
                    For matrix, we pick up the best solutions provided by github life savers.
                    If google brings you here, you are so lucky! These life savers are angels, they have well solved your problems.
                    So do not waste time scrolling the original issue threads just to dig out solutions... 
                    Here you are, you are welcome. Then, go back to work!
                    

@ashed
You missed an URL on your 4th step (sudo wget...) here is the corrected and complete procedure : 

element web Debian repo key expired

My colleagues helped me to recognize that gonum.org is actually resolves in several IP addresses some of them are not blocked 

gonum Gonum.org is blocked in Russia

I agree that this would be useful I have a friend with 2 devices and I have 3 Each of our devices has to sign each other device 

element web We could cross-sign devices to aid trust when new ones join a room

This should be re-opened as this is the no 1 complaint about removing rooms Description
This is critical in combination with #5742 for us 

element web Removing rooms from communities is hard to find

Benchmarks
I'm pinging all the concerned library authors in case they disagree with the way I used their libraries: @termoshtt @Andlon @brendanzab @masonium 

nalgebra nalgebra 0.13: pure-rust matrix factorizations, LAPACK integration, and performance improvements

Your results for RMSE - MAE are OK Yes obviously evaluate trains the algorithm because it performs cross validation As your reading ratings from a dataframe 