[{"data":1,"prerenderedAt":128},["ShallowReactive",2],{"run:mcmc-combo-iter-bisect":3,"run-findings:mcmc-combo-iter-bisect":102},{"run":4,"config":17,"metrics":48,"curve":54,"assets":101},{"id":5,"title":5,"subtitle":6,"eyebrow":7,"date":8,"workspace":9,"commit":10,"tags":11,"verdict":16},"mcmc-combo-iter-bisect","MCMC segfault 切り分け #3: noise + L1、log_every=1 で iter localize","Run summary · A.2 debug","2026-05-23","splat","c5a29eb",[12,13,14,15],"debug","mcmc","smoke","iter-bisect","partial",[18,21,24,27,30,33,36,39,42,45],{"key":19,"value":20},"dataset","\u002FUsers\u002Fotkrickey\u002Fdev\u002F3dgs-workspace\u002Fdatasets\u002Fnerf_synthetic\u002Flego",{"key":22,"value":23},"iterations","20",{"key":25,"value":26},"seed","42",{"key":28,"value":29},"capacity","1,000,000 splats",{"key":31,"value":32},"sh_degree","3",{"key":34,"value":35},"loss","L1Ssim",{"key":37,"value":38},"lambda","0.200",{"key":40,"value":41},"ssim","window=7 sigma=1",{"key":43,"value":44},"backend.backward","Simd",{"key":46,"value":47},"backend.loss_path","Gpu",{"psnr":49,"wallclock":50,"wallclock_regress":51,"splats":52,"final_loss":53},5.1915082931518555,"0.57s",false,5207,"4.498876e-1",{"loss":55,"splats":98},{"iters":56,"values":77},[57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76],1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,[78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97],0.34533900022506714,0.348058819770813,0.35427162051200867,0.3514305353164673,0.35712358355522156,0.3620043098926544,0.35663682222366333,0.36467304825782776,0.3765072822570801,0.38413432240486145,0.38539618253707886,0.3839292526245117,0.39540746808052063,0.4082734286785126,0.4054069519042969,0.4122486114501953,0.417144775390625,0.4392422139644623,0.44074857234954834,0.44988757371902466,{"iters":99,"values":100},[57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76],[52,52,52,52,52,52,52,52,52,52,52,52,52,52,52,52,52,52,52,52],{"has_renders":51,"has_splat":51},[103],{"id":104,"title":105,"date":8,"status":106,"polarity":107,"category":108,"axes":109,"tags":110,"task_code":116,"related_runs":117,"delta_psnr":123,"delta_wallclock":-1,"rank":124,"verdict":125,"impact_summary":126,"detail_path":127},"mcmc-noise-calibration","A.2 MCMC 検証で発覚した noise gate 不整合と L1 全滅 segfault","stable","negative","experiment",[57],[111,13,112,113,114,14,115],"phase-5","sgld-noise","calibration","regression","segfault","A.2",[118,119,120,5,121,122],"lego-mcmc-30k","mcmc-l1-only-smoke","mcmc-noise-sh3-smoke","mcmc-combo-500","mcmc-l1-500","2.5 dB (sh=3 + 全部入り、50 iter で発散)","high","investigative","SGLD gate を paper 式に揃えた結果 mean_noise_weight が ~50-150x スケールズレし、calibration 補正 (5e5→5e3) でも iter 240 前後で SIGSEGV。Bisect smoke で真因が L1 全滅 → refine prune → 空 buffer crash というアルゴリズム順序問題と判明。Calibration ≠ correctness。","\u002Ffindings\u002Fmcmc-noise-calibration\u002F",1782449788244]