[FEATURE] Add in CTRL + C Early Stopping!

[windowshopr]

Is your feature request related to a problem? Please describe. Nope.

• A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] None.

• What is the use case for this feature? When a user wants to stop the optimization process manually (without using a callback), they could press CTRL + C to stop. The best evolved_estimator at the time of pressing CTRL + C will be returned and optimization will stop, allowing the rest of the script to continue.

Describe the solution you'd expect See above

• A clear and concise description of what you want to happen. TPOT is a good reference for this. The user presses CTRL + C after at least 1 pipeline has been fitted, and the best pipeline found until that point is used. The rest of the script can continue after that, like the evolved_estimator.predict() function.

• Describe the workflow you want to enable See above.

Additional context Love the tool! Would be cool to see this implemented :D

[rodrigo-arenas]

Hi @windowshopr thanks for your message, I'm glad you are enjoying the package! This seems like a nice feature, I'll look for in more detail how to implement it

Greetings

[windowshopr]

Thanks! I think it would be a cool feature to add I think! Psedo-ish code might look something like:

try:
    while True:
        # All the training stuff here

except KeyboardInterrupt:
        # Return the best model here/perform any final steps in the .fit() function
    print('Manually stopped training!')

[rodrigo-arenas]

Yea, I see that in TPOT, I'll look further how to get this like callback or something that doesn't requires a big try/except block, thanks for the tip!

[rodrigo-arenas]

Hi @windowshopr, this is now implemented in PR #86.

Training gracefully stops if interrupted by some of these exceptions: KeyboardInterrupt (ctrl+c), SystemExit, StopIteration. When one of these exceptions is raised, the model finishes the current generation and saves the current best model. It only works if at least one generation has been completed.

[windowshopr]

Awesome! Thanks!!!