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CHANGELOG.md

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Version 1.0 (targets)

  • TODO add FAQ with info about solver errors, DCP errors, adding an objective in a for loop, dot product with numpy ND arrays.
  • TODO change *args to lists.
  • TODO change OPTIMAL to SOLVED?
  • TODO change SDP to only set upper triag == lower triag.
  • TODO separate out parts of DCPAttr and refactor so universal rules used for affine atoms.
  • TODO change size to size[0]*size[1] and shape to size.
  • TODO add integer/boolean variables.
  • TODO return 2D arrays instead of matrices.
  • TODO add sets and domains for Parameters/Variables that affect DCP properties.
  • TODO PSD parameters?
  • TODO warmstart based on variable values.
  • TODO change diag for matrices to diagm so can choose which diagonal to access.
  • TODO make sure Bool.value = ? etc satisfy constraints.
  • TODO make upper_tri_to_full atom?
  • TODO parameterize upper_tri (so takes elems above kth diagonal).
  • TODO replace norm with vecnorm and norm (for matrices) (see how numpy does it).
  • TODO redo tree_mat so it uses SMs (and doesn't compress the left hand side of A*x into a matrix).
  • TODO separate constant and linear components of expressions so potentially can cache matrix factorizations.
  • TODO add logistic_loss

Version 0.2.18 (next release)

  • Requires ECOS 1.1.1.
  • Removed norm_largest.
  • Added GLPK interface.
  • Updated ECOS BB exit codes.
  • Factored out ability to get parameterized entries of matrix.

Version 0.2.17

  • Optimizes rmul to mul.
  • Added warmstart.
  • Disabled MIP tests until nondeterminism is resolved.
  • Added sum_largest, sum_smallest, norm_largest, lambda_sum_largest, lambda_sum_largest, and lambda_sum_smallest.

Version 0.2.16

  • Added log1p.
  • Added scalene penalty.
  • Made LinOp for multiplication on the right.
  • TODO break up DCPAttr so only use atom DCP function.
  • Added boolean and integer variables.
  • Made geo_mean elementwise.
  • Python 3 support!!!
  • Error checking for x**p.
  • Added upper_tri.
  • Changed BoolVar, IntVar to Bool, Int.
  • Simplified Huber loss graph_implementation.

Version 0.2.15

  • Made it so you can assign a value to a variable for an initial value.
  • Overloaded power operator.

Version 0.2.14

  • Added unpack_results function to update problem state given results from a solver.
  • Fixed bug where parameters were cached.

Version 0.2.13

  • Got rid of NumPy 1D array warning.
  • Made vstack and hstack not create new variables.
  • Replaced memoize with lazyprop in constraints.
  • Refactored code for caching problem parsing.

Version 0.2.12

  • Changed cvxpy to use new SCS interface.

Version 0.2.11

  • Renamed semidefinite to Semidef.
  • Switched solver_specific_opts to **kwargs.
  • Added vec and documentation for reshape and vec.
  • Changed repr to print names in line with class names.
  • Changed str for Problem.
  • Made < and > map to <= and >=.
  • Added warning for NumPy 1D arrays.

Version 0.2.10

  • CVXPY throws an error when a solver error is encountered.
  • Presolver removes constraints with no variables.
  • Conversion from non-linear constraints to linear constraints is cached. This fixes issue #120.2.

Version 0.2.9

  • Fixed bug with sign multiplication.
  • Added check that objective is Minimize/Maximize.
  • Fixed bug with key error when solving exponential cone problem with CVXOPT.

Version 0.2.8

  • Removed a stray println.

Version 0.2.7

  • CVXPY import can succeed even if SCS import fails.
  • The sign of vector and matrix constant is positive (negative) if all the entries are positive (negative), instead of always being unknown.
  • Can now use negative indices.
  • Added *_INACCURATE return codes.

Version 0.2.6

  • Made all lin_to_matrix functions return SciPy sparse matrix or NumPy matrix (instead of ndarray).