First net-new architecture ported via the self-contained recipe-package pattern
(card-declared adapter + new loop, no shared-dispatch edit):
* CosmosDenoiseLoop (v2/recipes/cosmos2/loop.py): EDM preconditioning folded into
a flow-match Euler integrator. Faithful port of CosmosDenoisingStage — Karras
sigma schedule (rho=7, sigma_max=80 -> sigma_min=0.002, terminal clamp), latent
init randn*sigma_max, per-step c_in/c_skip/c_out (sigma_data=1) -> x0, CFG in x0
space, x0 -> velocity (x-x0)/sigma, FLOW_MATCH_STEP. video2world frame-replace
conditioning threaded but inert for the t2v preset.
* build_karras_sigmas helper added to v2/loop/sampler.py.
* CosmosDiT + CosmosT5Encoder adapters (v2/platform/backends/torch_cosmos.py),
declared on the card via ComponentSpec.adapter (the ac29750b enabler) — DiT
returns raw EDM output + builds the mandatory zero condition/padding masks + fps;
T5 uses the raw last_hidden_state (no Wan zero-pad). Reuses the WanVAE adapter.
* card/program/registry (HF id nvidia/Cosmos-Predict2-2B-Video2World + arch
fallback on CosmosTransformer3DModel) + COSMOS_NEG prompt + SamplingDefaults
(35 steps, gs 7, 704x1280, 93f, 16fps).
CPU-verified: Karras schedule, card/program build, registry resolve (id + arch),
EDM loop runs end-to-end on the CPU toy backend. GPU load/run is BRINGUP.
v2 mini green (211 passed, 2 skipped); pre-commit clean.
SolitaryThinker
bfbd90ea3a