How to hide cvxpy warnings: warn: a- > P (column pointers) not strictly increasing, column x empty?

The problem background

Recently in use python When programming to solve problems related to Quantum Computing , It involves positive semidefinite programming with complex matrices (SDP), stay google I searched the Internet for some discoveries cvxpy Is the most suitable for this problem . It's not easy to finish coding , The following warnings always appear when running the program （ Every run is the same error ）：

WARN: A->p (column pointers) not strictly increasing, column 3 empty
WARN: A->p (column pointers) not strictly increasing, column 6 empty
WARN: A->p (column pointers) not strictly increasing, column 10 empty
WARN: A->p (column pointers) not strictly increasing, column 13 empty
WARN: A->p (column pointers) not strictly increasing, column 17 empty
WARN: A->p (column pointers) not strictly increasing, column 20 empty
WARN: A->p (column pointers) not strictly increasing, column 24 empty
WARN: A->p (column pointers) not strictly increasing, column 27 empty

in fact , My program can run through , And the result is also right , But the above warning will pop up before the result comes out , It affects the beauty and prevents me from seeing the results , So I made up my mind to eliminate this warning .

To solve the process

stay github After shopping around, I got the following conclusion ：

• cvxpy In solving SDP The default is SCS solver
• SCS and CVXOPT Solvers often pop up warnings , But later CVXOPT This one of bug It's fixed
• Big guys recommend using more robust The solver ：MOSEK

install MOSEK

Because of my own IDE yes Visual Studio Code, And it USES the Anaconda Environment , So after getting the above conclusion, I decided to use conda install -c mosek mosek To install MOSEK.

After installation, use the following command to detect MOSEK Is the installation successful （ If no error is reported, the installation is considered successful ）：

import mosek

If there is such a mistake ：

cvxpy.error.SolverError: The solver MOSEK is not installed.

You need to download the corresponding distribution：https://www.mosek.com/downloads/

You can choose to download according to your own operating system , After installation, you need to configure environment variables , I assume you are Windows 64 Users and MOSEK The installation path for is X:\Program Files\Mosek, Then you need to X:\Program Files\Mosek\9.3\tools\platform\win64x86\bin Add to environment variables PATH In the middle （ Not Windows Users can directly refer to Official documents ）.

License To configure

After installation , You need to configure License Can be used MOSEK.

If it's the student party , Suggested choice Academic Licenses, Because it has the 365 Free trial period of days （ And can extend ）, Related website ：https://www.mosek.com/license/request/personal-academic/

Fill in the mailbox of your school , The general domain name is XXX.edu.cn, At the bottom of the Organization Just fill in the English name of your school .

After that, the official will send an email to your mailbox , The attachment is mosek.lic, Put it on

C:\Users\ Your username \mosek\

It's OK , without mosek Folder , Then create one manually ！

GLPK And GLPK_MI Related issues

In fact, it's over here , But some of my friends may encounter the following mistakes like me ：

Encountered unexpected exception importing solver GLPK
Encountered unexpected exception importing solver GLPK_MI

At this point, just switch to the corresponding conda Environmental Science , And then execute

conda uninstall glpk

That's it . It may take a long time , Just wait patiently .