Fix coordinates in hgvs annotations.
[lightning.git] / slicenumpy.go
index 557f0c55911d694436a29200ef1571aa62a7004e..82cfff75ce9edc9f3ca3e1357956ac0b3ea3b635 100644 (file)
@@ -7,21 +7,25 @@ package lightning
 import (
        "bufio"
        "bytes"
+       "encoding/gob"
        "flag"
        "fmt"
        "io"
+       "io/ioutil"
        "net/http"
        _ "net/http/pprof"
        "os"
+       "regexp"
        "runtime"
+       "runtime/debug"
        "sort"
+       "strconv"
        "strings"
        "sync/atomic"
 
        "git.arvados.org/arvados.git/sdk/go/arvados"
        "github.com/arvados/lightning/hgvs"
        "github.com/kshedden/gonpy"
-       "github.com/sirupsen/logrus"
        log "github.com/sirupsen/logrus"
        "golang.org/x/crypto/blake2b"
 )
@@ -49,6 +53,9 @@ func (cmd *sliceNumpy) RunCommand(prog string, args []string, stdin io.Reader, s
        ref := flags.String("ref", "", "reference name (if blank, choose last one that appears in input)")
        regionsFilename := flags.String("regions", "", "only output columns/annotations that intersect regions in specified bed `file`")
        expandRegions := flags.Int("expand-regions", 0, "expand specified regions by `N` base pairs on each side`")
+       mergeOutput := flags.Bool("merge-output", false, "merge output into one matrix.npy and one matrix.annotations.csv")
+       hgvsSingle := flags.Bool("single-hgvs-matrix", false, "also generate hgvs-based matrix")
+       hgvsChunked := flags.Bool("chunked-hgvs-matrix", false, "also generate hgvs-based matrix per chromosome")
        flags.IntVar(&cmd.threads, "threads", 16, "number of memory-hungry assembly threads")
        cmd.filter.Flags(flags)
        err = flags.Parse(args)
@@ -70,8 +77,8 @@ func (cmd *sliceNumpy) RunCommand(prog string, args []string, stdin io.Reader, s
                        Name:        "lightning slice-numpy",
                        Client:      arvados.NewClientFromEnv(),
                        ProjectUUID: *projectUUID,
-                       RAM:         240000000000,
-                       VCPUs:       64,
+                       RAM:         750000000000,
+                       VCPUs:       96,
                        Priority:    *priority,
                        KeepCache:   2,
                        APIAccess:   true,
@@ -81,12 +88,15 @@ func (cmd *sliceNumpy) RunCommand(prog string, args []string, stdin io.Reader, s
                        return 1
                }
                runner.Args = []string{"slice-numpy", "-local=true",
-                       "-pprof", ":6060",
-                       "-input-dir", *inputDir,
-                       "-output-dir", "/mnt/output",
-                       "-threads", fmt.Sprintf("%d", cmd.threads),
-                       "-regions", *regionsFilename,
-                       "-expand-regions", fmt.Sprintf("%d", *expandRegions),
+                       "-pprof=:6060",
+                       "-input-dir=" + *inputDir,
+                       "-output-dir=/mnt/output",
+                       "-threads=" + fmt.Sprintf("%d", cmd.threads),
+                       "-regions=" + *regionsFilename,
+                       "-expand-regions=" + fmt.Sprintf("%d", *expandRegions),
+                       "-merge-output=" + fmt.Sprintf("%v", *mergeOutput),
+                       "-single-hgvs-matrix=" + fmt.Sprintf("%v", *hgvsSingle),
+                       "-chunked-hgvs-matrix=" + fmt.Sprintf("%v", *hgvsChunked),
                }
                runner.Args = append(runner.Args, cmd.filter.Args()...)
                var output string
@@ -110,10 +120,18 @@ func (cmd *sliceNumpy) RunCommand(prog string, args []string, stdin io.Reader, s
 
        var cgnames []string
        var refseq map[string][]tileLibRef
+       var reftiledata = make(map[tileLibRef][]byte, 11000000)
        in0, err := open(infiles[0])
        if err != nil {
                return 1
        }
+
+       matchGenome, err := regexp.Compile(cmd.filter.MatchGenome)
+       if err != nil {
+               err = fmt.Errorf("-match-genome: invalid regexp: %q", cmd.filter.MatchGenome)
+               return 1
+       }
+
        taglen := -1
        DecodeLibrary(in0, strings.HasSuffix(infiles[0], ".gz"), func(ent *LibraryEntry) error {
                if len(ent.TagSet) > 0 {
@@ -125,7 +143,14 @@ func (cmd *sliceNumpy) RunCommand(prog string, args []string, stdin io.Reader, s
                        }
                }
                for _, cg := range ent.CompactGenomes {
-                       cgnames = append(cgnames, cg.Name)
+                       if matchGenome.MatchString(cg.Name) {
+                               cgnames = append(cgnames, cg.Name)
+                       }
+               }
+               for _, tv := range ent.TileVariants {
+                       if tv.Ref {
+                               reftiledata[tileLibRef{tv.Tag, tv.Variant}] = tv.Sequence
+                       }
                }
                return nil
        })
@@ -141,6 +166,10 @@ func (cmd *sliceNumpy) RunCommand(prog string, args []string, stdin io.Reader, s
                err = fmt.Errorf("tagset not found")
                return 1
        }
+       if len(cgnames) == 0 {
+               err = fmt.Errorf("no genomes found matching regexp %q", cmd.filter.MatchGenome)
+               return 1
+       }
        sort.Strings(cgnames)
 
        {
@@ -166,61 +195,96 @@ func (cmd *sliceNumpy) RunCommand(prog string, args []string, stdin io.Reader, s
                }
        }
 
-       log.Info("building list of reference tiles to load") // TODO: more efficient if we had saved all ref tiles in slice0
+       log.Info("indexing reference tiles")
        type reftileinfo struct {
                variant  tileVariantID
                seqname  string // chr1
-               pos      int    // distance from start of chr1 to start of tile
+               pos      int    // distance from start of chromosome to starttag
                tiledata []byte // acgtggcaa...
        }
+       isdup := map[tagID]bool{}
        reftile := map[tagID]*reftileinfo{}
        for seqname, cseq := range refseq {
+               pos := 0
                for _, libref := range cseq {
-                       reftile[libref.Tag] = &reftileinfo{seqname: seqname, variant: libref.Variant}
+                       tiledata := reftiledata[libref]
+                       if len(tiledata) == 0 {
+                               err = fmt.Errorf("missing tiledata for tag %d variant %d in %s in ref", libref.Tag, libref.Variant, seqname)
+                               return 1
+                       }
+                       if isdup[libref.Tag] {
+                               log.Printf("dropping reference tile %+v from %s @ %d, tag not unique", libref, seqname, pos)
+                       } else if reftile[libref.Tag] != nil {
+                               log.Printf("dropping reference tile %+v from %s @ %d, tag not unique", tileLibRef{Tag: libref.Tag, Variant: reftile[libref.Tag].variant}, reftile[libref.Tag].seqname, reftile[libref.Tag].pos)
+                               delete(reftile, libref.Tag)
+                               log.Printf("dropping reference tile %+v from %s @ %d, tag not unique", libref, seqname, pos)
+                               isdup[libref.Tag] = true
+                       } else {
+                               reftile[libref.Tag] = &reftileinfo{
+                                       seqname:  seqname,
+                                       variant:  libref.Variant,
+                                       tiledata: tiledata,
+                                       pos:      pos,
+                               }
+                       }
+                       pos += len(tiledata) - taglen
                }
+               log.Printf("... %s done, len %d", seqname, pos+taglen)
        }
-       log.Info("loading reference tiles from all slices")
-       throttleCPU := throttle{Max: runtime.GOMAXPROCS(0)}
-       for _, infile := range infiles {
-               infile := infile
-               throttleCPU.Go(func() error {
-                       defer log.Infof("%s: done", infile)
-                       f, err := open(infile)
+
+       var mask *mask
+       if *regionsFilename != "" {
+               log.Printf("loading regions from %s", *regionsFilename)
+               mask, err = makeMask(*regionsFilename, *expandRegions)
+               if err != nil {
+                       return 1
+               }
+               log.Printf("before applying mask, len(reftile) == %d", len(reftile))
+               log.Printf("deleting reftile entries for regions outside %d intervals", mask.Len())
+               for tag, rt := range reftile {
+                       if !mask.Check(strings.TrimPrefix(rt.seqname, "chr"), rt.pos, rt.pos+len(rt.tiledata)) {
+                               delete(reftile, tag)
+                       }
+               }
+               log.Printf("after applying mask, len(reftile) == %d", len(reftile))
+       }
+
+       type hgvsColSet map[hgvs.Variant][2][]int8
+       encodeHGVS := throttle{Max: len(refseq)}
+       encodeHGVSTodo := map[string]chan hgvsColSet{}
+       tmpHGVSCols := map[string]*os.File{}
+       if *hgvsChunked {
+               for seqname := range refseq {
+                       var f *os.File
+                       f, err = os.Create(*outputDir + "/tmp." + seqname + ".gob")
                        if err != nil {
-                               return err
+                               return 1
                        }
-                       defer f.Close()
-                       return DecodeLibrary(f, strings.HasSuffix(infile, ".gz"), func(ent *LibraryEntry) error {
-                               for _, tv := range ent.TileVariants {
-                                       if dst, ok := reftile[tv.Tag]; ok && dst.variant == tv.Variant {
-                                               dst.tiledata = tv.Sequence
+                       defer os.Remove(f.Name())
+                       bufw := bufio.NewWriterSize(f, 1<<24)
+                       enc := gob.NewEncoder(bufw)
+                       tmpHGVSCols[seqname] = f
+                       todo := make(chan hgvsColSet, 128)
+                       encodeHGVSTodo[seqname] = todo
+                       encodeHGVS.Go(func() error {
+                               for colset := range todo {
+                                       err := enc.Encode(colset)
+                                       if err != nil {
+                                               encodeHGVS.Report(err)
+                                               for range todo {
+                                               }
+                                               return err
                                        }
                                }
-                               return nil
+                               return bufw.Flush()
                        })
-               })
-       }
-       if err = throttleCPU.Wait(); err != nil {
-               return 1
+               }
        }
 
-       log.Info("reconstructing reference sequences")
-       for seqname, cseq := range refseq {
-               seqname, cseq := seqname, cseq
-               throttleCPU.Go(func() error {
-                       defer log.Printf("... %s done", seqname)
-                       pos := 0
-                       for _, libref := range cseq {
-                               rt := reftile[libref.Tag]
-                               rt.pos = pos
-                               pos += len(rt.tiledata) - taglen
-                       }
-                       return nil
-               })
+       var toMerge [][]int16
+       if *mergeOutput || *hgvsSingle {
+               toMerge = make([][]int16, len(infiles))
        }
-       throttleCPU.Wait()
-
-       log.Info("TODO: determining which tiles intersect given regions")
 
        throttleMem := throttle{Max: cmd.threads} // TODO: estimate using mem and data size
        throttleNumpyMem := throttle{Max: cmd.threads/2 + 1}
@@ -236,9 +300,18 @@ func (cmd *sliceNumpy) RunCommand(prog string, args []string, stdin io.Reader, s
                                return err
                        }
                        defer f.Close()
-                       log.Infof("reading %s", infile)
+                       log.Infof("%04d: reading %s", infileIdx, infile)
                        err = DecodeLibrary(f, strings.HasSuffix(infile, ".gz"), func(ent *LibraryEntry) error {
                                for _, tv := range ent.TileVariants {
+                                       if tv.Ref {
+                                               continue
+                                       }
+                                       if mask != nil && reftile[tv.Tag] == nil {
+                                               // Don't waste
+                                               // time/memory on
+                                               // masked-out tiles.
+                                               continue
+                                       }
                                        variants := seq[tv.Tag]
                                        if len(variants) == 0 {
                                                variants = make([]TileVariant, 100)
@@ -250,6 +323,15 @@ func (cmd *sliceNumpy) RunCommand(prog string, args []string, stdin io.Reader, s
                                        seq[tv.Tag] = variants
                                }
                                for _, cg := range ent.CompactGenomes {
+                                       if !matchGenome.MatchString(cg.Name) {
+                                               continue
+                                       }
+                                       // pad to full slice size
+                                       // to avoid out-of-bounds
+                                       // checks later
+                                       if sliceSize := 2 * int(cg.EndTag-cg.StartTag); len(cg.Variants) < sliceSize {
+                                               cg.Variants = append(cg.Variants, make([]tileVariantID, sliceSize-len(cg.Variants))...)
+                                       }
                                        cgs[cg.Name] = cg
                                }
                                return nil
@@ -262,7 +344,7 @@ func (cmd *sliceNumpy) RunCommand(prog string, args []string, stdin io.Reader, s
 
                        // TODO: filters
 
-                       log.Infof("renumber/dedup variants for tags %d-%d", tagstart, tagend)
+                       log.Infof("%04d: renumber/dedup variants for tags %d-%d", infileIdx, tagstart, tagend)
                        variantRemap := make([][]tileVariantID, tagend-tagstart)
                        throttleCPU := throttle{Max: runtime.GOMAXPROCS(0)}
                        for tag, variants := range seq {
@@ -271,11 +353,19 @@ func (cmd *sliceNumpy) RunCommand(prog string, args []string, stdin io.Reader, s
                                go func() {
                                        defer throttleCPU.Release()
                                        count := make(map[[blake2b.Size256]byte]int, len(variants))
+
+                                       rt := reftile[tag]
+                                       if rt != nil {
+                                               count[blake2b.Sum256(rt.tiledata)] = 0
+                                       }
+
                                        for _, cg := range cgs {
-                                               idx := (tag - tagstart) * 2
-                                               if int(idx) < len(cg.Variants) {
-                                                       count[variants[cg.Variants[idx]].Blake2b]++
-                                                       count[variants[cg.Variants[idx+1]].Blake2b]++
+                                               idx := int(tag-tagstart) * 2
+                                               for allele := 0; allele < 2; allele++ {
+                                                       v := cg.Variants[idx+allele]
+                                                       if v > 0 && len(variants[v].Sequence) > 0 {
+                                                               count[variants[v].Blake2b]++
+                                                       }
                                                }
                                        }
                                        // hash[i] will be the hash of
@@ -308,42 +398,118 @@ func (cmd *sliceNumpy) RunCommand(prog string, args []string, stdin io.Reader, s
                                                remap[i] = rank[tv.Blake2b]
                                        }
                                        variantRemap[tag-tagstart] = remap
+                                       if rt != nil {
+                                               rt.variant = rank[blake2b.Sum256(rt.tiledata)]
+                                       }
                                }()
                        }
                        throttleCPU.Wait()
 
                        annotationsFilename := fmt.Sprintf("%s/matrix.%04d.annotations.csv", *outputDir, infileIdx)
-                       log.Infof("writing %s", annotationsFilename)
+                       log.Infof("%04d: writing %s", infileIdx, annotationsFilename)
                        annof, err := os.Create(annotationsFilename)
                        if err != nil {
                                return err
                        }
                        annow := bufio.NewWriterSize(annof, 1<<20)
-                       for tag, variants := range seq {
+                       outcol := 0
+                       for tag := tagstart; tag < tagend; tag++ {
                                rt, ok := reftile[tag]
                                if !ok {
-                                       // Reference does not use any
-                                       // variant of this tile.
-                                       // TODO: log this? mention it
-                                       // in annotations?
+                                       if mask == nil {
+                                               outcol++
+                                       }
+                                       // Excluded by specified
+                                       // regions, or reference does
+                                       // not use any variant of this
+                                       // tile. (TODO: log this?
+                                       // mention it in annotations?)
                                        continue
                                }
-                               outcol := tag - tagID(tagstart)
+                               fmt.Fprintf(annow, "%d,%d,%d,=,%s,%d,,,\n", tag, outcol, rt.variant, rt.seqname, rt.pos)
+                               variants := seq[tag]
                                reftilestr := strings.ToUpper(string(rt.tiledata))
                                remap := variantRemap[tag-tagstart]
+                               maxv := tileVariantID(0)
+                               for _, v := range remap {
+                                       if maxv < v {
+                                               maxv = v
+                                       }
+                               }
+                               done := make([]bool, maxv+1)
+                               variantDiffs := make([][]hgvs.Variant, maxv+1)
                                for v, tv := range variants {
+                                       v := remap[v]
+                                       if v == rt.variant || done[v] {
+                                               continue
+                                       } else {
+                                               done[v] = true
+                                       }
                                        if len(tv.Sequence) < taglen || !bytes.HasSuffix(rt.tiledata, tv.Sequence[len(tv.Sequence)-taglen:]) {
+                                               fmt.Fprintf(annow, "%d,%d,%d,,%s,%d,,,\n", tag, outcol, v, rt.seqname, rt.pos)
                                                continue
                                        }
                                        if lendiff := len(rt.tiledata) - len(tv.Sequence); lendiff < -1000 || lendiff > 1000 {
+                                               fmt.Fprintf(annow, "%d,%d,%d,,%s,%d,,,\n", tag, outcol, v, rt.seqname, rt.pos)
                                                continue
                                        }
                                        diffs, _ := hgvs.Diff(reftilestr, strings.ToUpper(string(tv.Sequence)), 0)
+                                       for i := range diffs {
+                                               diffs[i].Position += rt.pos
+                                       }
                                        for _, diff := range diffs {
-                                               diff.Position += rt.pos
-                                               fmt.Fprintf(annow, "%d,%d,%d,%s:g.%s\n", tag, outcol, remap[v], rt.seqname, diff.String())
+                                               fmt.Fprintf(annow, "%d,%d,%d,%s:g.%s,%s,%d,%s,%s,%s\n", tag, outcol, v, rt.seqname, diff.String(), rt.seqname, diff.Position, diff.Ref, diff.New, diff.Left)
+                                       }
+                                       if *hgvsChunked {
+                                               variantDiffs[v] = diffs
                                        }
                                }
+                               if *hgvsChunked {
+                                       // We can now determine, for each HGVS
+                                       // variant (diff) in this reftile
+                                       // region, whether a given genome
+                                       // phase/allele (1) has the variant, (0) has
+                                       // =ref or a different variant in that
+                                       // position, or (-1) is lacking
+                                       // coverage / couldn't be diffed.
+                                       hgvsCol := hgvsColSet{}
+                                       for _, diffs := range variantDiffs {
+                                               for _, diff := range diffs {
+                                                       if _, ok := hgvsCol[diff]; ok {
+                                                               continue
+                                                       }
+                                                       hgvsCol[diff] = [2][]int8{
+                                                               make([]int8, len(cgnames)),
+                                                               make([]int8, len(cgnames)),
+                                                       }
+                                               }
+                                       }
+                                       for row, name := range cgnames {
+                                               variants := cgs[name].Variants[(tag-tagstart)*2:]
+                                               for ph := 0; ph < 2; ph++ {
+                                                       v := variants[ph]
+                                                       if int(v) >= len(remap) {
+                                                               v = 0
+                                                       } else {
+                                                               v = remap[v]
+                                                       }
+                                                       if v == rt.variant {
+                                                               // hgvsCol[*][ph][row] is already 0
+                                                       } else if len(variantDiffs[v]) == 0 {
+                                                               // lacking coverage / couldn't be diffed
+                                                               for _, col := range hgvsCol {
+                                                                       col[ph][row] = -1
+                                                               }
+                                                       } else {
+                                                               for _, diff := range variantDiffs[v] {
+                                                                       hgvsCol[diff][ph][row] = 1
+                                                               }
+                                                       }
+                                               }
+                                       }
+                                       encodeHGVSTodo[rt.seqname] <- hgvsCol
+                               }
+                               outcol++
                        }
                        err = annow.Flush()
                        if err != nil {
@@ -354,49 +520,43 @@ func (cmd *sliceNumpy) RunCommand(prog string, args []string, stdin io.Reader, s
                                return err
                        }
 
+                       log.Infof("%04d: preparing numpy", infileIdx)
                        throttleNumpyMem.Acquire()
-                       log.Infof("%s: preparing numpy", infile)
                        rows := len(cgnames)
-                       cols := 2 * int(tagend-tagstart)
+                       cols := 2 * outcol
                        out := make([]int16, rows*cols)
                        for row, name := range cgnames {
                                out := out[row*cols:]
+                               outcol := 0
                                for col, v := range cgs[name].Variants {
-                                       if variants, ok := seq[tagstart+tagID(col/2)]; ok && len(variants) > int(v) && len(variants[v].Sequence) > 0 {
-                                               out[col] = int16(variantRemap[col/2][v])
+                                       tag := tagstart + tagID(col/2)
+                                       if mask != nil && reftile[tag] == nil {
+                                               continue
+                                       }
+                                       if variants, ok := seq[tag]; ok && len(variants) > int(v) && len(variants[v].Sequence) > 0 {
+                                               out[outcol] = int16(variantRemap[tag-tagstart][v])
                                        } else {
-                                               out[col] = -1
+                                               out[outcol] = -1
                                        }
+                                       outcol++
                                }
                        }
                        seq = nil
+                       cgs = nil
+                       debug.FreeOSMemory()
                        throttleNumpyMem.Release()
 
-                       fnm := fmt.Sprintf("%s/matrix.%04d.npy", *outputDir, infileIdx)
-                       output, err := os.Create(fnm)
-                       if err != nil {
-                               return err
-                       }
-                       defer output.Close()
-                       bufw := bufio.NewWriterSize(output, 1<<26)
-                       npw, err := gonpy.NewWriter(nopCloser{bufw})
-                       if err != nil {
-                               return err
-                       }
-                       log.WithFields(logrus.Fields{
-                               "filename": fnm,
-                               "rows":     rows,
-                               "cols":     cols,
-                       }).Info("writing numpy")
-                       npw.Shape = []int{rows, cols}
-                       npw.WriteInt16(out)
-                       err = bufw.Flush()
-                       if err != nil {
-                               return err
+                       if *mergeOutput || *hgvsSingle {
+                               log.Infof("%04d: matrix fragment %d rows x %d cols", infileIdx, rows, cols)
+                               toMerge[infileIdx] = out
                        }
-                       err = output.Close()
-                       if err != nil {
-                               return err
+                       if !*mergeOutput {
+                               fnm := fmt.Sprintf("%s/matrix.%04d.npy", *outputDir, infileIdx)
+                               err = writeNumpyInt16(fnm, out, rows, cols)
+                               if err != nil {
+                                       return err
+                               }
+                               debug.FreeOSMemory()
                        }
                        log.Infof("%s: done (%d/%d)", infile, int(atomic.AddInt64(&done, 1)), len(infiles))
                        return nil
@@ -405,5 +565,296 @@ func (cmd *sliceNumpy) RunCommand(prog string, args []string, stdin io.Reader, s
        if err = throttleMem.Wait(); err != nil {
                return 1
        }
+
+       if *hgvsChunked {
+               log.Info("flushing hgvsCols temp files")
+               for seqname := range refseq {
+                       close(encodeHGVSTodo[seqname])
+               }
+               err = encodeHGVS.Wait()
+               if err != nil {
+                       return 1
+               }
+               for seqname := range refseq {
+                       log.Infof("%s: reading hgvsCols from temp file", seqname)
+                       f := tmpHGVSCols[seqname]
+                       _, err = f.Seek(0, io.SeekStart)
+                       if err != nil {
+                               return 1
+                       }
+                       var hgvsCols hgvsColSet
+                       dec := gob.NewDecoder(bufio.NewReaderSize(f, 1<<24))
+                       for err == nil {
+                               err = dec.Decode(&hgvsCols)
+                       }
+                       if err != io.EOF {
+                               return 1
+                       }
+                       log.Infof("%s: sorting %d hgvs variants", seqname, len(hgvsCols))
+                       variants := make([]hgvs.Variant, 0, len(hgvsCols))
+                       for v := range hgvsCols {
+                               variants = append(variants, v)
+                       }
+                       sort.Slice(variants, func(i, j int) bool {
+                               vi, vj := &variants[i], &variants[j]
+                               if vi.Position != vj.Position {
+                                       return vi.Position < vj.Position
+                               } else if vi.Ref != vj.Ref {
+                                       return vi.Ref < vj.Ref
+                               } else {
+                                       return vi.New < vj.New
+                               }
+                       })
+                       rows := len(cgnames)
+                       cols := len(variants) * 2
+                       log.Infof("%s: building hgvs matrix (rows=%d, cols=%d, mem=%d)", seqname, rows, cols, rows*cols)
+                       out := make([]int8, rows*cols)
+                       for varIdx, variant := range variants {
+                               hgvsCols := hgvsCols[variant]
+                               for row := range cgnames {
+                                       for ph := 0; ph < 2; ph++ {
+                                               out[row*cols+varIdx+ph] = hgvsCols[ph][row]
+                                       }
+                               }
+                       }
+                       err = writeNumpyInt8(fmt.Sprintf("%s/hgvs.%s.npy", *outputDir, seqname), out, rows, cols)
+                       if err != nil {
+                               return 1
+                       }
+                       out = nil
+
+                       fnm := fmt.Sprintf("%s/hgvs.%s.annotations.csv", *outputDir, seqname)
+                       log.Infof("%s: writing hgvs column labels to %s", seqname, fnm)
+                       var hgvsLabels bytes.Buffer
+                       for varIdx, variant := range variants {
+                               fmt.Fprintf(&hgvsLabels, "%d,%s:g.%s\n", varIdx, seqname, variant.String())
+                       }
+                       err = ioutil.WriteFile(fnm, hgvsLabels.Bytes(), 0666)
+                       if err != nil {
+                               return 1
+                       }
+               }
+       }
+
+       if *mergeOutput || *hgvsSingle {
+               var annow *bufio.Writer
+               var annof *os.File
+               if *mergeOutput {
+                       annoFilename := fmt.Sprintf("%s/matrix.annotations.csv", *outputDir)
+                       annof, err = os.Create(annoFilename)
+                       if err != nil {
+                               return 1
+                       }
+                       annow = bufio.NewWriterSize(annof, 1<<20)
+               }
+
+               rows := len(cgnames)
+               cols := 0
+               for _, chunk := range toMerge {
+                       cols += len(chunk) / rows
+               }
+               log.Infof("merging output matrix (rows=%d, cols=%d, mem=%d) and annotations", rows, cols, rows*cols*2)
+               var out []int16
+               if *mergeOutput {
+                       out = make([]int16, rows*cols)
+               }
+               hgvsCols := map[string][2][]int16{} // hgvs -> [[g0,g1,g2,...], [g0,g1,g2,...]] (slice of genomes for each phase)
+               startcol := 0
+               for outIdx, chunk := range toMerge {
+                       chunkcols := len(chunk) / rows
+                       if *mergeOutput {
+                               for row := 0; row < rows; row++ {
+                                       copy(out[row*cols+startcol:], chunk[row*chunkcols:(row+1)*chunkcols])
+                               }
+                       }
+                       toMerge[outIdx] = nil
+
+                       annotationsFilename := fmt.Sprintf("%s/matrix.%04d.annotations.csv", *outputDir, outIdx)
+                       log.Infof("reading %s", annotationsFilename)
+                       buf, err := os.ReadFile(annotationsFilename)
+                       if err != nil {
+                               return 1
+                       }
+                       if *mergeOutput {
+                               err = os.Remove(annotationsFilename)
+                               if err != nil {
+                                       return 1
+                               }
+                       }
+                       for _, line := range bytes.Split(buf, []byte{'\n'}) {
+                               if len(line) == 0 {
+                                       continue
+                               }
+                               fields := bytes.SplitN(line, []byte{','}, 9)
+                               tag, _ := strconv.Atoi(string(fields[0]))
+                               incol, _ := strconv.Atoi(string(fields[1]))
+                               tileVariant, _ := strconv.Atoi(string(fields[2]))
+                               hgvsID := string(fields[3])
+                               seqname := string(fields[4])
+                               pos, _ := strconv.Atoi(string(fields[5]))
+                               refseq := fields[6]
+                               if hgvsID == "" {
+                                       // Null entry for un-diffable
+                                       // tile variant
+                                       continue
+                               }
+                               if hgvsID == "=" {
+                                       // Null entry for ref tile
+                                       continue
+                               }
+                               if mask != nil && !mask.Check(strings.TrimPrefix(seqname, "chr"), pos, pos+len(refseq)) {
+                                       // The tile intersects one of
+                                       // the selected regions, but
+                                       // this particular HGVS
+                                       // variant does not.
+                                       continue
+                               }
+                               hgvsColPair := hgvsCols[hgvsID]
+                               if hgvsColPair[0] == nil {
+                                       // values in new columns start
+                                       // out as -1 ("no data yet")
+                                       // or 0 ("=ref") here, may
+                                       // change to 1 ("hgvs variant
+                                       // present") below, either on
+                                       // this line or a future line.
+                                       hgvsColPair = [2][]int16{make([]int16, len(cgnames)), make([]int16, len(cgnames))}
+                                       rt, ok := reftile[tagID(tag)]
+                                       if !ok {
+                                               err = fmt.Errorf("bug: seeing annotations for tag %d, but it has no reftile entry", tag)
+                                               return 1
+                                       }
+                                       for ph := 0; ph < 2; ph++ {
+                                               for row := 0; row < rows; row++ {
+                                                       v := chunk[row*chunkcols+incol*2+ph]
+                                                       if tileVariantID(v) == rt.variant {
+                                                               hgvsColPair[ph][row] = 0
+                                                       } else {
+                                                               hgvsColPair[ph][row] = -1
+                                                       }
+                                               }
+                                       }
+                                       hgvsCols[hgvsID] = hgvsColPair
+                                       if annow != nil {
+                                               hgvsref := hgvs.Variant{
+                                                       Position: pos,
+                                                       Ref:      string(refseq),
+                                                       New:      string(refseq),
+                                               }
+                                               fmt.Fprintf(annow, "%d,%d,%d,%s:g.%s,%s,%d,%s,%s,%s\n", tag, incol+startcol/2, rt.variant, seqname, hgvsref.String(), seqname, pos, refseq, refseq, fields[8])
+                                       }
+                               }
+                               if annow != nil {
+                                       fmt.Fprintf(annow, "%d,%d,%d,%s,%s,%d,%s,%s,%s\n", tag, incol+startcol/2, tileVariant, hgvsID, seqname, pos, refseq, fields[7], fields[8])
+                               }
+                               for ph := 0; ph < 2; ph++ {
+                                       for row := 0; row < rows; row++ {
+                                               v := chunk[row*chunkcols+incol*2+ph]
+                                               if int(v) == tileVariant {
+                                                       hgvsColPair[ph][row] = 1
+                                               }
+                                       }
+                               }
+                       }
+
+                       startcol += chunkcols
+               }
+               if *mergeOutput {
+                       err = annow.Flush()
+                       if err != nil {
+                               return 1
+                       }
+                       err = annof.Close()
+                       if err != nil {
+                               return 1
+                       }
+                       err = writeNumpyInt16(fmt.Sprintf("%s/matrix.npy", *outputDir), out, rows, cols)
+                       if err != nil {
+                               return 1
+                       }
+               }
+               out = nil
+
+               if *hgvsSingle {
+                       cols = len(hgvsCols) * 2
+                       log.Printf("building hgvs-based matrix: %d rows x %d cols", rows, cols)
+                       out = make([]int16, rows*cols)
+                       hgvsIDs := make([]string, 0, cols/2)
+                       for hgvsID := range hgvsCols {
+                               hgvsIDs = append(hgvsIDs, hgvsID)
+                       }
+                       sort.Strings(hgvsIDs)
+                       var hgvsLabels bytes.Buffer
+                       for idx, hgvsID := range hgvsIDs {
+                               fmt.Fprintf(&hgvsLabels, "%d,%s\n", idx, hgvsID)
+                               for ph := 0; ph < 2; ph++ {
+                                       hgvscol := hgvsCols[hgvsID][ph]
+                                       for row, val := range hgvscol {
+                                               out[row*cols+idx*2+ph] = val
+                                       }
+                               }
+                       }
+                       err = writeNumpyInt16(fmt.Sprintf("%s/hgvs.npy", *outputDir), out, rows, cols)
+                       if err != nil {
+                               return 1
+                       }
+
+                       fnm := fmt.Sprintf("%s/hgvs.annotations.csv", *outputDir)
+                       log.Printf("writing hgvs labels: %s", fnm)
+                       err = ioutil.WriteFile(fnm, hgvsLabels.Bytes(), 0777)
+                       if err != nil {
+                               return 1
+                       }
+               }
+       }
        return 0
 }
+
+func writeNumpyInt16(fnm string, out []int16, rows, cols int) error {
+       output, err := os.Create(fnm)
+       if err != nil {
+               return err
+       }
+       defer output.Close()
+       bufw := bufio.NewWriterSize(output, 1<<26)
+       npw, err := gonpy.NewWriter(nopCloser{bufw})
+       if err != nil {
+               return err
+       }
+       log.WithFields(log.Fields{
+               "filename": fnm,
+               "rows":     rows,
+               "cols":     cols,
+       }).Infof("writing numpy: %s", fnm)
+       npw.Shape = []int{rows, cols}
+       npw.WriteInt16(out)
+       err = bufw.Flush()
+       if err != nil {
+               return err
+       }
+       return output.Close()
+}
+
+func writeNumpyInt8(fnm string, out []int8, rows, cols int) error {
+       output, err := os.Create(fnm)
+       if err != nil {
+               return err
+       }
+       defer output.Close()
+       bufw := bufio.NewWriterSize(output, 1<<26)
+       npw, err := gonpy.NewWriter(nopCloser{bufw})
+       if err != nil {
+               return err
+       }
+       log.WithFields(log.Fields{
+               "filename": fnm,
+               "rows":     rows,
+               "cols":     cols,
+       }).Infof("writing numpy: %s", fnm)
+       npw.Shape = []int{rows, cols}
+       npw.WriteInt8(out)
+       err = bufw.Flush()
+       if err != nil {
+               return err
+       }
+       return output.Close()
+}