y_train_actual
元の値を使用して、sci-kit 学習モデルからの予測の平均二乗誤差を計算しようとしていますsalaries
。
問題:ただし、mean_squared_error(y_train_actual, salaries)
で、エラーが発生しますTypeError: unsupported operand type(s) for -: 'numpy.ndarray' and 'numpy.ndarray'
。list(salaries)
2 番目のパラメーターの代わりに使用するとsalaries
、同じエラーが発生します。
mean_squared_error(y_train_actual, y_valid_actual)
エラーが発生していますFound array with dim 40663. Expected 244768
の正しい配列型に変換するにはどうすればよいsklearn.netrucs.mean_squared_error()
ですか?
コード
from sklearn.metrics import mean_squared_error
y_train_actual = [ np.exp(float(row)) for row in y_train ]
print mean_squared_error(y_train_actual, salaries)
エラー
TypeError Traceback (most recent call last)
<ipython-input-144-b6d4557ba9c5> in <module>()
3 y_valid_actual = [ np.exp(float(row)) for row in y_valid ]
4
----> 5 print mean_squared_error(y_train_actual, salaries)
6 print mean_squared_error(y_train_actual, y_valid_actual)
C:\Python27\lib\site-packages\sklearn\metrics\metrics.pyc in mean_squared_error(y_true, y_pred)
1462 """
1463 y_true, y_pred = check_arrays(y_true, y_pred)
-> 1464 return np.mean((y_pred - y_true) ** 2)
1465
1466
TypeError: unsupported operand type(s) for -: 'numpy.ndarray' and 'numpy.ndarray'
コード
y_train_actual = [ np.exp(float(row)) for row in y_train ]
y_valid_actual = [ np.exp(float(row)) for row in y_valid ]
print mean_squared_error(y_train_actual, y_valid_actual)
エラー
ValueError Traceback (most recent call last)
<ipython-input-146-7fcd0367c6f1> in <module>()
4
5 #print mean_squared_error(y_train_actual, salaries)
----> 6 print mean_squared_error(y_train_actual, y_valid_actual)
C:\Python27\lib\site-packages\sklearn\metrics\metrics.pyc in mean_squared_error(y_true, y_pred)
1461
1462 """
-> 1463 y_true, y_pred = check_arrays(y_true, y_pred)
1464 return np.mean((y_pred - y_true) ** 2)
1465
C:\Python27\lib\site-packages\sklearn\utils\validation.pyc in check_arrays(*arrays, **options)
191 if size != n_samples:
192 raise ValueError("Found array with dim %d. Expected %d"
--> 193 % (size, n_samples))
194
195 if not allow_lists or hasattr(array, "shape"):
ValueError: Found array with dim 40663. Expected 244768
コード
print type(y_train)
print type(y_train_actual)
print type(salaries)
結果
<type 'list'>
<type 'list'>
<type 'tuple'>
print y_train[:10]
[10.126631103850338, 10.308952660644293, 10.308952660644293, 10.221941283654663, 10.126631103850338, 10.126631103850338, 11.225243392518447, 9.9987977323404529, 10.043249494911286, 11.350406535472453]
給与を印刷する[:10]
('25000', '30000', '30000', '27500', '25000', '25000', '75000', '22000', '23000', '85000')
印刷リスト(給与)[:10]
['25000', '30000', '30000', '27500', '25000', '25000', '75000', '22000', '23000', '85000']
print len(y_train)
244768
プリントレンズ(給与)
244768