Revert to gpu, add lines to prevent kernel updates

Author: mldiego

code/nnv/engine/utils/Prob_reach.m

@@ -39,7 +39,7 @@
 if isfield(reachOptions, 'train_device')
     train_device = reachOptions.train_device;
 else
-    train_device = 'cpu';
+    train_device = 'gpu';
 end
 
 if isfield(reachOptions, 'train_mode')

code/nnv/examples/Submission/VNN_COMP2025/post_install.sh

@@ -36,8 +36,8 @@ pip install scipy
 
 # For next year, let's fix gpu drivers to ensure no potential errors there...
 # Enable GPU persistence mode (prevents driver unloading)
-# sudo nvidia-smi -pm 1
+sudo nvidia-smi -pm 1
 
 # Lock the kernenl verison and GPU drivers.
-# sudo apt-mark hold linux-image-generic linux-headers-generic nvidia-driver-535
-# sudo systemctl disable unattended-upgrades
+sudo apt-mark hold linux-image-generic linux-headers-generic nvidia-driver-535
+sudo systemctl disable unattended-upgrades