Apply suggestions from code review

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: DamianSzwichtenberg

assets/versions.sh

@@ -12,7 +12,7 @@ PYTORCH_VERSION="2.9.0"
 # ROCm/XPU builds vLLM from source (no prebuilt ROCm/XPU wheels available)
 VLLM_ROCM_VERSION="v0.10.0"
 VLLM_XPU_VERSION="v0.13.0"
-# IPEX wheels shipped with vLLM has hard python version requirement
+# IPEX wheels shipped with vLLM have hard python version requirement
 IPEX_PYTHON_VERSION="3.12"
 TORCHSTORE_BRANCH="no-monarch-2026.01.05"
 # ROCm/XPU builds these from source (no ROCm/XPU wheels); CUDA uses pyproject pins.

scripts/install_xpu.sh

@@ -47,6 +47,10 @@ if [ -z "${MONARCH_VERSION:-}" ]; then
     log_error "MONARCH_VERSION not set in $VERSIONS_FILE"
     exit 1
 fi
+if [ -z "${IPEX_PYTHON_VERSION:-}" ]; then
+    log_error "IPEX_PYTHON_VERSION not set in $VERSIONS_FILE"
+    exit 1
+fi
 
 # Defaults (override via environment variables)
 FORGE_DEPS_DIR="${FORGE_DEPS_DIR:-$HOME/.cache/torchforge}"
@@ -294,7 +298,7 @@ install_torchstore() {
 }
 
 install_torchtitan() {
-    log_info "Installing torchtitan from tag ${TORCHTITAN_XPU_COMMIT}"
+    log_info "Installing torchtitan from commit ${TORCHTITAN_XPU_COMMIT}"
     python -m pip install "git+https://github.com/pytorch/torchtitan.git@${TORCHTITAN_XPU_COMMIT}"
 }
 
@@ -471,7 +475,7 @@ main() {
     install_system_packages "$USE_SUDO"
     setup_xpu_env
 
-    # vLLM install PyTorch + IPEX + creates constraints
+    # vLLM installs PyTorch + IPEX + creates constraints
     install_vllm_xpu
 
     # Everything below is protected by PIP_CONSTRAINT