ZeroDivisionError in LearningShapelets

[Mao771]

Description

I have a ZeroDivisionError trying to fit LearningShapelets
data.txt

Steps/Code to Reproduce

import pandas as pd
from pyts.classification.learning_shapelets import LearningShapelets

train_data = pd.read_csv('data.txt', index_col=0)
y_train = train_data['class']
x_train = train_data.drop('class', axis=1)
pls = LearningShapelets()
pls.fit(x_train, y_train)

Versions

NumPy 1.18.5
SciPy 1.4.1
Scikit-Learn 0.22.2
Numba 0.51.2
Pyts 0.11.0