Update and homologate syntax

[CristopherA96]

Hi, I am Cristopher,

I was recently working with this repository and had made a few small changes locally, some of these changes have been recently released, such as np.float -> float commit.

First change:
In addition to these changes, I consider that the batch/job_template.sh script file has obsolete instructions such as python2 "batch/train_risk_slim.py --help, since in the script you use python3 to run the tool, so when using python2 it does not works, and may cause confusion for some novice users.

Second change:
In the same way, in the solution_pool.py file, there are some warnings that are related to the use of the "is" syntax in python3, so checking the logic I think that "==" adapts to the functionality that you want to give with "is" syntax.

These minor changes can give you a better understanding of the instructions and what is done in the repository.

As I mentioned, these are changes that for non-advanced users can cause confusion.

Thanks for your time, and I hope this will be helpful.