Fix model signature from from_torch (#1349)

[giprayogo]

PhysicsNeMo Pull Request

Fix Module.from_torch() dropping keyword-only arguments from __init__ signature.

Description

Closes #1349 .

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.
• The CHANGELOG.md is up to date with these changes.
• An issue is linked to this pull request.
• If I am implementing a new model or modifying any existing model, I have followed the Models Implementation Coding Standards.

Dependencies

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[greptile-apps]

Greptile Overview

Greptile Summary

Simplified Module.from_torch() signature handling by directly copying the signature using inspect.signature() instead of manually reconstructing it with getfullargspec().

• Removed 19 lines of complex manual signature reconstruction logic
• The old implementation only preserved positional/keyword arguments and their defaults, dropping keyword-only arguments (*, syntax)
• The new implementation correctly preserves all parameter kinds including keyword-only arguments
• This change aligns with how signatures are handled elsewhere in the codebase (consistently uses inspect.signature)

Important Files Changed

Filename	Overview
physicsnemo/core/module.py	Simplified signature handling by directly copying inspect.signature instead of manually reconstructing it, fixing keyword-only argument preservation

[greptile-apps]

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[CharlelieLrt]

/blossom-ci

[CharlelieLrt]

/blossom-ci

[CharlelieLrt]

/blossom-ci

[CharlelieLrt]

/blossom-ci

[CharlelieLrt]

@loliverhennigh can comment on that, but looks good to me