Add NotImplementedError to abstract methods

[alex-hse-repository]

🚀 Feature Request

Replace pass to NotImplementedError in all the abstract methods

Motivation

Abstract methods should raise this exception when they require derived classes to override the method

Proposal

Replace pass to NotImplementedError in all the abstract methods

Test cases

No response

Alternatives

No response

Additional context

No response

Checklist

• I discussed this issue with ETNA Team

[iKintosh]

It is not necessary because we use ABC package.

from etna.models.base import Model

class ModelChild(Model):
    pass

ModelChild()

> Traceback (most recent call last):
>   File "...", line 3524, in run_code
>     exec(code_obj, self.user_global_ns, self.user_ns)
>   File "<ipython-input-4-add2283b5471>", line 1, in <cell line: 1>
>     ModelChild()
> TypeError: Can't instantiate abstract class ModelChild with abstract methods fit, forecast

[alex-hse-repository]

Actually I created the issue after your comment )