tokenizer/chat_template.jinja ships as its own file in the LTX-2 and
HunyuanVideo-1.5 repos and apply_chat_template reads it at generation
time, so a scoped snapshot without it loads fine and then crashes the
first generation.
A warm-cache predownload sweep never consults the cancel event (each cached
file returns instantly), so an unload during it was ignored until a cold
file hit the network. The 2.3 detection also only probed bare-file local
repos; resolve directory repos through the same child resolver the loader
uses so their base pull is scoped too.
- Run the trainer's caption discovery in the start route BEFORE freeing GPU
residents, so a missing or uncaptionable dataset 400s without evicting the
loaded chat/Images model.
- sd.cpp unload now waits out a cancelled one-shot generation on the generate
lock before reporting the device free, matching the diffusers backend.
- Clearing a caption that came from metadata.jsonl writes an empty sidecar
tombstone instead of unlinking (both readers treat an existing sidecar as
authoritative), so the cleared label cannot resurface.
- The ControlNet wrapper pipe is only cached while its load is still current,
closing the unload race the model cache already handled.
The prefetch already scopes the file list (no packaged root singles, no
dtype-variant twins, no ONNX/Flax exports), but from_pretrained was then
called with the hub id, and its own snapshot sweep re-downloaded the
skipped files anyway: 24 GB per FLUX.1 repo and 65 GB on FLUX.2-dev, as
found in the blob cache. Return the snapshot dir from the prefetch (keyed
on the pipeline manifest) and hand it to every pipeline-assembly
from_pretrained site; any prefetch failure keeps the hub id and the old
behavior.
A 2.3 checkpoint (GGUF or single file) carries the DiT and, with its extras
files, the connectors, both VAEs and the vocoder; only the 2.0 base repo's
scheduler, text encoder and tokenizer are read. Detect 2.3 from the
checkpoint header after the pull, re-estimate, and scope the base
pre-download accordingly (about 6 GB less per fresh install).
A bare from_pretrained snapshot of Lightricks/LTX-2 pulls the whole 314 GB
repo: 170 GB of packaged root checkpoints and a second 50 GB text-encoder
shard set, when the pipeline reads about 93 GB. Build the needed file list
once (shared with the progress estimate so the two cannot disagree),
download it per file with cancellation, and hand from_pretrained the local
snapshot dir. Clamp the progress counter to the estimate so stale cache
blobs can no longer report over 100 percent.
