fix: use venv_t5_root() so .venv_t5 respects UNSLOTH_STUDIO_HOME

studio/backend/core/export/worker.py

@@ -44,9 +44,8 @@ def _activate_transformers_version(model_name: str) -> None:
 
     resolved = _resolve_base_model(model_name)
     if needs_transformers_5(resolved):
-        venv_t5 = os.path.join(
-            os.path.expanduser("~"), ".unsloth", "studio", ".venv_t5"
-        )
+        from utils.paths.storage_roots import venv_t5_root
+        venv_t5 = str(venv_t5_root())
         if os.path.isdir(venv_t5):
             sys.path.insert(0, venv_t5)
             logger.info("Activated transformers 5.x from %s", venv_t5)

studio/backend/core/inference/worker.py

@@ -46,9 +46,8 @@ def _activate_transformers_version(model_name: str) -> None:
 
     resolved = _resolve_base_model(model_name)
     if needs_transformers_5(resolved):
-        venv_t5 = os.path.join(
-            os.path.expanduser("~"), ".unsloth", "studio", ".venv_t5"
-        )
+        from utils.paths.storage_roots import venv_t5_root
+        venv_t5 = str(venv_t5_root())
         if os.path.isdir(venv_t5):
             sys.path.insert(0, venv_t5)
             logger.info("Activated transformers 5.x from %s", venv_t5)

studio/backend/core/training/worker.py

@@ -40,9 +40,8 @@ def _activate_transformers_version(model_name: str) -> None:
 
     resolved = _resolve_base_model(model_name)
     if needs_transformers_5(resolved):
-        venv_t5 = os.path.join(
-            os.path.expanduser("~"), ".unsloth", "studio", ".venv_t5"
-        )
+        from utils.paths.storage_roots import venv_t5_root
+        venv_t5 = str(venv_t5_root())
         if os.path.isdir(venv_t5):
             sys.path.insert(0, venv_t5)
             logger.info("Activated transformers 5.x from %s", venv_t5)

studio/backend/utils/models/model_config.py

@@ -427,7 +427,8 @@ _VLM_MODEL_TYPES = {
 }
 
 # Pre-computed .venv_t5 path and backend dir for subprocess version switching.
-_VENV_T5_DIR = str(Path.home() / ".unsloth" / "studio" / ".venv_t5")
+from utils.paths.storage_roots import venv_t5_root
+_VENV_T5_DIR = str(venv_t5_root())
 _BACKEND_DIR = str(Path(__file__).resolve().parent.parent.parent)
 
 # Inline script executed in a subprocess with transformers 5.x activated.

studio/backend/utils/paths/__init__.py

@@ -8,6 +8,7 @@ Path utilities for model and dataset handling
 from .path_utils import normalize_path, is_local_path, is_model_cached, get_cache_path
 from .storage_roots import (
     studio_root,
+    venv_t5_root,
     assets_root,
     datasets_root,
     dataset_uploads_root,
@@ -36,6 +37,7 @@ __all__ = [
     "is_model_cached",
     "get_cache_path",
     "studio_root",
+    "venv_t5_root",
     "assets_root",
     "datasets_root",
     "dataset_uploads_root",

studio/backend/utils/paths/storage_roots.py

@@ -15,6 +15,11 @@ def studio_root() -> Path:
     return Path.home() / ".unsloth" / "studio"
 
 
+def venv_t5_root() -> Path:
+    """Pre-installed transformers 5.x directory, respects UNSLOTH_STUDIO_HOME."""
+    return studio_root() / ".venv_t5"
+
+
 def cache_root() -> Path:
     """Central cache directory for all studio downloads (models, datasets, etc.)."""
     return studio_root() / "cache"

studio/backend/utils/transformers_version.py

@@ -61,7 +61,8 @@ TRANSFORMERS_5_VERSION = "5.3.0"
 TRANSFORMERS_DEFAULT_VERSION = "4.57.1"
 
 # Pre-installed directory for transformers 5.x — created by setup.sh / setup.ps1
-_VENV_T5_DIR = str(Path.home() / ".unsloth" / "studio" / ".venv_t5")
+from utils.paths.storage_roots import venv_t5_root
+_VENV_T5_DIR = str(venv_t5_root())
 
 
 def _resolve_base_model(model_name: str) -> str:

studio/setup.sh

@@ -230,6 +230,7 @@ else
     # Local: create venv under studio home (shared location, not in repo)
     # Configurable via UNSLOTH_STUDIO_HOME; defaults to ~/.unsloth/studio
     STUDIO_HOME="${UNSLOTH_STUDIO_HOME:-$HOME/.unsloth/studio}"
+    echo "   Studio home: $STUDIO_HOME"
     VENV_DIR="$STUDIO_HOME/.venv"
     VENV_T5_DIR="$STUDIO_HOME/.venv_t5"
     mkdir -p "$STUDIO_HOME"