python机器学习调参GridSearchCV入门资料汇总

import pandas as pd
from sklearn import svm, datasets
from sklearn.model_selection import GridSearchCV
from sklearn.metrics import classification_report
iris = datasets.load_iris()
parameters = {'kernel':('linear', 'rbf'), 'C':[1, 2, 4], 'gamma':[0.125, 0.25, 0.5 ,1, 2, 4]}
svr = svm.SVC()
clf = GridSearchCV(svr, parameters, n_jobs=-1)
clf.fit(iris.data, iris.target)
cv_result = pd.DataFrame.from_dict(clf.cv_results_)
with open('cv_result.csv','w') as f:
     cv_result.to_csv(f)   
print('The parameters of the best model are: ')
print(clf.best_params_)
y_pred = clf.predict(iris.data)
print(classification_report(y_true=iris.target, y_pred=y_pred))

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(http://www.cnblogs.com/nwpuxuezha/p/6618205.html)

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sklearn.grid_search.GridSearchCV官网
http://scikit-learn.org/stable/modules/generated/sklearn.grid_search.GridSearchCV.html#sklearn.grid_search.GridSearchCV
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