双Y轴水平线position接入stratx plot

Question

I want to draw a horizontal line going through the 0.0 point over the plot produced by stratx's ( https://github.com/parrt/stratx ) plot_stratpd method.

How can I access the left Y-axis in this case, so that I can use y=0.0 ?

from stratx.partdep import *
X = df.drop('user_retained', axis=1)
y = df['user_retained']

plt.figure(figsize=(16,16), dpi= 80, facecolor='w', edgecolor='k')
plot_stratpd(X, y, 'percentage_of_points', 'user_retained', yrange=(-0.3, 0.6), n_trials=10)
plt.tight_layout()
plt.axhline(y=134, alpha=1, linewidth = 2, linestyle = '-')

plt.show()

Answer 1

Set up an Axes and pass it to plot_stratpd . You can then use this Axes to plot the horizontal line at regular data coordinates:

fig,ax = plt.subplots(figsize=(16,16), dpi= 80, facecolor='w', edgecolor='k')
plot_stratpd(X, y, 'percentage_of_points', 'user_retained', yrange=(-0.3, 0.6), n_trials=10, ax=ax)
ax.axhline(y=0, alpha=1, linewidth = 2, linestyle = '-')

Example:

from sklearn.datasets import load_diabetes
from stratx.partdep import *
import matplotlib.pyplot as plt

diabetes = load_diabetes()
df = pd.DataFrame(diabetes.data, columns=diabetes.feature_names)
df['y'] = diabetes.target
X = df.drop('y', axis=1)
y = df['y']

fig,ax = plt.subplots()

plot_stratpd(X, y, 'bmi', 'y', n_trials=10, ax=ax)
ax.axhline(0)

plt.show()