feat(export): 改为按 clusters/ 目录导出，并重定位失效的软链

原来按 assignments.csv 导出，反映的是聚类当时的划分；而 clusters/ 目录会被人工
整理——挪动分错的图、把 cluster_03 改名成 grease。现在以整理后的目录为准。

- 扫描 clusters/ 下的子目录，目录名即类别名并原样保留（不再是数字编号）
- 文件名用原图的名字，去掉 clusters/ 里的 NNNN_ 排序前缀
- 失效软链的重定位：读出链接目标，按其中的 data/ 段落到本机 --source-root 上；
  再不行用文件名在源目录里兜底索引（惰性构建，用不到就不扫盘）。
  从服务器拷回来的 clusters/ 软链全部指向 /home/deep/... 在本机失效，这是常态
- 解析不到的条目列出并中止，--skip-missing 可忽略
- manifest 记录类别、每张图的原始路径与被跳过的条目

在真实目录上验证：11,212 张、15 个类别，软链 100% 失效但全部重定位成功，
导出后抽查 200 张与原图逐字节一致。跨数据集的数字文件名（blue/113.bmp 与
pearlescent/113.bmp）会被重名检查拦下，--prefix-parent 可化解。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

README.md

@@ -262,38 +262,34 @@ scatter:
 
 ### 按聚类结果导出数据集
 
-人工核对完分组后，把结果落成一个可以直接使用的数据集目录：
+聚类产出的 `clusters/` 里是**软链**，方便人工翻看和调整——可以把图在子目录间挪动、
+删掉分错的、把 `cluster_03` 改名成 `grease`。整理完之后，以这个目录为准把**真实文件**
+复制出来，得到一个可以直接使用的数据集：
 
 ```bash
-uv run python scripts/export_clusters.py --work-dir runs/simclr_r18            # 先看计划加 --dry-run
+uv run python scripts/export_clusters.py --work-dir runs/simclr_r101 --prefix-parent
+#                                                              先看计划加 --dry-run
 ```
 
 ```
-data/film_r18_cluster_k4/     # <源目录名>_<骨架标签>_cluster_k<簇数>，自动推导
-├── 0/                        # 簇 0 的图，文件名保持原样
-├── 1/
-├── 2/
-├── 3/
-└── manifest.json             # 来源 run、特征配置、每张图的原始路径
+data/simclr_r101/          # 默认取 work_dir 的名字，--out 可完全指定
+├── grease/                # 子目录名沿用 clusters/ 里的（人工整理过的类别名）
+├── mosquito/
+├── normal/
+└── manifest.json          # 每张图的原始路径与所属类别，便于追溯
 ```
 
-**复制真实文件**，不是软链，所以这个目录可以直接拷走或喂给别的工具。
+导出的是**真实文件**（不是软链），文件名用原图的名字、去掉 `clusters/` 里的 `0125_`
+排序前缀。加 `--prefix-parent` 会再拼上原父目录名（`反面纵黑点/abc.png` ->
+`反面纵黑点_abc.png`），既保住来源信息，也化解不同目录同名文件撞车。
 
-默认保持原文件名。加 `--prefix-parent` 会把原父目录名拼到文件名前：
+> **从服务器拷回来的 `clusters/` 软链全都是坏的**（指向 `/home/deep/...`），不影响使用：
+> 脚本读出链接目标，按其中的 `data/` 段重新落到本机 `--source-root`（默认当前目录）上；
+> 万一还找不到，再用文件名在源目录里兜底索引一次。解析不到的条目会列出来并中止，
+> 确认要忽略就加 `--skip-missing`。
 
-```bash
-uv run python scripts/export_clusters.py --work-dir runs/simclr_r18 --prefix-parent
-# back-mosquito-G0/5.14_677mmX316.10m_....png -> back-mosquito-G0_5.14_677mmX316.10m_....png
-```
-
-导出后目录只剩簇号，原来的来源信息就没了——加前缀能留住它，人工核对时一眼看出
-某张图原本在哪个目录；顺带也化解不同子目录同名文件在同一个簇里撞车的情况
-（撞车时的报错也会提示可以试试这个开关）。
-目录名可用 `--tag r18ss` 换标签、`--out` 完全指定。几个保护：源文件缺失、
-同簇内出现重名（保持原名会互相覆盖）都会直接报错；目标目录非空时必须显式 `--overwrite`。
-
-> 标签只反映骨架，不区分 pretrained 与 simclr——同一骨架的两种跑法会推出同名目录，
-> 需要并存时用 `--tag` 手动区分。无论目录叫什么，`manifest.json` 都记着这批图来自哪次 run。
+几个保护：同类别内重名（保持原名会互相覆盖）直接报错并提示可用 `--prefix-parent`；
+目标目录非空时必须显式 `--overwrite`。
 
 ### 自监督预训练（SimCLR）
 

scripts/export_clusters.py

@@ -1,38 +1,35 @@
 #!/usr/bin/env python
-"""按聚类结果把原图复制成一个新数据集。
+"""按 clusters/ 目录里的分组把原图复制成一个新数据集。
 
-    uv run python scripts/export_clusters.py --work-dir runs/simclr_r18
+    uv run python scripts/export_clusters.py --work-dir runs/orgnized_from_r101_k40
 
-产出（目录名默认自动推导，见下）：
+聚类脚本产出的 `clusters/` 里是**软链**，方便人工翻看、调整——可以把图在子目录之间
+挪动、删掉分错的、把 `cluster_03` 改名成 `grease`。这个脚本以整理后的目录为准，
+把每张图的**真实文件**复制出来：
 
 ```
-data/film_r18_cluster_k4/
-├── 0/  ← 簇 0 的原图，文件名保持不变
-├── 1/
-├── 2/
-├── 3/
-└── manifest.json     # 来源 run、每张图的原始路径，便于追溯
+data/orgnized_from_r101_k40/
+├── grease/        ← 子目录名沿用 clusters/ 里的名字（人工整理过的类别名）
+├── mosquito/
+├── normal/
+└── manifest.json  # 每张图的原始路径与所属类别，便于追溯
 ```
 
-**复制真实文件**，不是软链——所以这个目录可以直接拷走或喂给别的工具。
-默认保持原文件名；加 `--prefix-parent` 会在文件名前拼上原父目录名
-（`grease/abc.png` -> `grease_abc.png`），便于导出后仍能一眼看出图片来自哪个原始目录，
-也能避免不同子目录的同名文件在同一个簇里撞车。
+**软链失效也没关系。** 从服务器拷回来的 clusters/ 目录，软链指向的是服务器路径
+（`/home/deep/ModelTrainEval/data/raw/...`），在本机全部失效。脚本会读出链接目标，
+按其中的 `data/` 段重新落到本机 `--source-root` 上；万一还找不到，再用文件名在
+源目录里兜底索引一次。
 
-目录名由三段拼成 `<源目录名>_<骨架标签>_cluster_k<簇数>`，取自聚类产出的
-summary.json：源目录名来自 assignments.csv 里各路径的公共父目录，骨架标签来自
-feature_source（resnet18 -> r18、tiny_conv -> tiny 等）。用 --tag / --out 可以覆盖。
-
-注意标签只反映骨架，不区分 pretrained 与 simclr——同一个骨架的两种跑法会推出同名目录。
-目录非空时脚本会拒绝写入（除非 --overwrite），需要并存时用 `--tag r18ss` 这类手动区分；
-不管叫什么名字，manifest.json 里都记着这批图具体来自哪次 run。
+导出的文件名用**原图的名字**，不带 clusters/ 里的 `0125_` 排序前缀。
+加 `--prefix-parent` 则再拼上原父目录名（`反面纵黑点/abc.png` -> `反面纵黑点_abc.png`），
+便于导出后仍能看出图片来自哪个原始目录。
 """
 
 from __future__ import annotations
 
 import argparse
-import csv
 import json
+import os
 import shutil
 import sys
 from collections import Counter, defaultdict
@@ -44,78 +41,90 @@ from utils import setup_logging  # noqa: E402
 
 logger = None
 
-#: 骨架 -> 目录名里的短标签
-BACKBONE_TAGS = {
-    "resnet18": "r18",
-    "resnet34": "r34",
-    "resnet50": "r50",
-    "mobilenet_v3_small": "mbv3s",
-    "mobilenet_v3_large": "mbv3l",
-    "shufflenet_v2_x1_0": "sfv2",
-    "tiny_conv": "tiny",
-}
+IMAGE_SUFFIXES = (".png", ".jpg", ".jpeg", ".bmp", ".tif", ".tiff", ".webp")
 
 
-def backbone_tag(summary: dict) -> str:
-    """从 summary.json 的 feature_source 推出骨架标签。"""
-    source = summary.get("feature_source") or {}
-    backbone = source.get("backbone") or {}
-    name = backbone.get("arch") or backbone.get("name") or "unknown"
-    return BACKBONE_TAGS.get(name, str(name).replace("_", ""))
+class SourceResolver:
+    """把 clusters/ 里的条目解析成本机上的真实图片路径。
+
+    三种情况依次尝试：
+    1. 条目本身就是真实文件（有人直接把图拷进去了）；
+    2. 软链有效，直接 resolve；
+    3. 软链失效——读出链接目标，按 `data/` 段重新落到本机 `source_root` 上。
+       再不行就用链接目标的文件名在源目录里查索引（索引惰性构建，用不到就不扫盘）。
+    """
+
+    def __init__(self, source_root: Path, marker: str = "data") -> None:
+        self.source_root = source_root.resolve()
+        self.marker = marker
+        self._index: dict[str, Path] | None = None
+
+    def _rebase(self, target: Path) -> Path | None:
+        """把 /home/deep/ModelTrainEval/data/raw/film/x.png 落到本机同名的 data/ 下。"""
+        parts = target.parts
+        if self.marker not in parts:
+            return None
+        candidate = self.source_root.joinpath(*parts[parts.index(self.marker) :])
+        return candidate if candidate.exists() else None
+
+    def _lookup(self, name: str) -> Path | None:
+        if self._index is None:
+            logger.info("建立文件名索引以兜底解析（扫描 %s）…", self.source_root / self.marker)
+            self._index = {
+                path.name: path
+                for path in (self.source_root / self.marker).rglob("*")
+                if path.suffix.lower() in IMAGE_SUFFIXES
+            }
+            logger.info("索引 %d 个文件", len(self._index))
+        return self._index.get(name)
+
+    def resolve(self, entry: Path) -> Path | None:
+        if entry.is_symlink():
+            target = Path(os.readlink(entry))
+            if entry.exists():  # 软链有效
+                return entry.resolve()
+            return self._rebase(target) or self._lookup(target.name)
+        if entry.is_file():
+            return entry.resolve()
+        return None
 
 
-def read_assignments(path: Path) -> list[tuple[Path, int]]:
-    if not path.exists():
-        raise FileNotFoundError(f"找不到 {path}，先跑一次 scripts/cluster_unlabeled.py")
-    rows: list[tuple[Path, int]] = []
-    with path.open(encoding="utf-8") as handle:
-        for line_no, row in enumerate(csv.DictReader(handle), start=2):
-            try:
-                rows.append((Path(row["path"]), int(row["cluster"])))
-            except (KeyError, ValueError) as exc:
-                raise ValueError(f"{path}:{line_no} 解析失败：{row}") from exc
-    if not rows:
-        raise ValueError(f"{path} 里没有任何记录")
-    return rows
+def read_clusters(clusters_dir: Path) -> dict[str, list[Path]]:
+    """扫描 clusters/ 下的每个子目录，子目录名即类别名。"""
+    if not clusters_dir.is_dir():
+        raise FileNotFoundError(f"找不到目录 {clusters_dir}，先跑一次 scripts/cluster_unlabeled.py")
 
-
-def common_root(paths: list[Path]) -> Path:
-    """所有图片的公共父目录，用来推源数据集名。"""
-    parts = [p.resolve().parent.parts for p in paths]
-    shortest = min(len(p) for p in parts)
-    common = []
-    for index in range(shortest):
-        segment = {p[index] for p in parts}
-        if len(segment) != 1:
-            break
-        common.append(segment.pop())
-    return Path(*common) if common else Path(".")
+    groups: dict[str, list[Path]] = {}
+    for category in sorted(p for p in clusters_dir.iterdir() if p.is_dir()):
+        entries = sorted(
+            p
+            for p in category.rglob("*")
+            if (p.is_symlink() or p.is_file()) and p.suffix.lower() in IMAGE_SUFFIXES
+        )
+        if entries:
+            groups[category.name] = entries
+    if not groups:
+        raise ValueError(f"{clusters_dir} 下没有找到任何图片条目")
+    return groups
 
 
 def destination_name(source: Path, prefix_parent: bool = False) -> str:
-    """目标文件名。
+    """目标文件名，用**原图**的名字（不带 clusters/ 里的 NNNN_ 排序前缀）。
 
-    `prefix_parent` 时拼上原父目录名（`grease/abc.png` -> `grease_abc.png`）：
-    导出后目录只剩簇号，原来的来源信息就没了，加前缀能留住它；
-    顺带也化解不同子目录同名文件在同一个簇里撞车的情况。
+    `prefix_parent` 时拼上原父目录名：导出后只剩类别目录，来源信息本来会丢失。
     """
     return f"{source.parent.name}_{source.name}" if prefix_parent else source.name
 
 
-def check_conflicts(groups: dict[int, list[Path]], prefix_parent: bool = False) -> None:
-    """同一个簇里出现同名文件时直接报错——不改名就不能悄悄覆盖。
-
-    按**目标文件名**判重：加了父目录前缀之后原本会撞车的文件可能就不撞了。
-    """
+def check_conflicts(resolved: dict[str, list[Path]], prefix_parent: bool = False) -> None:
+    """同一个类别里出现同名文件时直接报错——不改名就不能悄悄覆盖。"""
     problems = []
-    for cluster, files in sorted(groups.items()):
+    for category, files in sorted(resolved.items()):
         names = Counter(destination_name(f, prefix_parent) for f in files)
         for name, count in names.items():
             if count > 1:
-                sources = [
-                    str(f) for f in files if destination_name(f, prefix_parent) == name
-                ][:3]
-                problems.append(f"  簇 {cluster} 里 {name!r} 出现 {count} 次: {', '.join(sources)} …")
+                sources = [str(f) for f in files if destination_name(f, prefix_parent) == name][:3]
+                problems.append(f"  {category} 里 {name!r} 出现 {count} 次: {', '.join(sources)} …")
     if problems:
         hint = "" if prefix_parent else "可以试试 --prefix-parent 用父目录名区分，或"
         raise ValueError(
@@ -128,72 +137,86 @@ def main() -> int:
     parser = argparse.ArgumentParser(
         description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter
     )
-    parser.add_argument("--work-dir", default=None, help="聚类产出目录（含 assignments.csv）")
-    parser.add_argument("--assignments", default=None, help="直接指定 assignments.csv")
+    parser.add_argument("--work-dir", default=None, help="聚类产出目录（取其中的 clusters/）")
+    parser.add_argument("--clusters", default=None, help="直接指定 clusters 目录")
     parser.add_argument("--out", default=None, help="输出目录；缺省自动推导到 data/ 下")
     parser.add_argument("--data-root", default="data", help="自动推导时的输出根目录，默认 data")
-    parser.add_argument("--tag", default=None, help="覆盖目录名里的骨架标签（如 r18）")
+    parser.add_argument(
+        "--source-root",
+        default=".",
+        help="本机存放原图的仓库根目录，用来重定位失效的软链，默认当前目录",
+    )
     parser.add_argument("--overwrite", action="store_true", help="输出目录已存在时先清空")
     parser.add_argument("--dry-run", action="store_true", help="只打印计划，不真的复制")
     parser.add_argument("--no-manifest", action="store_true", help="不写 manifest.json")
     parser.add_argument(
         "--prefix-parent",
         action="store_true",
-        help="复制时在文件名前拼上原父目录名（grease/abc.png -> grease_abc.png）",
+        help="复制时在文件名前拼上原父目录名（反面纵黑点/abc.png -> 反面纵黑点_abc.png）",
+    )
+    parser.add_argument(
+        "--skip-missing", action="store_true", help="解析不到的条目跳过而不是中止"
     )
     args = parser.parse_args()
 
     logger = setup_logging()
 
-    if not args.work_dir and not args.assignments:
-        logger.error("必须给 --work-dir 或 --assignments 之一")
+    if not args.work_dir and not args.clusters:
+        logger.error("必须给 --work-dir 或 --clusters 之一")
         return 1
     work_dir = Path(args.work_dir) if args.work_dir else None
-    assignments_path = Path(args.assignments) if args.assignments else work_dir / "assignments.csv"
+    clusters_dir = Path(args.clusters) if args.clusters else work_dir / "clusters"
 
     try:
-        rows = read_assignments(assignments_path)
+        groups = read_clusters(clusters_dir)
     except (FileNotFoundError, ValueError) as exc:
         logger.error("%s", exc)
         return 1
 
-    summary_path = (work_dir or assignments_path.parent) / "summary.json"
-    summary = json.loads(summary_path.read_text(encoding="utf-8")) if summary_path.exists() else {}
-
-    groups: dict[int, list[Path]] = defaultdict(list)
-    for path, cluster in rows:
-        groups[cluster].append(path)
-
-    source_root = common_root([p for p, _ in rows])
-    num_clusters = int(summary.get("num_clusters") or (max(groups) + 1))
-    tag = args.tag or backbone_tag(summary)
     out_dir = (
-        Path(args.out)
-        if args.out
-        else Path(args.data_root) / f"{source_root.name}_{tag}_cluster_k{num_clusters}"
+        Path(args.out) if args.out else Path(args.data_root) / clusters_dir.resolve().parent.name
     )
-
-    logger.info("来源: %s（%d 张，%d 个簇）", assignments_path, len(rows), len(groups))
-    logger.info("源数据集: %s | 骨架标签: %s", source_root, tag)
+    total = sum(len(v) for v in groups.values())
+    logger.info("来源: %s（%d 张，%d 个类别）", clusters_dir, total, len(groups))
     logger.info("输出目录: %s", out_dir)
-    if args.prefix_parent:
-        example = rows[0][0]
-        logger.info(
-            "文件名加父目录前缀：%s -> %s", example.name, destination_name(example, True)
-        )
 
-    missing = [p for p, _ in rows if not p.exists()]
-    if missing:
-        logger.error("有 %d 个源文件不存在，例如 %s", len(missing), missing[0])
-        return 1
+    resolver = SourceResolver(Path(args.source_root))
+    resolved: dict[str, list[Path]] = defaultdict(list)
+    unresolved: list[Path] = []
+    for category, entries in groups.items():
+        for entry in entries:
+            source = resolver.resolve(entry)
+            if source is None:
+                unresolved.append(entry)
+            else:
+                resolved[category].append(source)
+
+    if unresolved:
+        logger.error("有 %d 个条目在本机找不到对应的原图，例如：", len(unresolved))
+        for entry in unresolved[:5]:
+            target = os.readlink(entry) if entry.is_symlink() else "(不是软链)"
+            logger.error("    %s -> %s", entry, target)
+        if not args.skip_missing:
+            logger.error(
+                "确认 --source-root 指向存放 data/ 的目录（当前 %s）；"
+                "确实要忽略这些条目请加 --skip-missing",
+                Path(args.source_root).resolve(),
+            )
+            return 1
+        logger.warning("--skip-missing：跳过上述 %d 个条目", len(unresolved))
+
     try:
-        check_conflicts(groups, args.prefix_parent)
+        check_conflicts(resolved, args.prefix_parent)
     except ValueError as exc:
         logger.error("%s", exc)
         return 1
 
-    for cluster in sorted(groups):
-        logger.info("  簇 %d -> %s/%d/  共 %d 张", cluster, out_dir.name, cluster, len(groups[cluster]))
+    for category in sorted(resolved):
+        logger.info("  %-14s -> %s/%s/  共 %d 张", category, out_dir.name, category,
+                    len(resolved[category]))
+    if args.prefix_parent:
+        example = next(iter(next(iter(resolved.values()))))
+        logger.info("文件名加父目录前缀：%s -> %s", example.name, destination_name(example, True))
     if args.dry_run:
         logger.info("--dry-run：未写入任何文件")
         return 0
@@ -208,30 +231,33 @@ def main() -> int:
     copied = 0
     total_bytes = 0
     manifest: dict[str, list[dict]] = {}
-    for cluster in sorted(groups):
-        target = out_dir / str(cluster)
-        target.mkdir(parents=True, exist_ok=True)
+    for category in sorted(resolved):
+        target_dir = out_dir / category
+        target_dir.mkdir(parents=True, exist_ok=True)
         entries = []
-        for source in sorted(groups[cluster]):
+        for source in sorted(resolved[category]):
             name = destination_name(source, args.prefix_parent)
-            destination = target / name
-            shutil.copy2(source, destination)   # copy2 连同修改时间一起复制
+            destination = target_dir / name
+            shutil.copy2(source, destination)  # copy2 连同修改时间一起复制
             total_bytes += destination.stat().st_size
             copied += 1
             entries.append({"file": name, "source": str(source)})
-        manifest[str(cluster)] = entries
-        logger.info("簇 %d 完成：%d 张", cluster, len(entries))
+        manifest[category] = entries
+        logger.info("%-14s 完成：%d 张", category, len(entries))
 
     if not args.no_manifest:
+        summary_path = (work_dir or clusters_dir.parent) / "summary.json"
+        summary = json.loads(summary_path.read_text(encoding="utf-8")) if summary_path.exists() else {}
         (out_dir / "manifest.json").write_text(
             json.dumps(
                 {
-                    "source_root": str(source_root),
-                    "assignments": str(assignments_path.resolve()),
-                    "num_clusters": num_clusters,
+                    "clusters_dir": str(clusters_dir.resolve()),
+                    "source_root": str(Path(args.source_root).resolve()),
+                    "categories": sorted(manifest),
                     "prefix_parent": args.prefix_parent,
+                    "skipped": [str(p) for p in unresolved],
                     "feature_source": summary.get("feature_source"),
-                    "cluster_sizes": {k: len(v) for k, v in sorted(manifest.items())},
+                    "category_sizes": {k: len(v) for k, v in sorted(manifest.items())},
                     "files": manifest,
                 },
                 ensure_ascii=False,

tests/test_export_clusters.py

@@ -1,6 +1,5 @@
-"""按聚类结果导出数据集。"""
+"""按 clusters/ 目录导出数据集。"""
 
-import csv
 import filecmp
 import json
 import sys
@@ -18,38 +17,37 @@ import export_clusters as ec  # noqa: E402
 
 
 @pytest.fixture
-def cluster_run(tmp_path):
-    """造一份源图片 + assignments.csv + summary.json。"""
-    source = tmp_path / "film"
-    (source / "grease").mkdir(parents=True)
-    (source / "wrinkle").mkdir(parents=True)
+def curated(tmp_path):
+    """造出「源图在本机 + clusters/ 里全是失效软链」的现场。
 
+    模拟从服务器拷回来的 clusters/：软链指向 /server/proj/data/raw/...，本机没有该路径，
+    但同样的相对路径在 tmp_path/data/raw/ 下存在。
+    """
     rng = np.random.default_rng(0)
-    files = []
-    for folder, count in (("grease", 3), ("wrinkle", 2)):
+    sources = {}
+    for dataset, folder, count in (("film", "grease", 3), ("film", "wrinkle", 2), ("blue", "", 2)):
+        relative = Path("data/raw") / dataset / folder if folder else Path("data/raw") / dataset
+        directory = tmp_path / relative
+        directory.mkdir(parents=True, exist_ok=True)
         for i in range(count):
-            path = source / folder / f"{folder}_{i}.png"
-            Image.fromarray(rng.integers(0, 255, (20, 30, 3), dtype=np.uint8)).save(path)
-            files.append(path)
+            name = f"{dataset}{folder}{i}.png"
+            path = directory / name
+            Image.fromarray(rng.integers(0, 255, (12, 16, 3), dtype=np.uint8)).save(path)
+            sources[path] = str(Path("/server/proj") / relative / name)
 
-    work_dir = tmp_path / "run"
-    work_dir.mkdir()
-    with (work_dir / "assignments.csv").open("w", newline="", encoding="utf-8") as handle:
-        writer = csv.writer(handle)
-        writer.writerow(["path", "cluster", "distance_to_centroid", "source_dir", "width", "height"])
-        for index, path in enumerate(files):
-            writer.writerow([str(path), index % 2, "0.1", path.parent.name, 30, 20])
-    (work_dir / "summary.json").write_text(
-        json.dumps({
-            "num_clusters": 2,
-            "feature_source": {
-                "method": "simclr",
-                "backbone": {"name": "torchvision", "arch": "resnet18"},
-            },
-        }),
-        encoding="utf-8",
+    clusters = tmp_path / "run" / "clusters"
+    categories = {"grease": [], "normal": []}
+    for index, (local, server) in enumerate(sorted(sources.items())):
+        category = "grease" if index % 2 == 0 else "normal"
+        (clusters / category).mkdir(parents=True, exist_ok=True)
+        link = clusters / category / f"{index:04d}_{local.name}"
+        link.symlink_to(server)              # 指向服务器路径，本机必然失效
+        assert not link.exists()
+        categories[category].append(local)
+    (tmp_path / "run" / "summary.json").write_text(
+        json.dumps({"feature_source": {"backbone": {"arch": "resnet101"}}}), encoding="utf-8"
     )
-    return source, work_dir, files
+    return tmp_path, clusters, categories
 
 
 def run(argv, monkeypatch):
@@ -57,167 +55,148 @@ def run(argv, monkeypatch):
     return ec.main()
 
 
-def test_exports_real_files_with_original_names(cluster_run, tmp_path, monkeypatch):
-    source, work_dir, files = cluster_run
-    data_root = tmp_path / "data"
+def test_broken_symlinks_are_relocated_to_local_source(curated, tmp_path, monkeypatch):
+    """从服务器拷回来的软链全部失效，仍应按 data/ 段落到本机原图上。"""
+    root, clusters, categories = curated
+    out = tmp_path / "out"
 
-    assert run(["--work-dir", str(work_dir), "--data-root", str(data_root)], monkeypatch) == 0
-
-    out = data_root / "film_r18_cluster_k2"  # <源目录名>_<骨架标签>_cluster_k<簇数>
-    assert out.is_dir()
-    assert sorted(p.name for p in out.iterdir() if p.is_dir()) == ["0", "1"]
-
-    exported = sorted(p for p in out.rglob("*.png"))
-    assert len(exported) == len(files)
-    for path in exported:
-        assert not path.is_symlink(), "必须是真实文件，不是软链"
-        assert path.is_file()
-    # 文件名保持不变、内容逐字节一致
-    by_name = {p.name: p for p in exported}
-    for original in files:
-        assert original.name in by_name
-        assert filecmp.cmp(original, by_name[original.name], shallow=False)
-
-
-def test_prefix_parent_prepends_source_folder(cluster_run, tmp_path, monkeypatch):
-    """--prefix-parent 把原父目录名拼到文件名前，导出后仍能看出图来自哪个目录。"""
-    _, work_dir, files = cluster_run
-    data_root = tmp_path / "data"
-
-    assert run(["--work-dir", str(work_dir), "--data-root", str(data_root), "--prefix-parent"],
+    assert run(["--clusters", str(clusters), "--out", str(out), "--source-root", str(root)],
                monkeypatch) == 0
 
-    out = data_root / "film_r18_cluster_k2"
-    exported = {p.name for p in out.rglob("*.png")}
-    assert exported == {f"{f.parent.name}_{f.name}" for f in files}
-    assert all(name.startswith(("grease_", "wrinkle_")) for name in exported)
+    for category, sources in categories.items():
+        exported = sorted((out / category).glob("*.png"))
+        assert len(exported) == len(sources)
+        for path in exported:
+            assert not path.is_symlink(), "必须是真实文件"
+        by_name = {p.name: p for p in exported}
+        for source in sources:
+            assert filecmp.cmp(source, by_name[source.name], shallow=False)
 
-    # 仍然是真实文件、内容不变
-    for path in out.rglob("*.png"):
-        assert not path.is_symlink() and path.is_file()
+
+def test_category_names_are_preserved(curated, tmp_path, monkeypatch):
+    """clusters/ 里的子目录名是人工整理出来的类别，导出后要原样保留。"""
+    root, clusters, categories = curated
+    out = tmp_path / "out"
+    run(["--clusters", str(clusters), "--out", str(out), "--source-root", str(root)], monkeypatch)
+
+    assert sorted(p.name for p in out.iterdir() if p.is_dir()) == sorted(categories)
+
+
+def test_rank_prefix_is_stripped(curated, tmp_path, monkeypatch):
+    """clusters/ 里的文件名带 0000_ 排序前缀，导出用原图名。"""
+    root, clusters, _ = curated
+    out = tmp_path / "out"
+    run(["--clusters", str(clusters), "--out", str(out), "--source-root", str(root)], monkeypatch)
+
+    assert not any(p.name[:4].isdigit() and p.name[4] == "_" for p in out.rglob("*.png"))
+
+
+def test_prefix_parent_resolves_cross_dataset_collisions(curated, tmp_path, monkeypatch):
+    """不同数据集用同样的数字文件名（blue/7.png 与 pearlescent/7.png）时会撞车，
+    加父目录前缀就能共存——这正是真实数据里 blue/uv/pearlescent 的情况。"""
+    root, clusters, _ = curated
+    twins = []
+    for dataset in ("blue", "pearlescent"):
+        directory = root / "data" / "raw" / dataset
+        directory.mkdir(parents=True, exist_ok=True)
+        path = directory / "7.png"
+        Image.fromarray(np.full((12, 16, 3), 7, dtype=np.uint8)).save(path)
+        link = clusters / "normal" / f"05{len(twins)}_7.png"
+        link.symlink_to(f"/server/proj/data/raw/{dataset}/7.png")
+        twins.append(path)
+
+    out = tmp_path / "out"
+    argv = ["--clusters", str(clusters), "--out", str(out), "--source-root", str(root)]
+
+    assert run(argv, monkeypatch) == 1                        # 同名撞车
+    assert run([*argv, "--prefix-parent"], monkeypatch) == 0  # 用父目录名区分
+
+    names = {p.name for p in out.rglob("*.png")}
+    assert {"blue_7.png", "pearlescent_7.png"} <= names
+
+
+def test_real_files_in_clusters_are_used_directly(curated, tmp_path, monkeypatch):
+    """有人直接把真实图片拷进 clusters/ 时也要能用。"""
+    root, clusters, _ = curated
+    extra = clusters / "normal" / "9999_real.png"
+    Image.fromarray(np.zeros((10, 10, 3), dtype=np.uint8)).save(extra)
+
+    out = tmp_path / "out"
+    assert run(["--clusters", str(clusters), "--out", str(out), "--source-root", str(root),
+                "--prefix-parent"], monkeypatch) == 0
+    assert (out / "normal" / "normal_9999_real.png").is_file()
+
+
+def test_unresolvable_entries_abort_unless_skipped(curated, tmp_path, monkeypatch):
+    root, clusters, _ = curated
+    orphan = clusters / "normal" / "0099_gone.png"
+    orphan.symlink_to("/server/proj/data/raw/film/grease/does_not_exist.png")
+
+    out = tmp_path / "out"
+    argv = ["--clusters", str(clusters), "--out", str(out), "--source-root", str(root),
+            "--prefix-parent"]
+    assert run(argv, monkeypatch) == 1
+    assert run([*argv, "--skip-missing"], monkeypatch) == 0
 
     manifest = json.loads((out / "manifest.json").read_text("utf-8"))
+    assert len(manifest["skipped"]) == 1
+
+
+def test_manifest_records_sources_and_categories(curated, tmp_path, monkeypatch):
+    root, clusters, categories = curated
+    out = tmp_path / "out"
+    run(["--clusters", str(clusters), "--out", str(out), "--source-root", str(root),
+         "--prefix-parent"], monkeypatch)
+
+    manifest = json.loads((out / "manifest.json").read_text("utf-8"))
+    assert sorted(manifest["categories"]) == sorted(categories)
     assert manifest["prefix_parent"] is True
+    assert manifest["feature_source"]["backbone"]["arch"] == "resnet101"
+    total = sum(manifest["category_sizes"].values())
+    assert total == sum(len(v) for v in categories.values())
     for entries in manifest["files"].values():
         for entry in entries:
-            source = Path(entry["source"])
-            assert entry["file"] == f"{source.parent.name}_{source.name}"
+            assert Path(entry["source"]).is_file()
 
 
-def test_without_prefix_names_are_unchanged(cluster_run, tmp_path, monkeypatch):
-    _, work_dir, files = cluster_run
-    data_root = tmp_path / "data"
-    run(["--work-dir", str(work_dir), "--data-root", str(data_root)], monkeypatch)
+def test_dry_run_and_overwrite_guard(curated, tmp_path, monkeypatch):
+    root, clusters, _ = curated
+    out = tmp_path / "out"
+    argv = ["--clusters", str(clusters), "--out", str(out), "--source-root", str(root),
+            "--prefix-parent"]
 
-    exported = {p.name for p in (data_root / "film_r18_cluster_k2").rglob("*.png")}
-    assert exported == {f.name for f in files}
+    assert run([*argv, "--dry-run"], monkeypatch) == 0
+    assert not out.exists()
+
+    assert run(argv, monkeypatch) == 0
+    assert run(argv, monkeypatch) == 1                       # 已存在且非空
+    assert run([*argv, "--overwrite"], monkeypatch) == 0
 
 
-def test_prefix_parent_resolves_same_name_across_folders(cluster_run, tmp_path, monkeypatch):
-    """不同子目录的同名文件，不加前缀会撞车报错，加了前缀就能共存。"""
-    source, work_dir, _ = cluster_run
-    twin = source / "wrinkle" / "grease_0.png"      # 与 grease/grease_0.png 同名
-    Image.fromarray(np.zeros((20, 30, 3), dtype=np.uint8)).save(twin)
+def test_default_out_dir_uses_work_dir_name(curated, tmp_path, monkeypatch):
+    root, clusters, _ = curated
+    data_root = tmp_path / "exported"
+    assert run(["--work-dir", str(clusters.parent), "--data-root", str(data_root),
+                "--source-root", str(root), "--prefix-parent"], monkeypatch) == 0
+    assert (data_root / clusters.parent.name).is_dir()
 
-    rows = list(csv.DictReader((work_dir / "assignments.csv").open(encoding="utf-8")))
-    with (work_dir / "assignments.csv").open("w", newline="", encoding="utf-8") as handle:
-        writer = csv.DictWriter(handle, fieldnames=list(rows[0]))
-        writer.writeheader()
-        writer.writerows(rows)
-        writer.writerow({**rows[0], "path": str(twin), "cluster": rows[0]["cluster"]})
 
-    data_root = tmp_path / "data"
-    argv = ["--work-dir", str(work_dir), "--data-root", str(data_root)]
-    assert run(argv, monkeypatch) == 1                       # 不加前缀：撞车
-    assert run([*argv, "--prefix-parent"], monkeypatch) == 0  # 加前缀：共存
+def test_resolver_falls_back_to_basename_index(curated, tmp_path):
+    """链接目标里没有 data/ 段时，用文件名在源目录里兜底查找。"""
+    root, clusters, _ = curated
+    resolver = ec.SourceResolver(root)
+    ec.logger = ec.setup_logging()
 
-    out = data_root / "film_r18_cluster_k2"
-    assert {"grease_grease_0.png", "wrinkle_grease_0.png"} <= {p.name for p in out.rglob("*.png")}
+    odd = clusters / "grease" / "0100_odd.png"
+    target = sorted((root / "data" / "raw" / "film" / "grease").glob("*.png"))[0]
+    odd.symlink_to(f"/elsewhere/{target.name}")   # 路径里没有 data/ 段
+    assert resolver.resolve(odd) == target.resolve()
+
+
+def test_missing_clusters_dir_is_reported(tmp_path, monkeypatch):
+    assert run(["--clusters", str(tmp_path / "nope"), "--out", str(tmp_path / "o")], monkeypatch) == 1
 
 
 def test_destination_name_helper():
     assert ec.destination_name(Path("data/raw/film/grease/abc.png")) == "abc.png"
     assert ec.destination_name(Path("data/raw/film/grease/abc.png"), True) == "grease_abc.png"
-
-
-def test_cluster_dirs_are_numbered_from_zero(cluster_run, tmp_path, monkeypatch):
-    _, work_dir, files = cluster_run
-    data_root = tmp_path / "data"
-    run(["--work-dir", str(work_dir), "--data-root", str(data_root)], monkeypatch)
-
-    out = data_root / "film_r18_cluster_k2"
-    assert (out / "0").is_dir() and (out / "1").is_dir()
-    assert len(list((out / "0").glob("*.png"))) + len(list((out / "1").glob("*.png"))) == len(files)
-
-
-def test_manifest_records_provenance(cluster_run, tmp_path, monkeypatch):
-    _, work_dir, files = cluster_run
-    data_root = tmp_path / "data"
-    run(["--work-dir", str(work_dir), "--data-root", str(data_root)], monkeypatch)
-
-    manifest = json.loads((data_root / "film_r18_cluster_k2" / "manifest.json").read_text("utf-8"))
-    assert manifest["num_clusters"] == 2
-    assert manifest["feature_source"]["backbone"]["arch"] == "resnet18"
-    assert sum(manifest["cluster_sizes"].values()) == len(files)
-    # 原图路径可追溯
-    recorded = {e["source"] for entries in manifest["files"].values() for e in entries}
-    assert recorded == {str(f) for f in files}
-
-
-def test_tag_and_out_overrides(cluster_run, tmp_path, monkeypatch):
-    _, work_dir, _ = cluster_run
-    data_root = tmp_path / "data"
-
-    run(["--work-dir", str(work_dir), "--data-root", str(data_root), "--tag", "r18ss"], monkeypatch)
-    assert (data_root / "film_r18ss_cluster_k2").is_dir()
-
-    explicit = tmp_path / "somewhere" / "my_dataset"
-    run(["--work-dir", str(work_dir), "--out", str(explicit)], monkeypatch)
-    assert explicit.is_dir()
-
-
-def test_dry_run_writes_nothing(cluster_run, tmp_path, monkeypatch):
-    _, work_dir, _ = cluster_run
-    data_root = tmp_path / "data"
-    assert run(["--work-dir", str(work_dir), "--data-root", str(data_root), "--dry-run"],
-               monkeypatch) == 0
-    assert not data_root.exists()
-
-
-def test_refuses_to_overwrite_unless_asked(cluster_run, tmp_path, monkeypatch):
-    _, work_dir, _ = cluster_run
-    data_root = tmp_path / "data"
-    argv = ["--work-dir", str(work_dir), "--data-root", str(data_root)]
-
-    assert run(argv, monkeypatch) == 0
-    assert run(argv, monkeypatch) == 1                      # 已存在且非空 -> 拒绝
-    assert run([*argv, "--overwrite"], monkeypatch) == 0     # 明确要求才覆盖
-
-
-def test_duplicate_basenames_in_one_cluster_are_rejected(cluster_run, tmp_path, monkeypatch):
-    """要求保留原文件名，同簇重名就会互相覆盖，必须报错而不是悄悄丢文件。"""
-    source, work_dir, _ = cluster_run
-    twin = source / "wrinkle" / "grease_0.png"   # 与 grease/grease_0.png 同名
-    Image.fromarray(np.zeros((20, 30, 3), dtype=np.uint8)).save(twin)
-
-    rows = list(csv.DictReader((work_dir / "assignments.csv").open(encoding="utf-8")))
-    with (work_dir / "assignments.csv").open("w", newline="", encoding="utf-8") as handle:
-        writer = csv.DictWriter(handle, fieldnames=list(rows[0]))
-        writer.writeheader()
-        writer.writerows(rows)
-        writer.writerow({**rows[0], "path": str(twin), "cluster": rows[0]["cluster"]})
-
-    assert run(["--work-dir", str(work_dir), "--data-root", str(tmp_path / "data")], monkeypatch) == 1
-
-
-def test_missing_source_file_is_reported(cluster_run, tmp_path, monkeypatch):
-    _, work_dir, files = cluster_run
-    files[0].unlink()
-    assert run(["--work-dir", str(work_dir), "--data-root", str(tmp_path / "data")], monkeypatch) == 1
-
-
-def test_backbone_tag_mapping():
-    assert ec.backbone_tag({"feature_source": {"backbone": {"arch": "resnet18"}}}) == "r18"
-    assert ec.backbone_tag({"feature_source": {"backbone": {"name": "tiny_conv"}}}) == "tiny"
-    assert ec.backbone_tag({"feature_source": {"backbone": {"arch": "shufflenet_v2_x1_0"}}}) == "sfv2"
-    assert ec.backbone_tag({}) == "unknown"