Main merge release/26.02.update

[rgsl888prabhu]

Description

For #811

Summary by CodeRabbit

Release Notes

• New Features

  • Added matrix-based quadratic objective support for optimization problems
  • Introduced new API methods for improved consistency; older method names deprecated

• Documentation

  • Expanded examples section with new quadratic programming and solution inspection demonstrations
  • Updated license headers

• Dependencies

  • Added SciPy >=1.14.1 as a runtime dependency

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Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

This PR adds scipy>=1.14.1 as a runtime dependency across conda environments, recipes, and pyproject.toml. It implements matrix-based quadratic objective support in cuopt's Problem and QuadraticExpression classes, introduces deprecation wrappers for renamed methods, and adds new example files demonstrating quadratic programming capabilities.

Changes

Cohort / File(s)	Summary
Dependency Management conda/environments/all_cuda-129_arch-aarch64.yaml, conda/environments/all_cuda-129_arch-x86_64.yaml, conda/environments/all_cuda-131_arch-aarch64.yaml, conda/environments/all_cuda-131_arch-x86_64.yaml, conda/recipes/cuopt/recipe.yaml, dependencies.yaml, python/cuopt/pyproject.toml	Added scipy>=1.14.1 as a runtime dependency across conda environment configurations and Python package metadata.
Core Library Changes python/cuopt/cuopt/linear_programming/problem.py	Implemented matrix-based quadratic objective support: added qmatrix, qvars fields to QuadraticExpression; extended arithmetic operations to propagate matrix terms; replaced legacy qcoo/qcsr with unified objective_qmatrix (CSR); added deprecation wrappers for get_pdlp_warm_start_data→getWarmstartData and getQcsr→getQCSR; introduced ObjValue property; updated initialization and objective handling paths.
Documentation String Updates python/cuopt/cuopt/linear_programming/solver_settings/solver_settings.py	Updated docstring to reference new getWarmstartData method name and copyright header year.
Example Files docs/cuopt/source/cuopt-python/lp-qp-milp/examples/qp_matrix_example.py, docs/cuopt/source/cuopt-python/lp-qp-milp/examples/solution_example.py	Added two new example files demonstrating quadratic matrix-based objective construction and solution inspection with dual values and reduced costs.
License/Header Updates docs/cuopt/source/cuopt-python/lp-qp-milp/examples/expressions_constraints_example.py, docs/cuopt/source/cuopt-python/lp-qp-milp/examples/incumbent_solutions_example.py, docs/cuopt/source/cuopt-python/lp-qp-milp/examples/pdlp_warmstart_example.py, docs/cuopt/source/cuopt-python/lp-qp-milp/examples/production_planning_example.py, docs/cuopt/source/cuopt-python/lp-qp-milp/examples/simple_lp_example.py, docs/cuopt/source/cuopt-python/lp-qp-milp/examples/simple_milp_example.py, docs/cuopt/source/cuopt-python/lp-qp-milp/examples/simple_qp_example.py	Consolidated and updated copyright headers with 2025-2026 date range and affiliate references; minimal functional changes.
API Documentation docs/cuopt/source/cuopt-python/lp-qp-milp/lp-qp-milp-api.rst, docs/cuopt/source/cuopt-python/lp-qp-milp/lp-qp-milp-examples.rst	Updated exclude-members list in API docs to omit deprecated methods; added documentation sections for quadratic matrix objective and problem solution inspection.
Test Updates python/cuopt/cuopt/tests/linear_programming/test_python_API.py	Added comprehensive test cases for quadratic matrix construction and arithmetic operations; updated tests to use new getQCSR method and validate matrix-based quadratic term handling.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~60 minutes

Possibly related PRs

• Add matrix interface to problem modeling #775: Implements the same matrix-based quadratic objective support for QuadraticExpression and Problem class alongside scipy dependency addition.

Suggested labels

non-breaking, improvement

Suggested reviewers

• kaatish
• hlinsen
• chris-maes
• rg20

✨ Finishing touches

• 📝 Generate docstrings

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