python - 如何通过 scikit-learn 保存训练好的模型？

Question

我正在尝试重新创建经过训练的模型的预测，但我不知道如何保存模型。 例如，我想保存经过训练的高斯处理回归模型，并在训练模型后重新创建预测。 我用来训练模型的包是 scikit-learn。

kernel = DotProduct() + WhiteKernel()
gpr = GaussianProcessRegressor(kernel=kernel,random_state=0)
gpr.fit(X,y)

Answer 1

您可以使用:

<强>1。 pickle

from sklearn import svm
from sklearn import datasets

iris = datasets.load_iris()
X, y = iris.data, iris.target

clf = svm.SVC()
clf.fit(X, y)  

##########################
# SAVE-LOAD using pickle #
##########################
import pickle

# save
with open('model.pkl','wb') as f:
    pickle.dump(clf,f)

# load
with open('model.pkl', 'rb') as f:
    clf2 = pickle.load(f)

clf2.predict(X[0:1])

<强>2。 joblib

来自scikit-learn documentation :

In the specific case of scikit-learn, it may be better to use joblib’s replacement of pickle (dump & load), which is more efficient on objects that carry large numpy arrays internally as is often the case for fitted scikit-learn estimators, but can only pickle to the disk and not to a string:

from sklearn import svm
from sklearn import datasets

iris = datasets.load_iris()
X, y = iris.data, iris.target

clf = svm.SVC()
clf.fit(X, y)  

##########################
# SAVE-LOAD using joblib #
##########################
import joblib

# save
joblib.dump(clf, "model.pkl") 

# load
clf2 = joblib.load("model.pkl")

clf2.predict(X[0:1])