updates

Author: HumphreyYang

lectures/back_prop.md

@@ -33,9 +33,10 @@ In addition to what's included in base Anaconda, we need to install the followin
 ```{code-cell} ipython3
 :tags: [hide-output]
 
-import os
-os.system("pip install kaleido");
-os.system("conda install -y -c plotly plotly plotly-orca retrying");
+import subprocess
+print(subprocess.run(["pip", "install", "kaleido"], 
+             capture_output=True, text=True).stdout)
+print(subprocess.run(["conda", "install", "-y", "-c", "plotly", "plotly", "plotly-orca", "retrying"], capture_output=True, text=True).stdout)
 ```
 
 ```{note}

lectures/status.md

@@ -47,6 +47,6 @@ print(f"JAX backend: {jax.devices()[0].platform}")
 and this lecture series also has access to the following GPU
 
 ```{code-cell} ipython3
-import os
-os.system("nvidia-smi");
+import subprocess
+print(subprocess.run(['nvidia-smi'], capture_output=True, text=True).stdout)
 ```