Datasets license; swarm readme update [skip ci] (#4303)

[holgerroth]

Fixes # .

Description

Cherry-pick #4303

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Quick tests passed locally by running ./runtest.sh.
• In-line docstrings updated.
• Documentation updated.

Fixes # .

Description

A few sentences describing the changes proposed in this pull request.

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Quick tests passed locally by running ./runtest.sh.
• In-line docstrings updated.
• Documentation updated.

[holgerroth]

/build

[greptile-apps]

Greptile Summary

This PR cherry-picks two documentation/license changes from PR #4303: it adds a third-party Apache 2.0 license file for the Hugging Face datasets library and expands the swarm learning README.md from a bare redirect link into a proper landing page.

Key observations:

• 3rdParty/datasets.LICENSE.txt: Standard Apache 2.0 license text, consistent with the other license files already in 3rdParty/. No issues.
• examples/advanced/swarm_learning/README.md: The new README references ./swarm_pt/ and ./swarm_pt/README.md as an existing example, but no swarm_pt subdirectory exists anywhere under examples/advanced/swarm_learning/. Both links will be dead until the directory is added in a separate PR. The relative paths to the self-paced-training tutorials (../../tutorials/self-paced-training/…) are valid and resolve correctly.

Confidence Score: 4/5

• Safe to merge with one minor documentation concern: the swarm_pt subdirectory referenced in the README does not yet exist.
• Both changes are documentation/license files with no runtime impact. The only issue is a broken link to a directory that hasn't been committed yet, which doesn't affect any code functionality but will confuse readers browsing the README.
• examples/advanced/swarm_learning/README.md — references a swarm_pt example directory that does not exist in the repository.

Important Files Changed

Filename	Overview
3rdParty/datasets.LICENSE.txt	Adds the standard Apache 2.0 license file for the Hugging Face datasets third-party library. No issues found.
examples/advanced/swarm_learning/README.md	Expands the README from a one-liner redirect into a proper landing page. References ./swarm_pt/ and ./swarm_pt/README.md which do not exist in the repository, resulting in two dead links. The relative paths to the self-paced-training tutorials and README are valid.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[examples/advanced/swarm_learning/README.md] --> B["./swarm_pt/ ❌ (does not exist)"]
    A --> C["./swarm_pt/README.md ❌ (does not exist)"]
    A --> D["../../tutorials/self-paced-training/part-4.../chapter-7... ✅"]
    A --> E["../../tutorials/self-paced-training/README.md ✅"]

Loading

_{Last reviewed commit: a8a1c26}

[greptile-apps]

Broken link to non-existent swarm_pt directory

The README references ./swarm_pt/ and ./swarm_pt/README.md, but the swarm_pt subdirectory does not exist in the repository — the only file under examples/advanced/swarm_learning/ is this README.md itself. Both links on this line will be dead.

If the swarm_pt example is being added in a follow-up PR, it would be safer to add this entry to the README at the same time as the directory, or add a note that the directory is coming soon to avoid confusing readers in the interim.

[holgerroth]

/build

[holgerroth]

@chesterxgchen let's merge the swarm_pt example into main before merging this PR.