Make held-out manifests portable

prepare_inference_manifest.py

@@ -5,6 +5,7 @@ from __future__ import annotations
 import argparse
 import hashlib
 import json
+import os
 from pathlib import Path
 
 from validate_capture_manifest import validate_capture_manifest
@@ -24,7 +25,7 @@ def prepare_inference_manifest(source_path: str | Path, destination: str | Path)
     prepared = dict(manifest)
     prepared["views"] = train
     prepared["evaluation"] = {
-        "source_manifest": str(source),
+        "source_manifest": Path(os.path.relpath(source, target.parent)).as_posix(),
         "source_manifest_sha256": hashlib.sha256(source.read_bytes()).hexdigest(),
         "excluded_held_out_view_ids": [view["id"] for view in held_out],
         "held_out_view_count": len(held_out),