96 lines
3.3 KiB
Python
96 lines
3.3 KiB
Python
"""Model checkpoint resolution and caching for eval metrics.
|
|
|
|
Single public function — :func:`ensure_checkpoint` — that hands a metric
|
|
a local path to its weights, downloading on miss. Three source kinds:
|
|
|
|
* an existing local path → returned as-is;
|
|
* an HTTP(S) URL → downloaded to ``get_cache_dir() / name`` via
|
|
``huggingface_hub.http_get`` (resume + retries built in);
|
|
* an HF repo id (``"org/repo"``) → :func:`huggingface_hub.hf_hub_download`
|
|
if *filename* is given, else :func:`huggingface_hub.snapshot_download`.
|
|
*name* is ignored in HF mode — HF manages its own cache key under
|
|
``~/.cache/huggingface/hub``.
|
|
|
|
All download paths are filelock-safe (cooperative across threads,
|
|
processes, and SLURM ranks) via :func:`fastvideo.utils.get_lock`.
|
|
"""
|
|
|
|
from __future__ import annotations
|
|
|
|
import os
|
|
from pathlib import Path
|
|
|
|
from fastvideo import envs
|
|
from fastvideo.utils import get_lock
|
|
|
|
|
|
def get_cache_dir() -> Path:
|
|
"""Eval cache root.
|
|
|
|
Layout::
|
|
|
|
get_cache_dir() / models / ← URL-fetched checkpoints (LAION head,
|
|
AMT, GRiT, …)
|
|
get_cache_dir() / torch / ← redirected ``TORCH_HOME`` (DINO etc.)
|
|
get_cache_dir() / clip / ← passed as ``download_root`` to
|
|
``clip.load(...)`` callsites
|
|
~/.cache/huggingface/hub / ← left at HF's default; widely shared
|
|
with other ML projects
|
|
|
|
Override priority: ``FASTVIDEO_EVAL_CACHE`` > ``${FASTVIDEO_CACHE_ROOT}/eval``.
|
|
|
|
Metric authors writing new code: when wrapping a third-party loader
|
|
that has its own cache convention (CLIP's ``download_root``, pyiqa's
|
|
``cache_dir``, etc.), pass ``str(get_cache_dir() / "<library>")`` so
|
|
users get a single ``FASTVIDEO_EVAL_CACHE`` knob to redirect them all.
|
|
"""
|
|
return Path(envs.FASTVIDEO_EVAL_CACHE.get())
|
|
|
|
|
|
def ensure_checkpoint(
|
|
name: str,
|
|
source: str,
|
|
filename: str | None = None,
|
|
) -> str:
|
|
"""Resolve a model checkpoint path, downloading on miss.
|
|
|
|
See module docstring for the full source contract. *name* is used
|
|
only as the local cache filename for URL sources; ignored otherwise.
|
|
"""
|
|
if os.path.exists(source):
|
|
return source
|
|
|
|
if source.startswith(("http://", "https://")):
|
|
return _ensure_url(name, source)
|
|
|
|
if "/" in source:
|
|
return _ensure_hf(source, filename)
|
|
|
|
raise ValueError(f"Cannot resolve checkpoint: source {source!r} is neither a "
|
|
"path, URL, nor HF repo id")
|
|
|
|
|
|
def _ensure_url(name: str, url: str) -> str:
|
|
local = get_cache_dir() / "models" / name
|
|
if local.exists():
|
|
return str(local)
|
|
|
|
local.parent.mkdir(parents=True, exist_ok=True)
|
|
with get_lock(url):
|
|
if local.exists(): # racing process won; reuse its result
|
|
return str(local)
|
|
from huggingface_hub.file_download import http_get
|
|
tmp = local.with_suffix(local.suffix + ".tmp")
|
|
with open(tmp, "wb") as f:
|
|
http_get(url, f)
|
|
tmp.rename(local)
|
|
return str(local)
|
|
|
|
|
|
def _ensure_hf(repo_id: str, filename: str | None) -> str:
|
|
from huggingface_hub import hf_hub_download, snapshot_download
|
|
with get_lock(f"{repo_id}/{filename or '*'}"):
|
|
if filename:
|
|
return hf_hub_download(repo_id=repo_id, filename=filename)
|
|
return snapshot_download(repo_id=repo_id)
|