wsl2 fix

cli/wake_word_sample_trainer

@@ -51,6 +51,24 @@ fi
 # shellcheck source=/dev/null
 source "${DATA_DIR}/.venv/bin/activate"
 
+# --- WSL2 GPU visibility fix (venv sometimes doesn't inherit WSL driver path) ---
+# Keep a copy so we can restore/preserve on fallback if desired.
+ORIG_XLA_FLAGS="${XLA_FLAGS:-}"
+
+if [ -d /usr/lib/wsl/lib ]; then
+  export LD_LIBRARY_PATH="/usr/lib/wsl/lib:${LD_LIBRARY_PATH:-}"
+  echo "ℹ️  WSL2 detected: LD_LIBRARY_PATH+=/usr/lib/wsl/lib"
+
+  # Blackwell / PTXAS workaround: only apply on WSL *and* only if user didn't set XLA_FLAGS
+  if [ -z "${XLA_FLAGS:-}" ]; then
+    export XLA_FLAGS="--xla_gpu_unsafe_fallback_to_driver_on_ptxas_not_found"
+    echo "ℹ️  WSL2: setting XLA_FLAGS=${XLA_FLAGS}"
+  else
+    echo "ℹ️  Using user-provided XLA_FLAGS=${XLA_FLAGS}"
+  fi
+fi
+# -----------------------------------------------------------------------------
+
 check_directories() {
     for d in "$@" ; do
         [ -d "$d" ] || { echo "ERROR: Directory $d not found" >&2 ; exit 1 ; }
@@ -162,7 +180,6 @@ if [ "${HAS_PERSONAL}" = "true" ]; then
   type: mmap
 EOF
 )"
-
   perl -0777 -i -pe "s#__PERSONAL_FEATURE_MARKER__#${personal_block}#g" "${YAML_PATH}"
 else
   sed -i -e "/__PERSONAL_FEATURE_MARKER__/d" "${YAML_PATH}"
@@ -241,7 +258,6 @@ run_attempt() {
 # --------- ENV (keep compatible; DO NOT add unsupported XLA flags) ----------
 export TF_CPP_MIN_LOG_LEVEL="${TF_CPP_MIN_LOG_LEVEL:-2}"
 export TF_XLA_FLAGS="${TF_XLA_FLAGS:---tf_xla_auto_jit=0}"
-unset XLA_FLAGS
 
 export NVIDIA_TF32_OVERRIDE="${NVIDIA_TF32_OVERRIDE:-1}"
 export TF_FORCE_GPU_ALLOW_GROWTH="${TF_FORCE_GPU_ALLOW_GROWTH:-true}"
@@ -269,7 +285,13 @@ else
 
     # CPU attempt should not inherit GPU/XLA runtime knobs
     unset TF_XLA_FLAGS
-    unset XLA_FLAGS
+
+    # Optional: clear XLA_FLAGS for CPU (usually irrelevant). If user had set it, restore.
+    if [ -n "${ORIG_XLA_FLAGS}" ]; then
+      export XLA_FLAGS="${ORIG_XLA_FLAGS}"
+    else
+      unset XLA_FLAGS
+    fi
 
     if run_attempt "Attempt 2/2: CPU fallback (CUDA_VISIBLE_DEVICES='')" ; then
       echo "✅ Training complete (CPU fallback)."