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#!/usr/bin/env python3
import argparse
import json
import traceback
from pathlib import Path
import mdtraj as md
import numpy as np
import pandas as pd
from tqdm import tqdm
from sklearn.decomposition import PCA
def find_entries(atlas_root, entry="all", max_entries=None):
atlas_root = Path(atlas_root)
if entry != "all":
return [entry]
entries = []
for d in sorted(atlas_root.iterdir()):
if not d.is_dir():
continue
name = d.name
pdb = d / f"{name}.pdb"
xtcs = sorted(d.glob(f"{name}_R*.xtc"))
if pdb.exists() and len(xtcs) > 0:
entries.append(name)
if max_entries is not None:
entries = entries[:max_entries]
return entries
def load_entry(entry_dir, entry):
entry_dir = Path(entry_dir)
pdb = entry_dir / f"{entry}.pdb"
xtcs = sorted(entry_dir.glob(f"{entry}_R*.xtc"))
if not pdb.exists():
raise FileNotFoundError(f"Missing PDB: {pdb}")
if len(xtcs) == 0:
raise FileNotFoundError(f"Missing XTC files: {entry_dir}")
coords_list = []
rep_ids_list = []
frame_ids_list = []
traj_lengths = []
rep_names = []
n_ca_ref = None
for rep_id, xtc in enumerate(xtcs):
traj = md.load(str(xtc), top=str(pdb))
ca_idx = traj.topology.select("name CA")
if len(ca_idx) == 0:
raise RuntimeError(f"No CA atoms found: {entry}")
if n_ca_ref is None:
n_ca_ref = len(ca_idx)
elif len(ca_idx) != n_ca_ref:
raise RuntimeError(f"CA number mismatch: {entry}")
traj_ca = traj.atom_slice(ca_idx)
# mdtraj: nm -> Å
xyz_A = traj_ca.xyz.astype(np.float32) * 10.0
n_frames = xyz_A.shape[0]
coords_list.append(xyz_A)
rep_ids_list.append(np.full(n_frames, rep_id, dtype=np.int32))
frame_ids_list.append(np.arange(n_frames, dtype=np.int32))
traj_lengths.append(n_frames)
rep_names.append(xtc.stem.replace(f"{entry}_", ""))
coords_A = np.concatenate(coords_list, axis=0)
rep_ids = np.concatenate(rep_ids_list, axis=0)
frame_ids = np.concatenate(frame_ids_list, axis=0)
return coords_A, rep_ids, frame_ids, traj_lengths, rep_names, [x.name for x in xtcs]
def select_ca_distance_pairs(ref_ca_A, cutoff_A=12.0, min_seq_sep=3, max_pairs=20000):
n_ca = ref_ca_A.shape[0]
ii, jj = np.triu_indices(n_ca, k=min_seq_sep)
diff = ref_ca_A[ii] - ref_ca_A[jj]
dist = np.sqrt(np.sum(diff * diff, axis=1))
mask = dist <= cutoff_A
pairs = np.stack([ii[mask], jj[mask]], axis=1)
pair_dist = dist[mask]
if len(pairs) == 0:
pairs = np.stack([ii, jj], axis=1)
pair_dist = dist
if len(pairs) > max_pairs:
order = np.argsort(pair_dist)
keep = order[:max_pairs]
pairs = pairs[keep]
return pairs.astype(np.int32)
def compute_distance_features(coords_A, ca_pairs, chunk_size=256):
n_frames = coords_A.shape[0]
feats = []
for s in range(0, n_frames, chunk_size):
e = min(s + chunk_size, n_frames)
c = coords_A[s:e]
diff = c[:, ca_pairs[:, 0], :] - c[:, ca_pairs[:, 1], :]
dist = np.sqrt(np.sum(diff * diff, axis=-1))
feats.append(dist.astype(np.float32))
return np.concatenate(feats, axis=0)
def fit_tica(Y, traj_lengths, lag=10, tica_dim=3, eps=1e-6):
d = Y.shape[1]
C0 = np.zeros((d, d), dtype=np.float64)
Ct = np.zeros((d, d), dtype=np.float64)
count = 0
start = 0
for L in traj_lengths:
Yi = Y[start:start + L].astype(np.float64)
start += L
if L <= lag:
continue
Y0 = Yi[:-lag]
Yt = Yi[lag:]
C0 += Y0.T @ Y0
C0 += Yt.T @ Yt
Ct += Y0.T @ Yt
Ct += Yt.T @ Y0
count += 2 * Y0.shape[0]
if count == 0:
raise RuntimeError("No valid trajectory length for TICA. Try smaller lag.")
C0 /= count
Ct /= count
C0 = 0.5 * (C0 + C0.T)
Ct = 0.5 * (Ct + Ct.T)
C0 += eps * np.eye(d)
evals0, evecs0 = np.linalg.eigh(C0)
keep = evals0 > eps
if keep.sum() == 0:
raise RuntimeError("Degenerate C0 in TICA.")
U0 = evecs0[:, keep]
S0 = evals0[keep]
W = U0 @ np.diag(1.0 / np.sqrt(S0))
M = W.T @ Ct @ W
M = 0.5 * (M + M.T)
evals, evecs = np.linalg.eigh(M)
order = np.argsort(evals)[::-1]
dim = min(tica_dim, len(order))
V = W @ evecs[:, order[:dim]]
q = Y @ V
q = q.astype(np.float32)
q_mean = q.mean(axis=0, keepdims=True)
q_std = q.std(axis=0, keepdims=True) + 1e-6
q = (q - q_mean) / q_std
return q.astype(np.float32), evals[order[:dim]].astype(np.float32)
def build_affinity_topk(q, sigma_k=30, top_k=64):
q = q.astype(np.float32)
n = q.shape[0]
q2 = np.sum(q * q, axis=1, keepdims=True)
D2 = q2 + q2.T - 2.0 * (q @ q.T)
D2 = np.maximum(D2, 0.0).astype(np.float32)
np.fill_diagonal(D2, np.inf)
D = np.sqrt(D2)
kth = min(max(1, sigma_k), n - 1)
sigma = np.partition(D, kth - 1, axis=1)[:, kth - 1]
sigma = np.maximum(sigma, 1e-6).astype(np.float32)
denom = sigma[:, None] * sigma[None, :] + 1e-6
A = np.exp(-D2 / denom).astype(np.float32)
np.fill_diagonal(A, 0.0)
top_k = min(top_k, n - 1)
top_idx = np.argpartition(-A, top_k, axis=1)[:, :top_k]
top_w = np.take_along_axis(A, top_idx, axis=1)
order = np.argsort(-top_w, axis=1)
top_idx = np.take_along_axis(top_idx, order, axis=1)
top_w = np.take_along_axis(top_w, order, axis=1)
return A, top_idx.astype(np.int32), top_w.astype(np.float32)
def batch_kabsch_rmsd(coords_A, ii, jj, chunk_size=512):
rmsds = []
for s in range(0, len(ii), chunk_size):
e = min(s + chunk_size, len(ii))
P = coords_A[ii[s:e]].astype(np.float64)
Q = coords_A[jj[s:e]].astype(np.float64)
P = P - P.mean(axis=1, keepdims=True)
Q = Q - Q.mean(axis=1, keepdims=True)
C = np.einsum("bni,bnj->bij", P, Q)
U, S, Vt = np.linalg.svd(C)
det = np.linalg.det(U @ Vt)
D = np.zeros_like(C)
D[:, 0, 0] = 1.0
D[:, 1, 1] = 1.0
D[:, 2, 2] = np.sign(det)
R = U @ D @ Vt
P_rot = np.einsum("bni,bij->bnj", P, R)
diff = P_rot - Q
rmsd = np.sqrt(np.mean(np.sum(diff * diff, axis=-1), axis=1))
rmsds.append(rmsd.astype(np.float32))
return np.concatenate(rmsds, axis=0)
def batch_contact_diff(X_dist, ii, jj, chunk_size=256):
vals = []
for s in range(0, len(ii), chunk_size):
e = min(s + chunk_size, len(ii))
diff = np.abs(X_dist[ii[s:e]] - X_dist[jj[s:e]])
vals.append(diff.mean(axis=1).astype(np.float32))
return np.concatenate(vals, axis=0)
def choose_pairs(iu, ju, scores, kind, n_sample):
n = len(scores)
if n == 0:
return np.array([], dtype=np.int64), np.array([], dtype=np.int64)
k = min(n_sample, n)
if kind == "high":
idx = np.argpartition(-scores, k - 1)[:k]
idx = idx[np.argsort(-scores[idx])]
elif kind == "low":
idx = np.argpartition(scores, k - 1)[:k]
idx = idx[np.argsort(scores[idx])]
elif kind == "mid":
med = np.median(scores)
d = np.abs(scores - med)
idx = np.argpartition(d, k - 1)[:k]
idx = idx[np.argsort(d[idx])]
else:
raise ValueError(kind)
return iu[idx], ju[idx]
def evaluate_entry(entry, A, coords_A, X_dist, rep_ids, frame_ids, n_sample=3000):
n = A.shape[0]
iu, ju = np.triu_indices(n, k=1)
rows = []
for mode in ["all", "cross", "same"]:
if mode == "all":
mask = np.ones(len(iu), dtype=bool)
elif mode == "cross":
mask = rep_ids[iu] != rep_ids[ju]
elif mode == "same":
mask = rep_ids[iu] == rep_ids[ju]
else:
raise ValueError(mode)
mi = iu[mask]
mj = ju[mask]
scores = A[mi, mj]
for kind in ["high", "mid", "low"]:
ii, jj = choose_pairs(mi, mj, scores, kind, n_sample)
if len(ii) == 0:
rows.append({
"entry": entry,
"group": f"{mode}_{kind}",
"n_pairs": 0,
"rmsd_A_mean": np.nan,
"rmsd_A_std": np.nan,
"contact_diff_A_mean": np.nan,
"contact_diff_A_std": np.nan,
"same_rep_frac": np.nan,
"time_gap_mean_same_rep": np.nan,
"near_time_frac_gap_le_5": np.nan,
"near_time_frac_gap_le_20": np.nan,
})
continue
rmsd = batch_kabsch_rmsd(coords_A, ii, jj)
contact_diff = batch_contact_diff(X_dist, ii, jj)
same_rep = rep_ids[ii] == rep_ids[jj]
same_rep_frac = float(np.mean(same_rep))
if same_rep.any():
gaps = np.abs(frame_ids[ii[same_rep]] - frame_ids[jj[same_rep]])
time_gap_mean = float(np.mean(gaps))
near_5 = float(np.mean(gaps <= 5))
near_20 = float(np.mean(gaps <= 20))
else:
time_gap_mean = np.nan
near_5 = np.nan
near_20 = np.nan
rows.append({
"entry": entry,
"group": f"{mode}_{kind}",
"n_pairs": int(len(ii)),
"rmsd_A_mean": float(np.mean(rmsd)),
"rmsd_A_std": float(np.std(rmsd)),
"contact_diff_A_mean": float(np.mean(contact_diff)),
"contact_diff_A_std": float(np.std(contact_diff)),
"same_rep_frac": same_rep_frac,
"time_gap_mean_same_rep": time_gap_mean,
"near_time_frac_gap_le_5": near_5,
"near_time_frac_gap_le_20": near_20,
})
return pd.DataFrame(rows)
def summarize_pass_rates(stats_df, summary_dir):
entries = sorted(stats_df["entry"].unique())
rows = []
def get(entry, group, col):
x = stats_df[(stats_df["entry"] == entry) & (stats_df["group"] == group)]
if len(x) == 0:
return np.nan
return float(x.iloc[0][col])
for entry in entries:
row = {"entry": entry}
for mode in ["all", "cross", "same"]:
h_r = get(entry, f"{mode}_high", "rmsd_A_mean")
m_r = get(entry, f"{mode}_mid", "rmsd_A_mean")
l_r = get(entry, f"{mode}_low", "rmsd_A_mean")
h_c = get(entry, f"{mode}_high", "contact_diff_A_mean")
m_c = get(entry, f"{mode}_mid", "contact_diff_A_mean")
l_c = get(entry, f"{mode}_low", "contact_diff_A_mean")
row[f"{mode}_rmsd_high"] = h_r
row[f"{mode}_rmsd_mid"] = m_r
row[f"{mode}_rmsd_low"] = l_r
row[f"{mode}_contact_high"] = h_c
row[f"{mode}_contact_mid"] = m_c
row[f"{mode}_contact_low"] = l_c
row[f"{mode}_delta_rmsd_low_high"] = l_r - h_r
row[f"{mode}_delta_contact_low_high"] = l_c - h_c
row[f"{mode}_rmsd_pass"] = int(h_r < l_r)
row[f"{mode}_contact_pass"] = int(h_c < l_c)
row[f"{mode}_strict_rmsd_pass"] = int(h_r < m_r < l_r)
row[f"{mode}_strict_contact_pass"] = int(h_c < m_c < l_c)
rows.append(row)
pass_df = pd.DataFrame(rows)
pass_path = summary_dir / "affinity_pass_summary.tsv"
pass_df.to_csv(pass_path, sep="\t", index=False)
report = {}
print("\n=== Pass rate ===")
for mode in ["all", "cross", "same"]:
report[mode] = {
"rmsd_pass": float(pass_df[f"{mode}_rmsd_pass"].mean()),
"contact_pass": float(pass_df[f"{mode}_contact_pass"].mean()),
"strict_rmsd_pass": float(pass_df[f"{mode}_strict_rmsd_pass"].mean()),
"strict_contact_pass": float(pass_df[f"{mode}_strict_contact_pass"].mean()),
"mean_delta_rmsd_low_high": float(pass_df[f"{mode}_delta_rmsd_low_high"].mean()),
"mean_delta_contact_low_high": float(pass_df[f"{mode}_delta_contact_low_high"].mean()),
}
print(f"\n[{mode}]")
for k, v in report[mode].items():
print(f"{k}: {v}")
with open(summary_dir / "affinity_pass_report.json", "w") as f:
json.dump(report, f, indent=2)
return pass_df
def save_minimal_cache(cache_dir, entry, q, top_idx, top_w, meta, compact=True):
cache_dir.mkdir(parents=True, exist_ok=True)
np.save(cache_dir / "q.npy", q.astype(np.float32))
if compact:
n_frames = q.shape[0]
if n_frames > 65535:
raise RuntimeError(
f"{entry}: n_frames={n_frames} > 65535, cannot save topk_neighbors as uint16."
)
np.save(cache_dir / "topk_neighbors.npy", top_idx.astype(np.uint16))
np.save(cache_dir / "topk_weights.npy", top_w.astype(np.float16))
meta["dtype_q"] = "float32"
meta["dtype_topk_neighbors"] = "uint16"
meta["dtype_topk_weights"] = "float16"
else:
np.save(cache_dir / "topk_neighbors.npy", top_idx.astype(np.int32))
np.save(cache_dir / "topk_weights.npy", top_w.astype(np.float32))
meta["dtype_q"] = "float32"
meta["dtype_topk_neighbors"] = "int32"
meta["dtype_topk_weights"] = "float32"
with open(cache_dir / "meta.json", "w") as f:
json.dump(meta, f, indent=2)
def process_one_entry(entry, args):
atlas_root = Path(args.atlas_root)
out_root = Path(args.out_root)
entry_dir = atlas_root / entry
cache_dir = out_root / entry
q_file = cache_dir / "q.npy"
topk_file = cache_dir / "topk_neighbors.npy"
weight_file = cache_dir / "topk_weights.npy"
meta_file = cache_dir / "meta.json"
if (
q_file.exists()
and topk_file.exists()
and weight_file.exists()
and meta_file.exists()
and not args.overwrite
):
if args.skip_existing_stats:
return None
coords_A, rep_ids, frame_ids, traj_lengths, rep_names, xtc_files = load_entry(entry_dir, entry)
n_frames = coords_A.shape[0]
n_ca = coords_A.shape[1]
ca_pairs = select_ca_distance_pairs(
coords_A[0],
cutoff_A=args.contact_cutoff_A,
min_seq_sep=args.min_seq_sep,
max_pairs=args.max_pairs,
)
X_dist = compute_distance_features(
coords_A,
ca_pairs,
chunk_size=args.feature_chunk_size,
)
X_mean = X_dist.mean(axis=0, keepdims=True)
X_std = X_dist.std(axis=0, keepdims=True) + 1e-6
Xz = (X_dist - X_mean) / X_std
pca_dim = min(args.pca_dim, Xz.shape[0] - 1, Xz.shape[1])
if pca_dim < 1:
raise RuntimeError(f"{entry}: invalid PCA dim.")
pca = PCA(
n_components=pca_dim,
svd_solver="randomized",
random_state=args.seed,
)
Y = pca.fit_transform(Xz).astype(np.float32)
q, tica_evals = fit_tica(
Y,
traj_lengths=traj_lengths,
lag=args.lag,
tica_dim=args.tica_dim,
)
A, top_idx, top_w = build_affinity_topk(
q,
sigma_k=args.sigma_k,
top_k=args.top_k,
)
meta = {
"entry": entry,
"n_frames": int(n_frames),
"n_ca": int(n_ca),
"n_replicates": int(len(traj_lengths)),
"rep_names": rep_names,
"traj_lengths": [int(x) for x in traj_lengths],
"xtc_files": xtc_files,
"pca_dim": int(pca_dim),
"tica_dim": int(q.shape[1]),
"tica_evals": [float(x) for x in tica_evals],
"lag": int(args.lag),
"sigma_k": int(args.sigma_k),
"top_k": int(args.top_k),
"contact_cutoff_A": float(args.contact_cutoff_A),
"min_seq_sep": int(args.min_seq_sep),
"max_pairs": int(args.max_pairs),
"n_ca_pairs_used": int(len(ca_pairs)),
"feature": "CA_pairwise_distances",
"affinity": "exp(-||q_i-q_j||^2/(sigma_i*sigma_j))",
"note": "Minimal training cache. Only q, top-k neighbors, top-k weights, and meta are saved.",
}
save_minimal_cache(
cache_dir=cache_dir,
entry=entry,
q=q,
top_idx=top_idx,
top_w=top_w,
meta=meta,
compact=not args.no_compact,
)
if args.no_stats:
return None
stats_df = evaluate_entry(
entry=entry,
A=A,
coords_A=coords_A,
X_dist=X_dist,
rep_ids=rep_ids,
frame_ids=frame_ids,
n_sample=args.n_sample,
)
return stats_df
def main():
parser = argparse.ArgumentParser()
parser.add_argument(
"--atlas_root",
default="/raid_zoe/home/lr/wangyi/p/atlas_1000_analysis",
)
parser.add_argument(
"--out_root",
default="/raid_zoe/home/lr/wangyi/p/atlas_affinity_cache_min",
)
parser.add_argument("--entry", default="all")
parser.add_argument("--max_entries", type=int, default=None)
parser.add_argument("--lag", type=int, default=10)
parser.add_argument("--pca_dim", type=int, default=50)
parser.add_argument("--tica_dim", type=int, default=3)
parser.add_argument("--sigma_k", type=int, default=30)
parser.add_argument("--top_k", type=int, default=64)
parser.add_argument("--contact_cutoff_A", type=float, default=12.0)
parser.add_argument("--min_seq_sep", type=int, default=3)
parser.add_argument("--max_pairs", type=int, default=20000)
parser.add_argument("--feature_chunk_size", type=int, default=256)
parser.add_argument("--n_sample", type=int, default=3000)
parser.add_argument("--seed", type=int, default=0)
parser.add_argument("--overwrite", action="store_true")
parser.add_argument("--no_compact", action="store_true")
parser.add_argument("--no_stats", action="store_true")
parser.add_argument("--skip_existing_stats", action="store_true")
args = parser.parse_args()
atlas_root = Path(args.atlas_root)
out_root = Path(args.out_root)
summary_dir = out_root / "_summary"
log_dir = out_root / "_logs"
out_root.mkdir(parents=True, exist_ok=True)
summary_dir.mkdir(parents=True, exist_ok=True)
log_dir.mkdir(parents=True, exist_ok=True)
entries = find_entries(
atlas_root,
entry=args.entry,
max_entries=args.max_entries,
)
print(f"atlas_root: {atlas_root}")
print(f"out_root: {out_root}")
print(f"entries: {len(entries)}")
print(f"minimal cache files per protein: q.npy, topk_neighbors.npy, topk_weights.npy, meta.json")
print(f"compact mode: {not args.no_compact}")
all_stats = []
success = []
failed = []
for entry in tqdm(entries, desc="proteins"):
try:
stats_df = process_one_entry(entry, args)
success.append(entry)
if stats_df is not None:
all_stats.append(stats_df)
except Exception as e:
failed.append(entry)
err_file = log_dir / f"{entry}.error.txt"
with open(err_file, "w") as f:
f.write(traceback.format_exc())
print(f"\n[FAILED] {entry}: {e}")
with open(log_dir / "success.txt", "w") as f:
f.write("\n".join(success) + "\n")
with open(log_dir / "failed.txt", "w") as f:
f.write("\n".join(failed) + "\n")
if len(all_stats) > 0:
all_stats_df = pd.concat(all_stats, axis=0, ignore_index=True)
all_stats_path = summary_dir / "all_affinity_sanity_all_cross_same.tsv"
all_stats_df.to_csv(all_stats_path, sep="\t", index=False)
print(f"\nSaved sanity stats: {all_stats_path}")
summarize_pass_rates(all_stats_df, summary_dir)
print("\nDone.")
print(f"Success: {len(success)}")
print(f"Failed: {len(failed)}")
print(f"Logs: {log_dir}")
print(f"Summary: {summary_dir}")
if __name__ == "__main__":
main()