Fix basicsr/realesrgan/gfpgan build: move to runtime --no-build-isolation install (setup.py imports torch)

app.py

@@ -29,13 +29,20 @@ from pathlib import Path
 # ──────────────────────────────────────────────────────────────────────────────
 _RUNTIME_PKG_MARKER = Path("/tmp/.runtime_pkgs_installed")
 
-# 1. Packages requiring --no-build-isolation (chumpy transitive dep via hmr2/skel)
-#    Do NOT list chumpy explicitly — hmr2 declares it as a direct-ref dep; pip
-#    would see two conflicting direct refs. Let hmr2 pull chumpy as a transitive
-#    dep; --no-build-isolation propagates to all deps in the install invocation.
+# 1. Packages requiring --no-build-isolation
+#    - hmr2/skel: declare `chumpy @ git+...` direct-ref dep; chumpy's setup.py does
+#      `from pip._internal.req import parse_requirements` which fails in isolated builds.
+#    - basicsr/realesrgan/gfpgan/facexlib/face-alignment: setup.py imports torch to read
+#      __version__, which fails when torch is not yet present in the isolated build env.
+#    Do NOT list chumpy explicitly — hmr2 pulls it as a transitive dep.
 _NO_ISOLATION_PACKAGES = [
     "hmr2 @ git+https://github.com/shubham-goel/4D-Humans.git@efe18deff163b29dff87ddbd575fa29b716a356c",
     "skel @ git+https://github.com/MarilynKeller/SKEL.git@c32cf16581295bff19399379efe5b776d707cd95",
+    "basicsr",
+    "realesrgan",
+    "gfpgan",
+    "facexlib",
+    "face-alignment",
 ]
 
 # 2. Packages with over-pinned deps that conflict with our stack; install --no-deps

requirements.txt

@@ -1,4 +1,4 @@
-# HuggingFace ZeroGPU Space — Gradio SDK  [cache-bust: 4]
+# HuggingFace ZeroGPU Space — Gradio SDK  [cache-bust: 5]
 spaces
 numpy>=2
 
@@ -47,11 +47,9 @@ kornia
 # Face enhancement
 insightface
 onnxruntime-gpu
-basicsr
-realesrgan
-gfpgan
-facexlib
-face-alignment
+# basicsr/realesrgan/gfpgan/facexlib/face-alignment: installed at runtime in app.py
+# with --no-build-isolation (their setup.py imports torch at build time, which fails
+# in pip's isolated build env where torch is not yet installed)
 
 # Surface enhancement
 # stablenormal: installed at runtime with --no-deps (it pins diffusers==0.28.0)