Updates mnist_tensorflow to use the vmla driver when running on CPU.
Changes the `driver_name` variable from `"interpreter"` to `"vmla"` so that the notebook works when not using Vulkan.
I also added `**/.ipynb_checkpoints/` to `.gitignore` to prevent that from accidentally being added.
Closes https://github.com/google/iree/pull/1338
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/iree/pull/1338 from google:phoenix-meadowlark-patch-1 bb461324d5a5a1d2a9c9d9af085c46cbb4bf4405
PiperOrigin-RevId: 304209468
diff --git a/.gitignore b/.gitignore
index 990e1ad..c8b7550 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,7 @@
# Python
*.pyc
+**/.ipynb_checkpoints/
# Visual Studio files
.vs/