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mag.c
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mag.c
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/* remaining problems:
1. multiedges due to tandem repeats
*/
#include <math.h>
#include <zlib.h>
#include <stdio.h>
#include <assert.h>
#include "mag.h"
#include "kvec.h"
#include "internal.h"
#include "kseq.h"
KSEQ_DECLARE(gzFile)
#include "khash.h"
KHASH_INIT2(64,, khint64_t, uint64_t, 1, kh_int64_hash_func, kh_int64_hash_equal)
typedef khash_t(64) hash64_t;
#define ku128_xlt(a, b) ((a).x < (b).x || ((a).x == (b).x && (a).y > (b).y))
#define ku128_ylt(a, b) ((int64_t)(a).y > (int64_t)(b).y)
#include "ksort.h"
KSORT_INIT(128x, ku128_t, ku128_xlt)
KSORT_INIT(128y, ku128_t, ku128_ylt)
KSORT_INIT_GENERIC(uint64_t)
#define edge_mark_del(_x) ((_x).x = (uint64_t)-2, (_x).y = 0)
#define edge_is_del(_x) ((_x).x == (uint64_t)-2 || (_x).y == 0)
static int fm_verbose = 1;
/*********************
* Vector operations *
*********************/
static inline void v128_clean(ku128_v *r)
{
int i, j;
for (i = j = 0; i < r->n; ++i)
if (!edge_is_del(r->a[i])) { // keep this arc
if (j != i) r->a[j++] = r->a[i];
else ++j;
}
r->n = j;
}
void mag_v128_clean(ku128_v *r)
{
v128_clean(r);
}
static inline void v128_rmdup(ku128_v *r)
{
int l, cnt;
uint64_t x;
if (r->n > 1) ks_introsort(128x, r->n, r->a);
for (l = cnt = 0; l < r->n; ++l) // jump to the first node to be retained
if (edge_is_del(r->a[l])) ++cnt;
else break;
if (l == r->n) { // no good arcs
r->n = 0;
return;
}
x = r->a[l].x;
for (++l; l < r->n; ++l) { // mark duplicated node
if (edge_is_del(r->a[l]) || r->a[l].x == x)
edge_mark_del(r->a[l]), ++cnt;
else x = r->a[l].x;
}
if (cnt) v128_clean(r);
}
static inline void v128_cap(ku128_v *r, int max)
{
int i, thres;
if (r->n <= max) return;
ks_introsort(128y, r->n, r->a);
thres = r->a[max].y;
for (i = 0; i < r->n; ++i)
if (r->a[i].y == thres) break;
r->n = i;
}
/*************************************************
* Mapping between vertex id and interval end id *
*************************************************/
void mag_g_build_hash(mag_t *g)
{
long i;
int j, ret;
hash64_t *h;
h = kh_init(64);
for (i = 0; i < g->v.n; ++i) {
const magv_t *p = &g->v.a[i];
for (j = 0; j < 2; ++j) {
khint_t k = kh_put(64, h, p->k[j], &ret);
if (ret == 0) {
if (fm_verbose >= 2)
fprintf(stderr, "[W::%s] terminal %ld is duplicated.\n", __func__, (long)p->k[j]);
kh_val(h, k) = (uint64_t)-1;
} else kh_val(h, k) = i<<1|j;
}
}
g->h = h;
}
static inline uint64_t tid2idd(hash64_t *h, uint64_t tid)
{
khint_t k = kh_get(64, h, tid);
assert(k != kh_end(h));
return kh_val(h, k);
}
uint64_t mag_tid2idd(void *h, uint64_t tid) // exported version
{
return tid2idd(h, tid);
}
void mag_g_amend(mag_t *g)
{
int i, j, l, ll;
for (i = 0; i < g->v.n; ++i) {
magv_t *p = &g->v.a[i];
ku128_v *r;
for (j = 0; j < 2; ++j) {
for (l = 0; l < p->nei[j].n; ++l) {
khint_t k;
uint64_t z, x = p->nei[j].a[l].x;
k = kh_get(64, g->h, x);
if (k == kh_end((hash64_t*)g->h)) { // neighbor is not in the hash table; likely due to tip removal
edge_mark_del(p->nei[j].a[l]);
continue;
} else z = kh_val((hash64_t*)g->h, k);
r = &g->v.a[z>>1].nei[z&1];
for (ll = 0, z = p->k[j]; ll < r->n; ++ll)
if (r->a[ll].x == z) break;
if (ll == r->n) // not in neighbor's neighor
edge_mark_del(p->nei[j].a[l]);
}
v128_rmdup(&p->nei[j]);
}
}
}
/*********************************
* Graph I/O initialization etc. *
*********************************/
void mag_v_write(const magv_t *p, kstring_t *out)
{
int j, k;
if (p->len <= 0) return;
out->l = 0;
kputc('@', out); kputl(p->k[0], out); kputc(':', out); kputl(p->k[1], out);
kputc('\t', out); kputw(p->nsr, out);
for (j = 0; j < 2; ++j) {
const ku128_v *r = &p->nei[j];
kputc('\t', out);
for (k = 0; k < r->n; ++k) {
if (edge_is_del(r->a[k])) continue;
kputl(r->a[k].x, out); kputc(',', out); kputw((int32_t)r->a[k].y, out);
kputc(';', out);
}
if (p->nei[j].n == 0) kputc('.', out);
}
kputc('\n', out);
ks_resize(out, out->l + 2 * p->len + 5);
for (j = 0; j < p->len; ++j)
out->s[out->l++] = "ACGT"[(int)p->seq[j] - 1];
out->s[out->l] = 0;
kputsn("\n+\n", 3, out);
kputsn(p->cov, p->len, out);
kputc('\n', out);
}
void mag_g_print(const mag_t *g)
{
int i;
kstring_t out;
out.l = out.m = 0; out.s = 0;
for (i = 0; i < g->v.n; ++i) {
if (g->v.a[i].len < 0) continue;
mag_v_write(&g->v.a[i], &out);
fwrite(out.s, 1, out.l, stdout);
}
free(out.s);
fflush(stdout);
}
/**************************
* Basic graph operations *
**************************/
void mag_v_destroy(magv_t *v)
{
free(v->nei[0].a); free(v->nei[1].a);
free(v->seq); free(v->cov);
memset(v, 0, sizeof(magv_t));
v->len = -1;
}
void mag_g_destroy(mag_t *g)
{
int i;
kh_destroy(64, g->h);
for (i = 0; i < g->v.n; ++i)
mag_v_destroy(&g->v.a[i]);
free(g->v.a);
free(g);
}
void mag_v_copy_to_empty(magv_t *dst, const magv_t *src) // NB: memory leak if dst is allocated
{
memcpy(dst, src, sizeof(magv_t));
dst->max_len = dst->len + 1;
kroundup32(dst->max_len);
dst->seq = calloc(dst->max_len, 1); memcpy(dst->seq, src->seq, src->len);
dst->cov = calloc(dst->max_len, 1); memcpy(dst->cov, src->cov, src->len);
kv_init(dst->nei[0]); kv_copy(ku128_t, dst->nei[0], src->nei[0]);
kv_init(dst->nei[1]); kv_copy(ku128_t, dst->nei[1], src->nei[1]);
}
void mag_eh_add(mag_t *g, uint64_t u, uint64_t v, int ovlp) // add v to u
{
ku128_v *r;
ku128_t *q;
uint64_t idd;
int i;
if ((int64_t)u < 0) return;
idd = tid2idd(g->h, u);
r = &g->v.a[idd>>1].nei[idd&1];
for (i = 0; i < r->n; ++i) // no multi-edges
if (r->a[i].x == v) return;
kv_pushp(ku128_t, *r, &q);
q->x = v; q->y = ovlp;
}
void mag_eh_markdel(mag_t *g, uint64_t u, uint64_t v) // mark deletion of v from u
{
int i;
uint64_t idd;
if ((int64_t)u < 0) return;
idd = tid2idd(g->h, u);
ku128_v *r = &g->v.a[idd>>1].nei[idd&1];
for (i = 0; i < r->n; ++i)
if (r->a[i].x == v) edge_mark_del(r->a[i]);
}
void mag_v_del(mag_t *g, magv_t *p)
{
int i, j;
khint_t k;
if (p->len < 0) return;
for (i = 0; i < 2; ++i) {
ku128_v *r = &p->nei[i];
for (j = 0; j < r->n; ++j)
if (!edge_is_del(r->a[j]) && r->a[j].x != p->k[0] && r->a[j].x != p->k[1])
mag_eh_markdel(g, r->a[j].x, p->k[i]);
}
for (i = 0; i < 2; ++i) {
k = kh_get(64, g->h, p->k[i]);
kh_del(64, g->h, k);
}
mag_v_destroy(p);
}
void mag_v_transdel(mag_t *g, magv_t *p, int min_ovlp)
{
if (p->nei[0].n && p->nei[1].n) {
int i, j, ovlp;
for (i = 0; i < p->nei[0].n; ++i) {
if (edge_is_del(p->nei[0].a[i]) || p->nei[0].a[i].x == p->k[0] || p->nei[0].a[i].x == p->k[1]) continue; // due to p->p loop
for (j = 0; j < p->nei[1].n; ++j) {
if (edge_is_del(p->nei[1].a[j]) || p->nei[1].a[j].x == p->k[0] || p->nei[1].a[j].x == p->k[1]) continue;
ovlp = (int)(p->nei[0].a[i].y + p->nei[1].a[j].y) - p->len;
if (ovlp >= min_ovlp) {
mag_eh_add(g, p->nei[0].a[i].x, p->nei[1].a[j].x, ovlp);
mag_eh_add(g, p->nei[1].a[j].x, p->nei[0].a[i].x, ovlp);
}
}
}
}
mag_v_del(g, p);
}
void mag_v_flip(mag_t *g, magv_t *p)
{
ku128_v t;
khint_t k;
hash64_t *h = (hash64_t*)g->h;
seq_revcomp6(p->len, (uint8_t*)p->seq);
seq_reverse(p->len, (uint8_t*)p->cov);
p->k[0] ^= p->k[1]; p->k[1] ^= p->k[0]; p->k[0] ^= p->k[1];
t = p->nei[0]; p->nei[0] = p->nei[1]; p->nei[1] = t;
k = kh_get(64, h, p->k[0]);
assert(k != kh_end(h));
kh_val(h, k) ^= 1;
k = kh_get(64, h, p->k[1]);
assert(k != kh_end(h));
kh_val(h, k) ^= 1;
}
/*********************
* Unambiguous merge *
*********************/
int mag_vh_merge_try(mag_t *g, magv_t *p, int min_merge_len) // merge p's neighbor to the right-end of p
{
magv_t *q;
khint_t kp, kq;
int i, j, new_l;
hash64_t *h = (hash64_t*)g->h;
// check if an unambiguous merge can be performed
if (p->nei[1].n != 1) return -1; // multiple or no neighbor; do not merge
if ((int64_t)p->nei[1].a[0].x < 0) return -2; // deleted neighbor
if ((int)p->nei[1].a[0].y < min_merge_len) return -5;
kq = kh_get(64, g->h, p->nei[1].a[0].x);
assert(kq != kh_end(h)); // otherwise the neighbor is non-existant
q = &g->v.a[kh_val((hash64_t*)g->h, kq)>>1];
if (p == q) return -3; // we have a loop p->p. We cannot merge in this case
if (q->nei[kh_val(h, kq)&1].n != 1) return -4; // the neighbor q has multiple neighbors. cannot be an unambiguous merge
// we can perform a merge; do further consistency check (mostly check bugs)
if (kh_val(h, kq)&1) mag_v_flip(g, q); // a "><" bidirectional arc; flip q
kp = kh_get(64, g->h, p->k[1]); assert(kp != kh_end(h)); // get the iterator to p
kh_del(64, g->h, kp); kh_del(64, g->h, kq); // remove the two ends of the arc in the hash table
assert(p->k[1] == q->nei[0].a[0].x && q->k[0] == p->nei[1].a[0].x); // otherwise inconsistent topology
assert(p->nei[1].a[0].y == q->nei[0].a[0].y); // the overlap length must be the same
assert(p->len >= p->nei[1].a[0].y && q->len >= p->nei[1].a[0].y); // and the overlap is shorter than both vertices
// update the read count and sequence length
p->nsr += q->nsr;
new_l = p->len + q->len - p->nei[1].a[0].y;
if (new_l + 1 > p->max_len) { // then double p->seq and p->cov
p->max_len = new_l + 1;
kroundup32(p->max_len);
p->seq = realloc(p->seq, p->max_len);
p->cov = realloc(p->cov, p->max_len);
}
// merge seq and cov
for (i = p->len - p->nei[1].a[0].y, j = 0; j < q->len; ++i, ++j) { // write seq and cov
p->seq[i] = q->seq[j];
if (i < p->len) {
if ((int)p->cov[i] + (q->cov[j] - 33) > 126) p->cov[i] = 126;
else p->cov[i] += q->cov[j] - 33;
} else p->cov[i] = q->cov[j];
}
p->seq[new_l] = p->cov[new_l] = 0;
p->len = new_l;
// merge neighbors
free(p->nei[1].a);
p->nei[1] = q->nei[1]; p->k[1] = q->k[1];
q->nei[1].a = 0; // to avoid freeing p->nei[1] by mag_v_destroy() below
// update the hash table for the right end of p
kp = kh_get(64, g->h, p->k[1]);
assert(kp != kh_end((hash64_t*)g->h));
kh_val(h, kp) = (p - g->v.a)<<1 | 1;
// clean up q
mag_v_destroy(q);
return 0;
}
void mag_g_merge(mag_t *g, int rmdup, int min_merge_len)
{
int i;
uint64_t n = 0;
for (i = 0; i < g->v.n; ++i) { // remove multiedges; FIXME: should we do that?
if (rmdup) {
v128_rmdup(&g->v.a[i].nei[0]);
v128_rmdup(&g->v.a[i].nei[1]);
} else {
v128_clean(&g->v.a[i].nei[0]);
v128_clean(&g->v.a[i].nei[1]);
}
}
for (i = 0; i < g->v.n; ++i) {
magv_t *p = &g->v.a[i];
if (p->len < 0) continue;
while (mag_vh_merge_try(g, p, min_merge_len) == 0) ++n;
mag_v_flip(g, p);
while (mag_vh_merge_try(g, p, min_merge_len) == 0) ++n;
}
if (fm_verbose >= 3)
fprintf(stderr, "[M::%s] unambiguously merged %ld pairs of vertices\n", __func__, (long)n);
}
/*****************************
* Easy graph simplification *
*****************************/
typedef magv_t *magv_p;
#define mag_vlt1(a, b) ((a)->nsr < (b)->nsr || ((a)->nsr == (b)->nsr && (a)->len < (b)->len))
KSORT_INIT(vlt1, magv_p, mag_vlt1)
#define mag_vlt2(a, b) ((a)->nei[0].n + (a)->nei[1].n < (b)->nei[0].n + (b)->nei[1].n)
KSORT_INIT(vlt2, magv_p, mag_vlt2)
int mag_g_rm_vext(mag_t *g, int min_len, int min_nsr)
{
int i;
kvec_t(magv_p) a = {0,0,0};
for (i = 0; i < g->v.n; ++i) {
magv_t *p = &g->v.a[i];
if (p->len < 0 || (p->nei[0].n > 0 && p->nei[1].n > 0)) continue;
if (p->len >= min_len || p->nsr >= min_nsr) continue;
kv_push(magv_p, a, p);
}
ks_introsort(vlt1, a.n, a.a);
for (i = 0; i < a.n; ++i) mag_v_del(g, a.a[i]);
free(a.a);
if (fm_verbose >= 3)
fprintf(stderr, "[M::%s] removed %ld tips (min_len=%d, min_nsr=%d)\n", __func__, a.n, min_len, min_nsr);
return a.n;
}
int mag_g_rm_vint(mag_t *g, int min_len, int min_nsr, int min_ovlp)
{
int i;
kvec_t(magv_p) a = {0,0,0};
for (i = 0; i < g->v.n; ++i) {
magv_t *p = &g->v.a[i];
if (p->len >= 0 && p->len < min_len && p->nsr < min_nsr)
kv_push(magv_p, a, p);
}
ks_introsort(vlt1, a.n, a.a);
for (i = 0; i < a.n; ++i) mag_v_transdel(g, a.a[i], min_ovlp);
free(a.a);
if (fm_verbose >= 3)
fprintf(stderr, "[M::%s] removed %ld internal vertices (min_len=%d, min_nsr=%d)\n", __func__, a.n, min_len, min_nsr);
return a.n;
}
void mag_g_rm_edge(mag_t *g, int min_ovlp, double min_ratio, int min_len, int min_nsr)
{
int i, j, k;
kvec_t(magv_p) a = {0,0,0};
uint64_t n_marked = 0;
for (i = 0; i < g->v.n; ++i) {
magv_t *p = &g->v.a[i];
if (p->len < 0) continue;
if ((p->nei[0].n == 0 || p->nei[1].n == 0) && p->len < min_len && p->nsr < min_nsr)
continue; // skip tips
kv_push(magv_p, a, p);
}
ks_introsort(vlt1, a.n, a.a);
for (i = a.n - 1; i >= 0; --i) {
magv_t *p = a.a[i];
for (j = 0; j < 2; ++j) {
ku128_v *r = &p->nei[j];
int max_ovlp = min_ovlp, max_k = -1;
if (r->n == 0) continue; // no overlapping reads
for (k = 0; k < r->n; ++k) // get the max overlap length
if (max_ovlp < r->a[k].y)
max_ovlp = r->a[k].y, max_k = k;
if (max_k >= 0) { // test if max_k is a tip
uint64_t x = tid2idd(g->h, r->a[max_k].x);
magv_t *q = &g->v.a[x>>1];
if (q->len >= 0 && (q->nei[0].n == 0 || q->nei[1].n == 0) && q->len < min_len && q->nsr < min_nsr)
max_ovlp = min_ovlp;
}
for (k = 0; k < r->n; ++k) {
if (edge_is_del(r->a[k])) continue;
if (r->a[k].y < min_ovlp || (double)r->a[k].y / max_ovlp < min_ratio) {
mag_eh_markdel(g, r->a[k].x, p->k[j]); // FIXME: should we check if r->a[k] is p itself?
edge_mark_del(r->a[k]);
++n_marked;
}
}
}
}
free(a.a);
if (fm_verbose >= 3)
fprintf(stderr, "[M::%s] removed %ld edges\n", __func__, (long)n_marked);
}
/*********************************************
* A-statistics and simplistic flow analysis *
*********************************************/
#define A_THRES 20.
#define A_MIN_SUPP 5
double mag_cal_rdist(mag_t *g)
{
magv_v *v = &g->v;
int j;
uint64_t *srt;
double rdist = -1.;
int64_t i, sum_n_all, sum_n, sum_l;
srt = calloc(v->n, 8);
for (i = 0, sum_n_all = 0; i < v->n; ++i) {
srt[i] = (uint64_t)v->a[i].nsr<<32 | i;
sum_n_all += v->a[i].nsr;
}
ks_introsort_uint64_t(v->n, srt);
for (j = 0; j < 2; ++j) {
sum_n = sum_l = 0;
for (i = v->n - 1; i >= 0; --i) {
const magv_t *p = &v->a[srt[i]<<32>>32];
int tmp1, tmp2;
tmp1 = tmp2 = 0;
if (p->nei[0].n) ++tmp1, tmp2 += p->nei[0].a[0].y;
if (p->nei[1].n) ++tmp1, tmp2 += p->nei[1].a[0].y;
if (tmp1) tmp2 /= tmp1;
if (rdist > 0.) {
double A = (p->len - tmp1) / rdist - p->nsr * M_LN2;
if (A < A_THRES) continue;
}
sum_n += p->nsr;
sum_l += p->len - tmp1;
if (sum_n >= sum_n_all * 0.5) break;
}
rdist = (double)sum_l / sum_n;
}
if (fm_verbose >= 3) {
fprintf(stderr, "[M::%s] average read distance %.3f.\n", __func__, rdist);
fprintf(stderr, "[M::%s] approximate genome size: %.0f (inaccurate!)\n", __func__, rdist * sum_n_all);
}
free(srt);
return rdist;
}
/**************
* Key portal *
**************/
void mag_init_opt(magopt_t *o)
{
memset(o, 0, sizeof(magopt_t));
o->trim_len = 0;
o->trim_depth = 6;
o->min_elen = 300;
o->min_ovlp = 0;
o->min_merge_len = 0;
o->min_ensr = 4;
o->min_insr = 3;
o->min_dratio1 = 0.7;
o->max_bcov = 10.;
o->max_bfrac = 0.15;
o->max_bvtx = 64;
o->max_bdist = 512;
}
void mag_g_clean(mag_t *g, const magopt_t *opt)
{
int j;
if (g->min_ovlp < opt->min_ovlp) g->min_ovlp = opt->min_ovlp;
for (j = 2; j <= opt->min_ensr; ++j)
mag_g_rm_vext(g, opt->min_elen, j);
mag_g_merge(g, 0, opt->min_merge_len);
mag_g_rm_edge(g, g->min_ovlp, opt->min_dratio1, opt->min_elen, opt->min_ensr);
mag_g_merge(g, 1, opt->min_merge_len);
for (j = 2; j <= opt->min_ensr; ++j)
mag_g_rm_vext(g, opt->min_elen, j);
mag_g_merge(g, 0, opt->min_merge_len);
if (opt->flag & MAG_F_AGGRESSIVE) mag_g_pop_open(g, opt->min_elen);
if (!(opt->flag & MAG_F_NO_SIMPL)) mag_g_simplify_bubble(g, opt->max_bvtx, opt->max_bdist);
mag_g_pop_simple(g, opt->max_bcov, opt->max_bfrac, opt->min_merge_len, opt->flag & MAG_F_AGGRESSIVE);
mag_g_rm_vint(g, opt->min_elen, opt->min_insr, g->min_ovlp);
mag_g_rm_edge(g, g->min_ovlp, opt->min_dratio1, opt->min_elen, opt->min_ensr);
mag_g_merge(g, 1, opt->min_merge_len);
mag_g_rm_vext(g, opt->min_elen, opt->min_ensr);
mag_g_merge(g, 0, opt->min_merge_len);
if (opt->flag & MAG_F_AGGRESSIVE) mag_g_pop_open(g, opt->min_elen);
mag_g_rm_vext(g, opt->min_elen, opt->min_ensr);
mag_g_merge(g, 0, opt->min_merge_len);
}
void mag_v_trim_open(mag_t *g, magv_t *v, int trim_len, int trim_depth)
{
int i, j, tl[2];
if (v->nei[0].n > 0 && v->nei[1].n > 0) return; // no open end; do nothing
if (v->nei[0].n == 0 && v->nei[1].n == 0 && v->len < trim_len * 3) { // disconnected short vertex
mag_v_del(g, v);
return;
}
for (j = 0; j < 2; ++j) {
ku128_v *r = &v->nei[!j];
int max_ovlp = 0;
for (i = 0; i < r->n; ++i)
max_ovlp = max_ovlp > r->a[i].y? max_ovlp : r->a[i].y;
tl[j] = v->len - max_ovlp < trim_len? v->len - max_ovlp : trim_len;
}
if (v->nei[0].n == 0) {
for (i = 0; i < tl[0] && v->cov[i] - 33 < trim_depth; ++i);
tl[0] = i;
v->len -= i;
memmove(v->seq, v->seq + tl[0], v->len);
memmove(v->cov, v->cov + tl[0], v->len);
}
if (v->nei[1].n == 0) {
for (i = v->len - 1; i >= v->len - tl[1] && v->cov[i] - 33 < trim_depth; --i);
tl[1] = v->len - 1 - i;
v->len -= tl[1];
}
}
void mag_g_trim_open(mag_t *g, const magopt_t *opt)
{
int i;
if (opt->trim_len == 0) return;
for (i = 0; i < g->v.n; ++i)
mag_v_trim_open(g, &g->v.a[i], opt->trim_len, opt->trim_depth);
}