Document deciders.py

[david-z-shi]

Reference issue

Closes #158 .

Type of change

Documents deciders.py

What does this implement/fix?

Wrote docstrings for the SimpleArgmaxAverage decider.

Additional information

[levinwil]

@latasianguy

1. You should be PR’ing into the staging branch, not main
2. Travis failed due to syntax errors

[levinwil]

Some small changes:

1. On lines 26 and 31, please describe what classes actually is. You did it below as "A list of classes of type obj."
2. On line 49, you say "Fits tree classification to transformed data X with labels y.". The data is NOT transformed here, it is input data. Also, this a decider, NOT a tree classifier.
3. On line 102, ValueError is thrown when the labels have not been provided AND classes is empty
4. On lines 140 and 192, you describe transformer_ids as "A list with all transformer ids". This is not true. It is a list of transformer_ids you would like to send the inference point through to be considered in the overall decision. Also, it technically does default to None, but you should say that it defaults to using ALL transformers.

[levinwil]

On line 52m you say "Fits the a Decider to the given voters and transformers."

That's grammatically incorrect. Also, it saves the transformers and voters internally. I'd just describe it as "Fits the decider to inputs X and final classification outputs y."