# Welcome to CVXPY 1.2¶

Convex optimization, for everyone.

We are building a CVXPY community on Discord. Join the conversation!

CVXPY is an open source Python-embedded modeling language for convex optimization problems. It lets you express your problem in a natural way that follows the math, rather than in the restrictive standard form required by solvers.

For example, the following code solves a least-squares problem with box constraints:

```import cvxpy as cp
import numpy as np

# Problem data.
m = 30
n = 20
np.random.seed(1)
A = np.random.randn(m, n)
b = np.random.randn(m)

# Construct the problem.
x = cp.Variable(n)
objective = cp.Minimize(cp.sum_squares(A @ x - b))
constraints = [0 <= x, x <= 1]
prob = cp.Problem(objective, constraints)

# The optimal objective value is returned by `prob.solve()`.
result = prob.solve()
# The optimal value for x is stored in `x.value`.
print(x.value)
# The optimal Lagrange multiplier for a constraint is stored in
# `constraint.dual_value`.
print(constraints[0].dual_value)
```

This short script is a basic example of what CVXPY can do. In addition to convex programming, CVXPY also supports a generalization of geometric programming, mixed-integer convex programs, and quasiconvex programs.

For a guided tour of CVXPY, check out the tutorial. For applications to machine learning, control, finance, and more, browse the library of examples. For background on convex optimization, see the book Convex Optimization by Boyd and Vandenberghe.

CVXPY relies on the open source solvers OSQP, SCS, and ECOS. Additional solvers are supported, but must be installed separately.

Community.

The CVXPY community consists of researchers, data scientists, software engineers, and students from all over the world. We welcome you to join us!

• To chat with the CVXPY community in real-time, join us on Discord.

• To have longer, in-depth discussions with the CVXPY community, use Github discussions.

• To share feature requests and bug reports, use the issue tracker.

Development.

CVXPY is a community project, built from the contributions of many researchers and engineers.

CVXPY is developed and maintained by Steven Diamond, Akshay Agrawal, Riley Murray, and Bartolomeo Stellato with many others contributing significantly. A non-exhaustive list of people who have shaped CVXPY over the years includes Stephen Boyd, Eric Chu, Robin Verschueren, Jaehyun Park, Enzo Busseti, AJ Friend, Judson Wilson, Chris Dembia, and Philipp Schiele.

We appreciate all contributions. To get involved, see our contributing guide and join us on Discord.

News.

In early 2022 we started moving CVXPY to semantic versioning. Starting with CVXPY v1.2.0, we will assign version numbers following the specification at semver.org. This will result in us incrementing CVXPY’s minor version number (the “x” in “CVXPY 1.x.y”) much more often than before. Moving forward we will also make it a priority to differentiate between what is and is-not part of CVXPY’s public API.