pytorch_torchvision_neo.ipynb Issues: Pip Install Hard Coded Path not Working

Tested the NB in SageMaker Studio and got the following errors

NB: https://github.com/aws/amazon-sagemaker-examples/blob/master/sagemaker_neo_compilation_jobs/pytorch_torchvision/pytorch_torchvision_neo.ipynb

## Issue

```
!~/anaconda3/envs/pytorch_p36/bin/pip install torch==1.4.0 torchvision==0.5.0
!~/anaconda3/envs/pytorch_p36/bin/pip install --upgrade sagemaker

/bin/sh: 1: /root/anaconda3/envs/pytorch_p36/bin/pip: not found
```

## How to fix:
Please replace above with these:

```
import sys
!{sys.executable} -m pip install torch==1.4.0 torchvision==0.5.0
!{sys.executable} -m pip install --upgrade sagemaker

```

Open sagemaker_neo_compilation_jobs/pytorch_torchvision/pytorch_torchvision_neo.ipynb and inspect the two pip-install cells using the hard-coded pytorch_p36 path. Update them to invoke pip through the active notebook interpreter as shown in the issue, then confirm the installation cells run successfully in SageMaker Studio.

Written by the indexing model from the issue text.