ptx fix

cli/setup_python_venv

@@ -72,7 +72,14 @@ if ${GPU} ; then
 fi
 
 VENV="${DATA_DIR}/.venv"
-[ -n "${VIRTUAL_ENV}" ] && deactivate
+if [ -n "${VIRTUAL_ENV:-}" ] && [ "${VIRTUAL_ENV}" != "${VENV}" ] ; then
+    if command -v deactivate >/dev/null 2>&1 ; then
+        deactivate || :
+    else
+        # Recorder process can inherit VIRTUAL_ENV without the shell function.
+        unset VIRTUAL_ENV
+    fi
+fi
 
 if [ -n "${PYTHON}" ] ; then
     PYTHONS=( "${PYTHON}" )

cli/wake_word_sample_trainer

@@ -82,15 +82,15 @@ ALLOW_CPU_FALLBACK="$(normalize_bool "${MWW_ALLOW_CPU_FALLBACK:-${ALLOW_CPU_FALL
 if [ "${IS_BLACKWELL}" = "true" ]; then
   echo "ℹ️  Blackwell GPU detected (compute capability ${GPU_COMPUTE_CAPABILITY})."
   echo "ℹ️  Using GPU compatibility retries; CPU fallback is ${ALLOW_CPU_FALLBACK} (override with MWW_ALLOW_CPU_FALLBACK=true|false)."
+fi
 
-  # Force driver PTX fallback when XLA needs ptxas.
+# Enable driver-side PTX JIT fallback when ptxas/nvlink are unavailable.
 if [ -z "${XLA_FLAGS:-}" ]; then
   export XLA_FLAGS="--xla_gpu_unsafe_fallback_to_driver_on_ptxas_not_found"
   echo "ℹ️  Setting XLA_FLAGS=${XLA_FLAGS}"
 else
   echo "ℹ️  Using user-provided XLA_FLAGS=${XLA_FLAGS}"
 fi
-fi
 
 check_directories() {
     for d in "$@" ; do
@@ -251,6 +251,9 @@ GPU_FALLBACK_MARKERS=(
   "cuda_error_out_of_memory"
   "cuda_error_invalid_handle"
   "culaunchkernel"
+  "no ptx compilation provider is available"
+  "couldn't find a suitable version of ptxas"
+  "couldn't find a suitable version of nvlink"
   "failed to allocate"
   "cudnn"
   "cublas"

train_wake_word

@@ -98,13 +98,14 @@ export TF_XLA_FLAGS="${TF_XLA_FLAGS:---tf_xla_auto_jit=0}"
 if ${IS_BLACKWELL} ; then
     # TF 2.20 + Blackwell is often unstable with cuda_malloc_async.
     unset TF_GPU_ALLOCATOR
-    [ -z "${XLA_FLAGS:-}" ] && export XLA_FLAGS="--xla_gpu_unsafe_fallback_to_driver_on_ptxas_not_found"
     echo "ℹ️  Blackwell detected (compute capability ${GPU_COMPUTE_CAPABILITY}): using compatibility GPU defaults."
 else
     export TF_GPU_ALLOCATOR="${TF_GPU_ALLOCATOR:-cuda_malloc_async}"
-    unset XLA_FLAGS
 fi
 
+# Enable driver-side PTX JIT fallback when ptxas/nvlink are unavailable.
+[ -z "${XLA_FLAGS:-}" ] && export XLA_FLAGS="--xla_gpu_unsafe_fallback_to_driver_on_ptxas_not_found"
+
 export NVIDIA_TF32_OVERRIDE=1
 export TF_CUDNN_WORKSPACE_LIMIT_IN_MB=512
 export GLOG_minloglevel=2