Update PyTorch example for Ubuntu 24.04

[adarshan-intel]

Description of Changes

This pull request adds support for running the PyTorch PPML workload on Ubuntu 24.04. A virtual environment is required for installing torchvision and pillow.

Key Changes:

• README.md: Updated to include installation steps for Ubuntu 24.04.
• pytorch.manifest.template: Added venv_dir in fs.mount.
• sgx.trusted: Included venv_dir in the trusted files list.

Build Instructions

• Run make for the non-SGX version.
• Run make SGX=1 for the SGX version.

Run Instructions

Execute one of the following commands to run the workload:

• Natively: python3 pytorchexample.py
• Gramine without SGX: gramine-direct ./pytorch ./pytorchexample.py
• Gramine with SGX: gramine-sgx ./pytorch ./pytorchexample.py

Refer to the End-To-End Confidential PyTorch Workflow for more details (DCAP software must be installed).

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This change is 

[adarshan-intel]

@kailun-qin Please review

[kailun-qin]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: all files reviewed, 2 unresolved discussions, not enough approvals from maintainers (2 more required), not enough approvals from different teams (2 more required, approved so far: ) (waiting on @adarshan-intel)

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pytorch/Makefile line 8 at r1 (raw file):

SHELL := /bin/bash

THIS_DIR := $(shell pwd)

better to use sth like $(dir $(lastword $(MAKEFILE_LIST)))?

Code quote:

THIS_DIR := $(shell pwd)

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pytorch/README.md line 29 at r1 (raw file):

  is used by the Makefile.
- `python3 -m venv my_venv && source my_venv/bin/activate` to create and activate a virtual environment.
- `pip3 install --user torchvision pillow` to install the torchvision and pillow

Do we still need this?

Code quote:

--user

[kailun-qin]

Reviewable status: all files reviewed, 3 unresolved discussions, not enough approvals from maintainers (2 more required), not enough approvals from different teams (2 more required, approved so far: ) (waiting on @adarshan-intel)

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pytorch/README.md line 20 at r1 (raw file):

# Pre-requisites

The following steps should suffice to run the workload on a stock Ubuntu 18.04

what about here?

Code quote:

18.04

[adarshan-intel]

Reviewable status: all files reviewed, 3 unresolved discussions, not enough approvals from maintainers (2 more required), not enough approvals from different teams (2 more required, approved so far: ) (waiting on @kailun-qin)

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pytorch/Makefile line 8 at r1 (raw file):

Previously, kailun-qin (Kailun Qin) wrote…

better to use sth like $(dir $(lastword $(MAKEFILE_LIST)))?

Done.

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pytorch/README.md line 29 at r1 (raw file):

Previously, kailun-qin (Kailun Qin) wrote…

Do we still need this?

Done. You are right this is not reqd, while testing I removed this flag to install packages, but did not update readme.

[adarshan-intel]

Reviewable status: 1 of 3 files reviewed, 3 unresolved discussions, not enough approvals from maintainers (2 more required), not enough approvals from different teams (2 more required, approved so far: ), "fixup! " found in commit messages' one-liners (waiting on @kailun-qin)

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pytorch/README.md line 20 at r1 (raw file):

Previously, kailun-qin (Kailun Qin) wrote…

what about here?

Done.

[kailun-qin]

Reviewed 2 of 2 files at r2, all commit messages.
Reviewable status: all files reviewed, all discussions resolved, not enough approvals from maintainers (1 more required), not enough approvals from different teams (1 more required, approved so far: Intel), "fixup! " found in commit messages' one-liners