scikit-learn中的线性回归

Question

I started learning maching learning on Python using Pandas and Sklearn. I tried to use the LinearRegression().fit method :

import numpy as np 
import pandas as pd 
import matplotlib.pyplot as plt 
from sklearn.linear_model import LinearRegression
from sklearn.model_selection import train_test_split 
house_data = pd.read_csv(r"C:\Users\yassine\Desktop\ml\OC-tp-ML\house_data.csv")
y = house_data[["price"]] 
x = house_data[["surface","arrondissement"]] 
X = house_data.iloc[:, 1:3].values  
x_train, x_test, y_train, y_test = train_test_split (x, y, test_size=0.25, random_state=1) 
model = LinearRegression()
model.fit(x_train, y_train) 

When I run the code, I have this message :

ValueError: Input contains NaN, infinity or a value too large for dtype('float64').

Can You help me please.

Answer 1

Machine learning models may require you to impute the data as part of your data cleaning process. Linear regression cares a lot about the yhat, so I usually start with imputing the mean. If you aren't comfortable imputing the missing data, you can drop the observations that contain NaN (provided you only have a small proportion of NaN observations.)

Imputing the mean can look like this:

df = df.fillna(df.mean())

Imputing to zero can look like this:

df = df.fillna(0)

Imputing to a custom result can look like:

df = df.fillna(my_func(args))

Dropping altogether can look like:

df = df.dropna()

Prepping so that inf may be caught by these methods ahead of time can look like:

df.replace([np.inf, -np.inf], np.nan)