CVQP
CVQP is a Python solver for CVaR-constrained quadratic programs. It also provides an efficient projection onto CVaR constraints. Both scale to millions of scenarios. For details, see our paper.
Installation
pip install cvqp
Background
The sample Conditional Value-at-Risk (CVaR) at level $\beta \in (0,1)$ of a vector $z \in \mathbf{R}^m$ is
$$ \phi_\beta(z) = \frac{1}{k}\sum_{i=1}^k z_{[i]}, \qquad k = (1-\beta)m, $$
where $z_{[1]} \geq z_{[2]} \geq \cdots \geq z_{[m]}$ are the components of $z$ sorted in nonincreasing order. In other words, CVaR is the average of the $k$ largest entries. For example, with $\beta = 0.95$ and $m = 10{,}000$ scenarios, CVaR is the average of the 500 largest entries.
The CVaR constraint $\phi_\beta(z) \leq \kappa$ is equivalent to $f_k(z) \leq d$, where $f_k(z) = \sum_{i=1}^k z_{[i]}$ is the sum of the $k$ largest components and $d = \kappa k$.
Usage
Solving a CVQP
The CVQP solver handles problems of the form
$$ \begin{array}{ll} \text{minimize} & (1/2), x^T P x + q^T x \ \text{subject to} & \phi_\beta(Ax) \leq \kappa \ & l \leq Bx \leq u, \end{array} $$
where $x \in \mathbf{R}^n$ is the decision variable, $P \in \mathbf{S}^n_+$ is positive semidefinite (or absent for linear objectives), and $A \in \mathbf{R}^{m \times n}$ maps $x$ to $m$ scenario losses. The additional constraints $l \leq Bx \leq u$ encode box constraints, equality constraints, or other polyhedral constraints on $x$. The following example solves a portfolio optimization problem with a CVaR constraint on losses.
import numpy as np
import scipy.sparse as sp
import cvqp
# Portfolio: n assets, m historical return scenarios
n, m = 10, 5000
np.random.seed(0)
R = np.random.randn(m, n) * 0.05 + 0.01 # return scenarios
mu = R.mean(axis=0) # expected returns
Sigma = np.cov(R.T) # covariance
P = Sigma
q = -mu
A = -R # losses = negative returns
B = sp.vstack([np.ones(n), sp.eye(n)]) # sum-to-one + long-only
l = np.concatenate([[1.0], np.zeros(n)])
u = np.concatenate([[1.0], np.full(n, np.inf)])
result = cvqp.solve(P, q, A, B, l, u, beta=0.95, kappa=0.1)
print(result.status, result.value)
CVaR projection
The CVaR projection finds the closest point to a vector $v$ that satisfies a CVaR constraint,
$$ \begin{array}{ll} \text{minimize} & \lVert v - z \rVert_2^2 \ \text{subject to} & \phi_\beta(z) \leq \kappa. \end{array} $$
import numpy as np
import cvqp
v = np.random.randn(100_000)
z = cvqp.proj_cvar(v, beta=0.95, kappa=1.0)
Sum-of-k-largest projection
Since $\phi_\beta(z) \leq \kappa$ is equivalent to $f_k(z) \leq d$ with $k = \lceil(1-\beta)m\rceil$ and $d = \kappa k$, the projection can also be expressed as
$$ \begin{array}{ll} \text{minimize} & \lVert v - z \rVert_2^2 \ \text{subject to} & f_k(z) \leq d, \end{array} $$
and is available directly as proj_sum_largest.
import numpy as np
import cvqp
v = np.random.randn(100_000)
k = int(0.05 * len(v)) # same as ceil((1 - 0.95) * m)
d = 1.0 * k # same as kappa * k
z = cvqp.proj_sum_largest(v, k, d)
The two projection functions are equivalent: proj_cvar(v, beta, kappa) converts to proj_sum_largest(v, k, d) internally.
Paper experiments
See experiments/ to reproduce the numerical results from the paper.
python experiments/plot.py # generate figures from existing results
python experiments/run.py portfolio # re-run CVQP benchmarks
python experiments/run.py projection # re-run projection benchmarks
Citation
@article{luxenberg2025operator,
title={An operator splitting method for large-scale CVaR-constrained quadratic programs},
author={Luxenberg, Eric and P{\'e}rez-Pi{\~n}eiro, David and Diamond, Steven and Boyd, Stephen},
journal={arXiv preprint arXiv:2504.10814},
year={2025}
}
1 maintainer
Metadata
1 maintainer
Release files for cvqp 0.3.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
|---|---|---|---|---|
| cvqp-0.3.0.tar.gz | 18.7 kB | With provenance | Details |
Built distributions (wheels)
| File | Reset | |||
|---|---|---|---|---|
| cvqp-0.3.0-cp314-cp314t-win_amd64.whl | CPython 3.14 | CPython 3.14 free-threading | Windows x86-64 | Details |
| cvqp-0.3.0-cp314-cp314t-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl | CPython 3.14 | CPython 3.14 free-threading | Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64 | Details |
| cvqp-0.3.0-cp314-cp314t-macosx_11_0_arm64.whl | CPython 3.14 | CPython 3.14 free-threading | macOS 11.0+ ARM64 | Details |
| cvqp-0.3.0-cp314-cp314t-macosx_10_13_x86_64.whl | CPython 3.14 | CPython 3.14 free-threading | macOS 10.13+ x86-64 | Details |
| cvqp-0.3.0-cp314-cp314-win_amd64.whl | CPython 3.14 | CPython 3.14 | Windows x86-64 | Details |
| cvqp-0.3.0-cp314-cp314-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl | CPython 3.14 | CPython 3.14 | Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64 | Details |
| cvqp-0.3.0-cp314-cp314-macosx_11_0_arm64.whl | CPython 3.14 | CPython 3.14 | macOS 11.0+ ARM64 | Details |
| cvqp-0.3.0-cp314-cp314-macosx_10_13_x86_64.whl | CPython 3.14 | CPython 3.14 | macOS 10.13+ x86-64 | Details |
| cvqp-0.3.0-cp313-cp313-win_amd64.whl | CPython 3.13 | CPython 3.13 | Windows x86-64 | Details |
| cvqp-0.3.0-cp313-cp313-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl | CPython 3.13 | CPython 3.13 | Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64 | Details |
| cvqp-0.3.0-cp313-cp313-macosx_11_0_arm64.whl | CPython 3.13 | CPython 3.13 | macOS 11.0+ ARM64 | Details |
| cvqp-0.3.0-cp313-cp313-macosx_10_13_x86_64.whl | CPython 3.13 | CPython 3.13 | macOS 10.13+ x86-64 | Details |
| cvqp-0.3.0-cp312-cp312-win_amd64.whl | CPython 3.12 | CPython 3.12 | Windows x86-64 | Details |
| cvqp-0.3.0-cp312-cp312-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl | CPython 3.12 | CPython 3.12 | Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64 | Details |
| cvqp-0.3.0-cp312-cp312-macosx_11_0_arm64.whl | CPython 3.12 | CPython 3.12 | macOS 11.0+ ARM64 | Details |
| cvqp-0.3.0-cp312-cp312-macosx_10_13_x86_64.whl | CPython 3.12 | CPython 3.12 | macOS 10.13+ x86-64 | Details |
| cvqp-0.3.0-cp311-cp311-win_amd64.whl | CPython 3.11 | CPython 3.11 | Windows x86-64 | Details |
| cvqp-0.3.0-cp311-cp311-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl | CPython 3.11 | CPython 3.11 | Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64 | Details |
| cvqp-0.3.0-cp311-cp311-macosx_11_0_arm64.whl | CPython 3.11 | CPython 3.11 | macOS 11.0+ ARM64 | Details |
| cvqp-0.3.0-cp311-cp311-macosx_10_9_x86_64.whl | CPython 3.11 | CPython 3.11 | macOS 10.9+ x86-64 | Details |
| cvqp-0.3.0-cp310-cp310-win_amd64.whl | CPython 3.10 | CPython 3.10 | Windows x86-64 | Details |
| cvqp-0.3.0-cp310-cp310-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl | CPython 3.10 | CPython 3.10 | Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64 | Details |
| cvqp-0.3.0-cp310-cp310-macosx_11_0_arm64.whl | CPython 3.10 | CPython 3.10 | macOS 11.0+ ARM64 | Details |
| cvqp-0.3.0-cp310-cp310-macosx_10_9_x86_64.whl | CPython 3.10 | CPython 3.10 | macOS 10.9+ x86-64 | Details |
Total release size: 2.2 MB
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