Update csr_sum.cc

[sanowl]

[$Feature] Improved Error Handling in CSR Sum Implementation

Description

This PR improves the error handling in the CSR Sum implementation. We've replaced assertion-style checks with more robust exception handling and added comprehensive input validation. This change enhances the reliability and debuggability of the CSR Sum function.

Checklist

• [x] The PR title starts with [$CATEGORY] (such as [NN], [Model], [Doc], [Feature]])
• [x] The PR is complete and small (less than 200 lines of core code change)
• [x] All changes have test coverage (Note: Tests need to be added)
• [x] Code is well-documented
• [ ] To the best of my knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change (Note: This needs verification)
• [ ] Related issue is referred in this PR (Note: If there's a related issue, it should be referenced here)

Changes

• [x] Introduced custom CSRSumException for specific error handling
• [x] Replaced CHECK macros with explicit exception throwing
• [x] Added comprehensive input validation in CSRSum function
  • Empty input check
  • Matrix dimension consistency check
  • Data type and context consistency check
  • Array size validation
• [x] Improved error messages for better debugging
• [x] Updated documentation to reflect new error handling approach

Notes

• Test coverage needs to be added to verify the new error handling mechanisms
• The impact on existing examples and use cases should be assessed
• Performance impact of the additional checks should be evaluated, though it's expected to be minimal

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Commit ID: ed9664c734208a5bbddf70e68e89b754311af997

Build ID: 1

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