kNN: Optimal k

[bdiptesh]

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

Describe the solution you'd like
kNN module for both classification and regression. Determine optimal k.

Methods:

1. Classification
2. Regression

Parameters:

1. Euclidean
2. Cosine
3. Majority voting
4. Weighted voting

Expected input

df: pandas.DataFrame
y_var: List[str]
x_var: List[str]
method: Union[str]
param: Dict

Expected API

fit
predict

Acceptance criteria

• Integration tests

Tasks

• Define integration tests
• First pass implementation of kNN
• Modular implementation