n, n));
+        for i in 0..n {
+            for j in 0..n {
+                m[[i, j]] = total - (col_weights[i] + col_weights[j] - inter[[i, j]]);
+            }
+        }
+        m
+    }
+}
 /// sparse on-disk format in place, mirroring [`super::pack_bit_matrix`]'s
 /// convention (old-format files removed only after the new format is
 /// fully written, so a crash mid-conversion leaves the previous, still

src/obicompactvec/src/traits.rs

@@ -166,6 +166,7 @@ pub trait BitPartials: ColumnWeights {
     fn jaccard_dist_matrix(&self) -> Array2<f64> {
         let (inter, union) = self.partial_jaccard();
         let n = inter.shape()[0];
+        eprintln!("[TRACE] BitPartials::jaccard_dist_matrix finalising: n={}", n);
         let mut m = Array2::<f64>::zeros((n, n));
         for i in 0..n {
             for j in 0..n {
@@ -182,7 +183,9 @@ pub trait BitPartials: ColumnWeights {
     /// Mash distance (https://mash.readthedocs.io/en/latest/distances.html), derived
     /// from the Jaccard distance.
     fn mash_dist_matrix(&self, k: usize) -> Array2<f64> {
-        jaccard_to_mash(&self.jaccard_dist_matrix(), k)
+        let j = self.jaccard_dist_matrix();
+        eprintln!("[TRACE] BitPartials::mash_dist_matrix jaccard shape={}x{}", j.shape()[0], j.shape()[1]);
+        jaccard_to_mash(&j, k)
     }
 
     fn hamming_dist_matrix(&self) -> Array2<u64> {

src/obikindex/src/distance.rs

@@ -121,6 +121,7 @@ impl KmerIndex {
                     )));
                 }
             };
+            tracing::info!("distance matrix final: {}x{}", matrix.shape()[0], matrix.shape()[1]);
 
             let shared = if shared_kmers {
                 let (inter, _) = BitPartials::partial_jaccard(&global);

src/obikmer/src/cmd/phylo/mod.rs

@@ -294,12 +294,17 @@ pub fn run(args: PhyloArgs) {
 
     // ── Distance matrix → CSV ─────────────────────────────────────────────────
     let write_dist_csv = |w: &mut dyn Write| {
+        let matrix_shape = result.matrix.shape();
+        eprintln!("[DIAG] write_dist_csv: matrix_shape={}x{} labels.len()={} n={}", matrix_shape[0], matrix_shape[1], labels.len(), n);
         write!(w, "genome").unwrap();
         for g in &labels { write!(w, ",{g}").unwrap(); }
         writeln!(w).unwrap();
         for (i, g) in labels.iter().enumerate() {
             write!(w, "{g}").unwrap();
             for j in 0..n {
+                if i >= matrix_shape[0] || j >= matrix_shape[1] {
+                    eprintln!("[DIAG] OUT OF BOUNDS: i={} j={} matrix={}x{}", i, j, matrix_shape[0], matrix_shape[1]);
+                }
                 write!(w, ",{:.6}", result.matrix[[i, j]]).unwrap();
             }
             writeln!(w).unwrap();

src/obilayeredmap/src/layered_store.rs

@@ -22,10 +22,16 @@ impl<S> LayeredStore<S> {
 
 impl<S: ColumnWeights> ColumnWeights for LayeredStore<S> {
     fn col_weights(&self) -> Array1<u64> {
-        self.0.par_iter()
+        let parts: Vec<Array1<u64>> = self.0.par_iter()
             .map(|s| s.col_weights())
-            .reduce_with(|a, b| a + b)
+            .collect();
-            .unwrap_or_else(|| Array1::zeros(0))
+        for (i, w) in parts.iter().enumerate() {
+            eprintln!("layered_store col_weights layer={i} len={}", w.len());
+        }
+        let result = parts.into_iter().reduce(|a, b| a + b)
+            .unwrap_or_else(|| Array1::zeros(0));
+        eprintln!("layered_store col_weights reduced len={}", result.len());
+        result
     }
 }
 
@@ -33,45 +39,87 @@ impl<S: ColumnWeights> ColumnWeights for LayeredStore<S> {
 
 impl<S: CountPartials> CountPartials for LayeredStore<S> {
     fn partial_bray(&self) -> Array2<u64> {
-        self.0.par_iter()
+        let parts: Vec<_> = self.0.par_iter()
             .map(|s| s.partial_bray())
-            .reduce_with(|a, b| a + b)
+            .collect();
-            .unwrap()
+        for (i, m) in parts.iter().enumerate() {
+            eprintln!("layered_store partial_bray layer={i} {}x{}",
+                m.shape()[0], m.shape()[1]);
+        }
+        let result = parts.into_iter().reduce(|a, b| a + b).unwrap();
+        eprintln!("layered_store partial_bray reduced {}x{}",
+            result.shape()[0], result.shape()[1]);
+        result
     }
 
     fn partial_euclidean(&self) -> Array2<f64> {
-        self.0.par_iter()
+        let parts: Vec<_> = self.0.par_iter()
             .map(|s| s.partial_euclidean())
-            .reduce_with(|a, b| a + b)
+            .collect();
-            .unwrap()
+        for (i, m) in parts.iter().enumerate() {
+            eprintln!("layered_store partial_euclidean layer={i} {}x{}",
+                m.shape()[0], m.shape()[1]);
+        }
+        let result = parts.into_iter().reduce(|a, b| a + b).unwrap();
+        eprintln!("layered_store partial_euclidean reduced {}x{}",
+            result.shape()[0], result.shape()[1]);
+        result
     }
 
     fn partial_threshold_jaccard(&self, threshold: u32) -> (Array2<u64>, Array2<u64>) {
-        self.0.par_iter()
+        let parts: Vec<_> = self.0.par_iter()
             .map(|s| s.partial_threshold_jaccard(threshold))
-            .reduce_with(|(ai, au), (bi, bu)| (ai + bi, au + bu))
+            .collect();
-            .unwrap()
+        for (i, (inter, union)) in parts.iter().enumerate() {
+            eprintln!("layered_store partial_threshold_jaccard layer={i} threshold={threshold} inter={}x{} union={}x{}",
+                inter.shape()[0], inter.shape()[1], union.shape()[0], union.shape()[1]);
+        }
+        let (ai, au) = parts.into_iter().reduce(|(ai, au), (bi, bu)| (ai + bi, au + bu)).unwrap();
+        eprintln!("layered_store partial_threshold_jaccard reduced threshold={threshold} inter={}x{} union={}x{}",
+            ai.shape()[0], ai.shape()[1], au.shape()[0], au.shape()[1]);
+        (ai, au)
     }
 
     fn partial_relfreq_bray(&self, global: &Array1<u64>) -> Array2<f64> {
-        self.0.par_iter()
+        let parts: Vec<_> = self.0.par_iter()
             .map(|s| s.partial_relfreq_bray(global))
-            .reduce_with(|a, b| a + b)
+            .collect();
-            .unwrap()
+        for (i, m) in parts.iter().enumerate() {
+            eprintln!("layered_store partial_relfreq_bray layer={i} {}x{}",
+                m.shape()[0], m.shape()[1]);
+        }
+        let result = parts.into_iter().reduce(|a, b| a + b).unwrap();
+        eprintln!("layered_store partial_relfreq_bray reduced {}x{}",
+            result.shape()[0], result.shape()[1]);
+        result
     }
 
     fn partial_relfreq_euclidean(&self, global: &Array1<u64>) -> Array2<f64> {
-        self.0.par_iter()
+        let parts: Vec<_> = self.0.par_iter()
             .map(|s| s.partial_relfreq_euclidean(global))
-            .reduce_with(|a, b| a + b)
+            .collect();
-            .unwrap()
+        for (i, m) in parts.iter().enumerate() {
+            eprintln!("layered_store partial_relfreq_euclidean layer={i} {}x{}",
+                m.shape()[0], m.shape()[1]);
+        }
+        let result = parts.into_iter().reduce(|a, b| a + b).unwrap();
+        eprintln!("layered_store partial_relfreq_euclidean reduced {}x{}",
+            result.shape()[0], result.shape()[1]);
+        result
     }
 
     fn partial_hellinger(&self, global: &Array1<u64>) -> Array2<f64> {
-        self.0.par_iter()
+        let parts: Vec<_> = self.0.par_iter()
             .map(|s| s.partial_hellinger(global))
-            .reduce_with(|a, b| a + b)
+            .collect();
-            .unwrap()
+        for (i, m) in parts.iter().enumerate() {
+            eprintln!("layered_store partial_hellinger layer={i} {}x{}",
+                m.shape()[0], m.shape()[1]);
+        }
+        let result = parts.into_iter().reduce(|a, b| a + b).unwrap();
+        eprintln!("layered_store partial_hellinger reduced {}x{}",
+            result.shape()[0], result.shape()[1]);
+        result
     }
 }
 
@@ -79,17 +127,31 @@ impl<S: CountPartials> CountPartials for LayeredStore<S> {
 
 impl<S: BitPartials> BitPartials for LayeredStore<S> {
     fn partial_jaccard(&self) -> (Array2<u64>, Array2<u64>) {
-        self.0.par_iter()
+        let parts: Vec<_> = self.0.par_iter()
             .map(|s| s.partial_jaccard())
-            .reduce_with(|(ai, au), (bi, bu)| (ai + bi, au + bu))
+            .collect();
-            .unwrap()
+        for (i, (inter, union)) in parts.iter().enumerate() {
+            eprintln!("layered_store partial_jaccard layer={i} inter={}x{} union={}x{}",
+                inter.shape()[0], inter.shape()[1], union.shape()[0], union.shape()[1]);
+        }
+        let (ai, au) = parts.into_iter().reduce(|(ai, au), (bi, bu)| (ai + bi, au + bu)).unwrap();
+        eprintln!("layered_store partial_jaccard reduced inter={}x{} union={}x{}",
+            ai.shape()[0], ai.shape()[1], au.shape()[0], au.shape()[1]);
+        (ai, au)
     }
 
     fn partial_hamming(&self) -> Array2<u64> {
-        self.0.par_iter()
+        let parts: Vec<_> = self.0.par_iter()
             .map(|s| s.partial_hamming())
-            .reduce_with(|a, b| a + b)
+            .collect();
-            .unwrap()
+        for (i, m) in parts.iter().enumerate() {
+            eprintln!("layered_store partial_hamming layer={i} {}x{}",
+                m.shape()[0], m.shape()[1]);
+        }
+        let result = parts.into_iter().reduce(|a, b| a + b).unwrap();
+        eprintln!("layered_store partial_hamming reduced {}x{}",
+            result.shape()[0], result.shape()[1]);
+        result
     }
 }