add no_pytorch matrix option in dependencies.yaml

[trxcllnt]

This option allows generating dependencies without pytorch (or dependencies that pull in pytorch) in the dependencies list, which is something we have to do for NVAIE/DLFW builds.

[greptile-apps]

Greptile Summary

Adds a no_pytorch: "true" matrix option to dependencies.yaml that suppresses PyTorch and PyTorch-dependent packages (torch, torch-geometric, ogb, sentence-transformers) from requirements/pyproject outputs, enabling NVAIE/DLFW builds that must not pull in PyTorch.

• depends_on_pytorch, depends_on_pyg, depends_on_ogb, and depends_on_sentence_transformers each gain a no_pytorch: "true" guard as the first specific matrix entry, returning empty packages for requirements/pyproject output types.
• Conda outputs are intentionally unaffected by the new flag.
• py_test_cugraph_pyg file section references the individual dependency groups directly.
• No logic issues found; the pattern is consistent with the existing require_gpu and cuda_suffixed matrix guards throughout the file.

Confidence Score: 5/5

• Safe to merge — config-only change with no runtime code impact.
• Single YAML file changed with no functional logic issues. The no_pytorch: "true" guards follow established matrix matching patterns (require_gpu, cuda_suffixed) used elsewhere in the file. Empty-packages guard is correctly placed first in each matrix list so it wins on match. Conda outputs remain unaffected as intended.
• No files require special attention.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[dependency-file-generator invoked] --> B{no_pytorch=true?}
    B -- Yes --> C[requirements/pyproject outputs]
    C --> D[depends_on_pytorch → empty]
    C --> E[depends_on_pyg → empty]
    C --> F[depends_on_ogb → empty]
    C --> G[depends_on_sentence_transformers → empty]
    B -- No --> H[Normal matrix matching]
    H --> I[depends_on_pytorch → torch + index-url]
    H --> J[depends_on_pyg → torch-geometric]
    H --> K[depends_on_ogb → ogb]
    H --> L[depends_on_sentence_transformers → sentence-transformers]
    B -- conda output --> M[conda outputs unaffected by no_pytorch]
    M --> N[pytorch_geometric, ogb, sentence-transformers still included]

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_{Last reviewed commit: 0fcf344}

[jameslamb]

/merge