202 lines
7.6 KiB
Python
202 lines
7.6 KiB
Python
import logging
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import math
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import torch
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log = logging.getLogger(__name__)
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def build_temporal_cost(q_token_idx, Lq, Lk, device, dtype, tokens_per_frame):
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"""Gaussian penalty matrix [Lq, Lk] for video cross-attention (integer frame indexing)."""
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offset = torch.zeros(Lq, Lk, device=device, dtype=dtype)
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query_frames = torch.arange(Lq, device=device, dtype=torch.long) // tokens_per_frame
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for seg in q_token_idx:
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local = seg["local_token_idx"].to(device=device)
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d = (query_frames.float()[:, None] - seg["midpoint"]).abs()
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strength = seg.get("strength", 1.0)
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cost = strength * (torch.relu(d - seg["window"]) ** 2) / (2 * seg["sigma"] ** 2)
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offset[:, local] = cost.to(offset.dtype)
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return offset
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def build_temporal_cost_scaled(q_token_idx, Lq, Lk, device, dtype, latent_frames):
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"""Penalty matrix for queries that don't map to integer frames (e.g. LTXAV audio tokens)."""
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offset = torch.zeros(Lq, Lk, device=device, dtype=dtype)
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query_frames = torch.arange(Lq, device=device, dtype=torch.float32) * latent_frames / Lq
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for seg in q_token_idx:
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local = seg["local_token_idx"].to(device=device)
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d = (query_frames[:, None] - seg["midpoint"]).abs()
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sigma_a = seg.get("sigma_audio", seg["sigma"])
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window_a = seg.get("window_audio", seg["window"])
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strength_a = seg.get("strength_audio", 1.0)
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cost = strength_a * (torch.relu(d - window_a) ** 2) / (2 * sigma_a ** 2)
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offset[:, local] = cost.to(offset.dtype)
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return offset
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def create_mask_fn(q_token_idx, fallback_tokens_per_frame, latent_frames):
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"""Closure: mask_fn(q, k, transformer_options) -> additive mask or None."""
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cache = {}
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max_token_idx = max(int(seg["local_token_idx"].max().item()) for seg in q_token_idx) + 1
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def mask_fn(q, k, transformer_options):
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Lq, Lk = q.shape[1], k.shape[1]
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if Lq == Lk:
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return None
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# Only apply on conditional pass — not unconditional (negative prompt)
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cond_or_uncond = transformer_options.get("cond_or_uncond", [])
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if 1 in cond_or_uncond and 0 not in cond_or_uncond:
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return None
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grid_sizes = transformer_options.get("grid_sizes", None)
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video_tpf = int(grid_sizes[1]) * int(grid_sizes[2]) if grid_sizes is not None else fallback_tokens_per_frame
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video_lq = latent_frames * video_tpf
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# Skip cross-modal attention — text keys are padded to a fixed length ≥ max_token_idx and != video_lq
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if Lk == video_lq or Lk < max_token_idx:
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return None
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mode = "video" if Lq == video_lq else "scaled"
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key = (Lq, Lk, mode, q.device)
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if key not in cache:
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if mode == "video":
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cost = build_temporal_cost(q_token_idx, Lq, Lk, q.device, q.dtype, video_tpf)
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else:
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cost = build_temporal_cost_scaled(q_token_idx, Lq, Lk, q.device, q.dtype, latent_frames)
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log.info(
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"[PromptRelay] Built penalty matrix (%s): Lq=%d, Lk=%d, nonzero=%d/%d",
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mode, Lq, Lk, (cost > 0).sum().item(), cost.numel(),
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)
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cache[key] = -cost
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return cache[key].to(q.dtype)
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return mask_fn
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def build_segments(token_ranges, segment_lengths, epsilon=1e-3, relay_options=None):
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"""Per-segment metadata for the temporal penalty.
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relay_options (optional dict) overrides per-stream knobs:
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video_strength, video_window_scale,
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audio_epsilon, audio_strength, audio_window_scale
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Audio knobs only affect architectures whose cross-attention takes the scaled
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(non-integer-frame) path — currently LTX audio_attn2.
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"""
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# Paper uses constant sigma = 1/ln(1/epsilon) regardless of segment length
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sigma = 1.0 / math.log(1.0 / epsilon) if 0 < epsilon < 1 else 0.1448
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opts = relay_options or {}
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v_strength = opts.get("video_strength", 1.0)
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v_window_scale = opts.get("video_window_scale", 1.0)
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a_epsilon = opts.get("audio_epsilon")
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a_strength = opts.get("audio_strength", 1.0)
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a_window_scale = opts.get("audio_window_scale", 1.0)
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if a_epsilon is not None and 0 < a_epsilon < 1:
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sigma_audio = 1.0 / math.log(1.0 / a_epsilon)
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else:
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sigma_audio = sigma
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if relay_options:
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log.info(
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"[PromptRelay] Advanced options active — video: strength=%.3f window_scale=%.3f | "
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"audio: epsilon=%s strength=%.3f window_scale=%.3f",
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v_strength, v_window_scale,
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f"{a_epsilon:.4f}" if a_epsilon is not None else "inherit",
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a_strength, a_window_scale,
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)
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q_token_idx = []
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frame_cursor = 0
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for (tok_start, tok_end), L in zip(token_ranges, segment_lengths):
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if L <= 0:
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frame_cursor += L
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continue
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midpoint = (2 * frame_cursor + L) // 2
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base_window = max(L // 2 - 2, 0)
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q_token_idx.append({
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"local_token_idx": torch.arange(tok_start, tok_end),
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"midpoint": midpoint,
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"window": max(base_window * v_window_scale, 0.0),
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"sigma": sigma,
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"strength": v_strength,
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"window_audio": max(base_window * a_window_scale, 0.0),
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"sigma_audio": sigma_audio,
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"strength_audio": a_strength,
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})
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frame_cursor += L
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return q_token_idx
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def get_raw_tokenizer(clip):
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"""Extract the raw SPiece/HF tokenizer from a ComfyUI CLIP object."""
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tokenizer_wrapper = clip.tokenizer
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for attr_name in dir(tokenizer_wrapper):
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if attr_name.startswith("_"):
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continue
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inner = getattr(tokenizer_wrapper, attr_name, None)
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if inner is not None and hasattr(inner, "tokenizer"):
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return inner.tokenizer
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raise RuntimeError(
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f"Could not find raw tokenizer on CLIP object. "
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f"Known attributes: {[a for a in dir(tokenizer_wrapper) if not a.startswith('_')]}"
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)
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def map_token_indices(raw_tokenizer, global_prompt, local_prompts):
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"""Tokenize global + space-prefixed locals; return (full_prompt, per-local token ranges).
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Uses incremental tokenization to avoid SentencePiece context-dependency issues.
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"""
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prefixed_locals = [" " + lp for lp in local_prompts]
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full_prompt = global_prompt + "".join(prefixed_locals)
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has_eos = getattr(raw_tokenizer, "add_eos", False)
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eos_adj = 1 if has_eos else 0
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prev_len = len(raw_tokenizer(global_prompt)["input_ids"]) - eos_adj
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token_ranges = []
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built = global_prompt
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for plp in prefixed_locals:
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built += plp
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cur_len = len(raw_tokenizer(built)["input_ids"]) - eos_adj
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if cur_len <= prev_len:
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raise ValueError(f"Local prompt produced no tokens: '{plp.strip()}'")
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token_ranges.append((prev_len, cur_len))
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prev_len = cur_len
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return full_prompt, token_ranges
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def distribute_segment_lengths(num_segments, latent_frames, specified_lengths=None):
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"""Validate or auto-distribute segment frame counts, capped to fit within latent_frames."""
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if specified_lengths:
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if len(specified_lengths) != num_segments:
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raise ValueError(
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f"Number of segment_lengths ({len(specified_lengths)}) "
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f"must match number of local prompts ({num_segments})"
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)
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lengths = specified_lengths
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else:
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# ceil division — matches reference implementation
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step = -(-latent_frames // num_segments)
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lengths = [step] * num_segments
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effective = []
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cursor = 0
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for L in lengths:
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end = min(cursor + L, latent_frames)
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effective.append(max(end - cursor, 0))
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cursor = end
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return effective
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