BUG Automatic install of classes fails

[ngazagna]

First, I have corrected in the benchmark solver files of benchmark_logreg_l2 in my branch FIX_utils_import

from benchopt.util import safe_import_context

by

from benchopt.utils.safe_import import safe_import_context

to solve a first bug which should be raised in an issue in all concerned benchmarks.

Then I still get this error because lightning cannot be installed automatically by the Benchmark class:

$ benchopt run ../benchmarks/benchmark_logreg_l2 
Installing Lightning in None:... failed
/home/nidham/phd/benchOpt/benchopt/benchmark.py:116: UserWarning: Some solvers were not successfully installed, and will thus be ignored. Use 'export BENCHO_RAISE_INSTALL_ERROR=true' to stop at any installation failure and print the traceback.
  warnings.warn(
/tmp/tmp02ch3slw: line 2: benchopt.benchmark.Benchmark: No such file or directory

[tomMoral]

You should use the master version of the benchmark where I fixed all the import error: benchopt/benchmark_logreg_l2@4fc90c2

Also, if you want to see the install error, you can call BENCHO_RAISE_INSTALL_ERROR=1 benchopt run path/bench/logreg_l2.

Finally, it seems that you are calling the benchmark with an existing conda env that does not have the latest version of benchopt. You should use the -r flag that will reinstall everything to get rid of the line 2: benchopt.benchmark.Benchmark: No such file or directory error.

[tomMoral]

Ok It was a bug on our side actually.
This should have been fixed by #108