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| 1 | +What's new in PEPit 0.1.0 |
| 2 | +========================= |
| 3 | + |
| 4 | +- The method ``add_constraint`` has been added to the class ``PEP`` for general constraints not necessarily related to a specific function. |
| 5 | +For readability of your code, |
| 6 | +we suggest to use the method ``set_initial_condition`` when the constraint is the initial one, |
| 7 | +and the method ``add_constraint`` for any other constraint. |
| 8 | + |
| 9 | +- CVXPY solver options can be provided to the method ``PEP.solve``. |
| 10 | + |
| 11 | +- The `tracetrick` option of the method ``PEP.solve`` has been replaced by `dimension_reduction_heuristic`. |
| 12 | +Set to None by default, this option can be set to "trace" or "logdet{followed by a number}" to use one of those heuristic. |
| 13 | + |
| 14 | +- The verbose mode of the method ``PEP.solve`` and of the provided examples files are now integers, allowing a bigger granularity. |
| 15 | + |
| 16 | +- The parameters that characterize a function class must be provided directly as arguments of this function class, not through the dict "param" anymore. |
| 17 | +Example: `PEP.declare_function(function_class=SmoothStronglyConvexFunction, mu=.1, L=1.)` |
| 18 | + |
| 19 | +- ``null_point`` and ``null_expression`` have been added to the module ``PEPit`` to facilitate the access to a ``Point`` or an ``Expression`` initialized to 0. |
| 20 | + |
| 21 | +- 3 new function classes have been added: |
| 22 | + - ``ConvexSupportFunction`` for convex support functions (see [1]) |
| 23 | + - ``ConvexQGFunction``, for convex and quadratically upper bounded functions (see [2]) |
| 24 | + - ``RsiEbFunction``, for functions verifying lower restricted secant inequality and upper error bound (see [3]) |
| 25 | + |
| 26 | +`[1] A. Taylor, J. Hendrickx, F. Glineur (2017). |
| 27 | +Exact worst-case performance of first-order methods for composite convex optimization. |
| 28 | +SIAM Journal on Optimization, 27(3):1283–1313. |
| 29 | +<https://arxiv.org/pdf/1512.07516.pdf>`_ |
| 30 | + |
| 31 | +`[2] B. Goujaud, A. Taylor, A. Dieuleveut (2022). |
| 32 | +Optimal first-order methods for convex functions with a quadratic upper bound. |
| 33 | +<https://arxiv.org/pdf/2205.15033.pdf>`_ |
| 34 | + |
| 35 | +`[3] C. Guille-Escuret, B. Goujaud, A. Ibrahim, I. Mitliagkas (2022). |
| 36 | +Gradient Descent Is Optimal Under Lower Restricted Secant Inequality And Upper Error Bound. |
| 37 | +arXiv 2203.00342. |
| 38 | +<https://arxiv.org/pdf/2203.00342.pdf>`_ |
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