wehub-resource-sync
73 lines
4.5 KiB
JSON
73 lines
4.5 KiB
JSON
{
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"skill": "interview-cheatsheet",
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"source": "docs/tutorials/video_generation_tutorial.md",
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"source_sha256_prefix": "4aaa64ff3f54473d",
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"output": "docs/tutorials/video_generation_tutorial.html",
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"topic": "Video Generation (Sora / Hunyuan-Video / Kling / Wan / Mochi / Movie Gen / OpenSora)",
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"effort": "max",
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"byline": "Ruofeng Yang (杨若峰), Shanghai Jiao Tong University",
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"math_code_review": {
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"reviewer": "codex gpt-5.5 xhigh, fresh thread per run (never codex-reply)",
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"verdict": "PASS",
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"rounds": [
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{
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"run": 1,
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"verdict": "FAIL",
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"thread_id": "019e3ea6-56ba-7ce0-826b-a8fbb8cbc682",
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"issue": "I2V broadcast over raw T instead of latent t; 32x45x80 ≠ 28800; 1080p latent height 135 not divisible by 2; Q11 causal Conv3d T=1 derivation wrong; Q13 Mochi VAE 4x8x8 attribution wrong; A.2 code does not mask reference frame; A.3 sampler T//4 off-by-one + undefined `euler_sampler_rf` / `model_dit_only`; Kling 2024-03 (should be 2024-06); CogVideoX 2024-05 (should be 2024-08); AnimateDiff 2024-07 (should be arXiv 2023-07 / ICLR 2024); recruitment context '2026 春招视角'; length 1343 lines (34% over)",
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"fix": "Fixed I2V broadcast to latent time; corrected math in §10.1 table; rewrote Q11 with correct output length and weight activation argument; corrected Q13 with model-specific config; rewrote A.2 / A.3 with mask-aware loss + clean ref clamp; updated timeline; removed recruitment phrase; trimmed file to 1208 lines"
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},
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{
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"run": 2,
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"verdict": "FAIL",
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"thread_id": "019e3eb5-95cc-7901-9d8c-185a1d2ba2c7",
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"issue": "Q11 still over-counts output length; A.2 noised reference latent (broke noise-only-on-future-frames trick); Q21 standard 3D VAE T=1 claim incorrect; RoPE-3D formula written as matrix product instead of block-diagonal concat",
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"fix": "Re-derived Q11 with conv output length formula yielding output_t=1; added z_tau clamp to z1 at reference position before run_dit in video_gen_forward; corrected Q21 to use floor notation and acknowledge symmetric 3D VAE also has T=1 zero-pad behavior; rewrote RoPE-3D as block-diagonal concat"
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},
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{
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"run": 3,
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"verdict": "FAIL",
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"thread_id": "019e3ebd-a75c-7a50-96ff-1961fc8fa4b9",
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"issue": "§4.1 factorized table composition order inconsistent with code (TempAttn outer instead of inner); §4.1 memory column too small; A.3 sampler did not clamp ref before first run_dit step; Wan 2.2 date 2025-08 (should be 2025-07-28)",
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"fix": "Corrected §4.1 to TempAttn(SpatialAttn(x)) and full score-memory O(T_t S^2 + S T_t^2); added pre-loop clamp to z = where(ref_mask, ref_full, z) before Euler integration; updated Wan 2.2 to 2025-07"
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},
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{
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"run": 4,
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"verdict": "FAIL",
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"thread_id": "019e3ec5-1a1d-76d2-b636-87d2556c3226",
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"issue": "Sora patch size stated as 'p_t=1, p_h=p_w=2' as if disclosed (it isn't); SD3-Video referenced as if a public model (it isn't); RoPE-3D in Q15 still written as matrix product",
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"fix": "Softened Sora patch claim to 'Sora 未公开 / 开源复刻常用 p_t=1, p_h=p_w=2'; replaced SD3-Video with Wan / Hunyuan / Mochi where appropriate; rewrote Q15 RoPE-3D as block-diagonal concat formula"
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},
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{
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"run": 5,
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"verdict": "PASS",
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"thread_id": "019e3ecd-dadc-7091-8ae4-1098b84e16d4",
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"issue": null,
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"fix": null
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}
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]
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},
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"render_review": {
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"reviewer": "codex gpt-5.5 xhigh, fresh thread per run (never codex-reply)",
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"verdict": "PASS",
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"rounds": [
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{
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"run": 1,
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"verdict": "FAIL",
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"thread_id": "019e3ed2-82e7-7412-9dba-ba5310dbf560",
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"issue": "Q12 summary tag contained raw markdown `**表达力**` (HTML <summary> does not process markdown bold)",
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"fix": "Removed bold markers from Q12 summary in source MD; re-rendered HTML"
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},
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{
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"run": 2,
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"verdict": "PASS",
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"thread_id": "019e3ed5-4188-7713-89e4-fc7e22f3cdef",
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"issue": null,
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"fix": null
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}
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]
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},
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"summary": "5-round math/code review (4 FAIL → 1 PASS) + 2-round render review (1 FAIL → 1 PASS). Issues caught: I2V time-axis confusion, multiple arithmetic errors in attention/VAE complexity tables, Q11 causal Conv3d T=1 derivation, model-citation timeline corrections (Kling / CogVideoX / AnimateDiff / Wan 2.2), Sora/SD3-Video over-attribution, A.2/A.3 I2V noise/clamp trick, RoPE-3D block-diagonal vs matrix-product, Q12 summary raw-markdown leak.",
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"rendered_at": "2026-05-19"
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}
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