Structure of steps - ideas for making it cleaner

[stared]

@kamil-kaczmarek, @jakubczakon I know it is a bunch of different ideas and suggestions clustered in one issue. Let me know which of those are compatible with the current roadmap. (I am happy to contribute/collaborate on some.)

• default data folder (e.g. ./.steppy/step_name/) or to be configurable if needed; overriding only when strictly necessary
• no input_data; it complicates things for no obvious reason!
• names optional, automatically generated from class names + number
• more explicit job structure (steps = Sequence([step1, step2])); vide Keras API
• adapters as inheriting from BaseTrainers,step = Rename({'a': 'aaa', 'b': 'bbb'}), vide rename in Pandas
• how to separate persist-data vs persist-parameters? (e.g. for image preprocessing, it may be time-saving to save once processed images)
• built-in data tests (e.g. len(X) == len(Y)), in def test
• built-in test if persist->load is correct (i.e. loaded data is the same as saved)

[jakubczakon]

@stared Sorry for late response.

Go-for-it's

• default data folder
• default names
• explicit job structure. Sounds great not sure how complicated it is to contruct

Could-be's

• drop input_data would create a need for input_data step I guess. I don't mind the idea but gotta see it work first.
• Rename is a good idea but remember that there could be multiple steps with the same output key that are joined somewhere so it will be more complicated than what you suggested. I would love to improve the adapter structure though.

Don't-get-it's

• persist-data is different than persist-parameters for exactly that reason
• persist>load can you elaborate?
• I am always for any tests could you explain what you mean by those data tests?

[kamil-kaczmarek]

Update here:

• default data folder -> implemented
• names optional, automatically generated from class names + number -> implmented

more on the way... 😃