"""
===================================
Plot pairwise features
===================================

creates a pairwise comparison between features. 
"""
# Author: L.Kouadio 
# Licence: BSD-3-clause

#%%
# Plot the numerical pairwise correlation 
# It shows ['pearson'|'spearman'|'covariance'] correlation. 
from watex.datasets import fetch_data 
from watex.view import ExPlot 
from watex.utils import bi_selector 
data = fetch_data ('bagoue original').get('data=dfy1') 
# we can use the biselector for selectng the categorical and numerical
# feature for plotting 
num_data, cat_data = bi_selector (data, return_frames= True )
p= ExPlot(tname='flow', fig_size=(7, 5)).fit(num_data)
p.plotpairwisecomparison(fmt='.2f',  pkg ='yb',
								 annot=True, 
								 cmap='RdBu_r', 
								 vmin=-1, 
								 vmax=1 )

#%%
# Plot the categorical pairwise correlation 
# For visulizing the categorical features 
# using the spearman rho correlation 

p= ExPlot(tname='geol', fig_size=(7, 5)).fit(cat_data)
p.plotpairwisecomparison(fmt='.2f', 
                         corr='spearman', 
                         pkg ='yb',
								 annot=True, 
								 cmap='RdBu_r', 
								 vmin=-1, 
								 vmax=1 )