SolitaryThinker
a9e5f6ee7a
Directory rename (git mv, history preserved) plus rewrite of all references: absolute imports in tests, the zero-dep runner, docstrings, comments, and the README. No behavior change. Run: python3 -m pytest v2/tests/ -q ; python3 v2/run_tests.py ; python3 -m v2.examples
121 lines
5.7 KiB
Python
121 lines
5.7 KiB
Python
"""WanDenoiseLoop — the canonical driven denoise loop (design_v3 §5, §15a).
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Bidirectional video diffusion: N flow-match steps over the full latent. Composed from policies
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(CFG / flow-shift / precision / expert routing) — the default decomposition. ``next`` is
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kernel-free (it builds the forward+combine+solver thunk); ``advance`` folds the result and,
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under the ROLLOUT profile, captures a behavior slice — so the *same* loop serves and rolls out
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for RL (design_v3 §10). All per-request state lives in ``LoopState`` (interleave-safe).
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"""
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from __future__ import annotations
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import numpy as np
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from ..._enums import ExecutionProfile, WorkUnitKind
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from ...loop.contracts import (
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Done,
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LoopResult,
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LoopState,
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ResourceRequest,
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ShapeSignature,
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StepContext,
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StepResult,
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WorkPlan,
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)
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from ...loop.sampler import flow_match_euler_step
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from ...request.streams import StreamChunk
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from ..backend import LATENT_CHANNELS
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def latent_shape(req) -> tuple[int, int, int, int]:
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"""Map request geometry to a small (deterministic) latent for the CPU toy backend."""
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d = req.diffusion
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t = max(1, d.num_frames // 40)
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h = max(2, d.height // 120)
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w = max(2, d.width // 120)
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return (LATENT_CHANNELS, t, h, w)
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class WanDenoiseLoop:
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def __init__(self, *, loop_id, cfg, flow_shift, precision, expert, cost):
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self.loop_id = loop_id
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self.cfg = cfg
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self.flow_shift = flow_shift
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self.precision = precision
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self.expert = expert
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self.cost = cost
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def init(self, req, model, ctx) -> LoopState:
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seed = req.diffusion.seed if req.diffusion.seed is not None else 0
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rng = np.random.default_rng(seed)
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sig = self.flow_shift.build_schedule(req.diffusion.num_steps, req.diffusion.height,
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req.diffusion.width, sigmas=req.diffusion.sigmas or None)
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shape = latent_shape(req)
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x = (rng.standard_normal(shape) * float(sig[0])).astype("float32")
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st = LoopState(loop_id=self.loop_id, instance_id=model.card.model_id,
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request_id=req.request_id, profile=ctx.profile, rng=rng, seed=seed,
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latents={"video": x}, sigmas=[float(s) for s in sig],
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timesteps=[float(s) * 1000.0 for s in sig])
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st.cond["prompt_embeds"] = ctx.slots.get("text_embeds")
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st.cond["negative_prompt_embeds"] = ctx.slots.get("neg_text_embeds")
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st.scratch["guidance_scale"] = float(req.diffusion.guidance_scale)
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st.scratch["stream_video"] = bool(req.outputs.stream.get("video"))
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st.plugin_state["cfg"] = {}
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return st
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def next(self, st: LoopState):
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i = st.step_idx
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if i >= len(st.sigmas) - 1:
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return Done()
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sigma_t, sigma_next = st.sigmas[i], st.sigmas[i + 1]
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expert_id = self.expert.expert_for(StepContext(i, st.timesteps[i], sigma_t))
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sctx = StepContext(step_idx=i, timestep=st.timesteps[i], sigma=sigma_t, active_expert_id=expert_id)
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cfg_state = st.plugin_state["cfg"]
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branches = self.cfg.branches_this_step(sctx, cfg_state)
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x = st.latents["video"]
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pe, ne = st.cond["prompt_embeds"], st.cond["negative_prompt_embeds"]
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scale = st.scratch["guidance_scale"]
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cfg, precision = self.cfg, self.precision
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def run(model, override=None):
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if override is not None and "noise_pred" in override:
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velocity = np.asarray(override["noise_pred"], dtype="float32")
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else:
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dit = model.component(expert_id)
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preds = {b: dit(x, pe if b == "cond" else ne, sigma_t) for b in branches}
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velocity = cfg.combine(preds, scale, sctx, cfg_state)
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x_next = flow_match_euler_step(precision.cast(x), precision.cast(velocity), sigma_t, sigma_next)
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return StepResult(output={"noise_pred": np.asarray(velocity, dtype="float32"),
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"latents": x_next.astype("float32")})
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cond_bytes = sum(int(np.asarray(e).nbytes) for e in (pe, ne) if e is not None)
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res = ResourceRequest(
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compute_seconds=self.cost.predict(int(np.prod(x.shape)), float(len(branches))),
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resident_bytes=int(x.nbytes) + cond_bytes, # latents + conditioning held for the loop
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peak_activation_bytes=int(x.nbytes)) # one step's transient working buffer
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emits = []
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if st.scratch.get("stream_video"):
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emits.append(StreamChunk(stream_id=st.request_id, modality="video", seq=i,
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data=x, preview=True)) # carry the latent as a preview payload
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return WorkPlan(
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loop_id=self.loop_id, instance_id=st.instance_id, kind=WorkUnitKind.DIFFUSION_STEP,
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shape_sig=ShapeSignature(WorkUnitKind.DIFFUSION_STEP, dims=tuple(x.shape),
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extra=(("cfg", type(cfg).__name__),)),
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resources=res, payload={"branch": "combined", "step": i}, run=run,
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label=f"wan.denoise.{i}", emits=emits)
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def advance(self, st: LoopState, result: StepResult) -> LoopState:
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st.latents["video"] = result.output["latents"]
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if st.profile == ExecutionProfile.ROLLOUT:
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st.trajectory.append({
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"step": st.step_idx, "sigma": st.sigmas[st.step_idx],
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"velocity": np.asarray(result.output["noise_pred"]).copy(),
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"latents": np.asarray(st.latents["video"]).copy(),
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})
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st.step_idx += 1
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return st
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def finalize(self, st: LoopState) -> LoopResult:
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return LoopResult(outputs={"latents": st.latents["video"]},
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metrics={"denoise_steps": float(st.step_idx)},
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behavior=st.trajectory or None)
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