python - ValueError:X每个样本具有231个功能；期待1228

这是模型训练的脚本顶部（我正在使用Logistic回归）：

data_raw = pd.read_sql(sql,cnxn)

pd.Series(data_raw.columns)
pd.Series(data_raw.dtypes)

data_raw.describe(include='all')

data_raw['collision_type'] = data_raw.loc[0:, 'collision_type'].replace('?', 'Unknown')

data_raw['property_damage'] = data_raw.loc[0:, 'property_damage'].replace('?', 'Unknown')

data_raw.isnull().sum()

dropping_columns = ['months_as_customer', 'policy_bind_date', 'age', 'policy_number', 'policy_annual_premium', 'insured_zip',
                    'capital_gains', 'capital_loss', 'total_claim_amount', 'injury_claim', 'property_claim', 'vehicle_claim',
                   'auto_year']

data_cleaned = data_raw.drop(dropping_columns, axis=1)

data_preprocessed = pd.get_dummies(data_cleaned, drop_first=True)


targets = data_preprocessed['fraud_reported_Y']
features = data_preprocessed.drop(['fraud_reported_Y'], axis=1)

x_train, x_test, y_train, y_test = train_test_split(features, targets, test_size=0.2, random_state=420)

from sklearn.linear_model import LogisticRegression
logreg = LogisticRegression()
logreg.fit(x_train, y_train)
y_pred = logreg.predict(x_test)

现在，我尝试对测试输入（从SQL表导入的测试数据集）进行预测：

test = df['TestTable']
test = test[0]
sql = 'SELECT * FROM '+ test
test_raw = pd.read_sql(sql,cnxn)

#sample_rows = test_raw.sample(n=5)

test_raw.describe(include='all')

test_raw['collision_type'] = data_raw.loc[0:, 'collision_type'].replace('?', 'Unknown')

test_raw['property_damage'] = data_raw.loc[0:, 'property_damage'].replace('?', 'Unknown')

test_raw.isnull().sum()

print(test_raw.shape)

test_dropped = test_raw.drop(dropping_columns, axis=1)
test_preprocessed = pd.get_dummies(test_dropped, drop_first=True)

logreg = LogisticRegression()
logreg.fit(x_train, y_train)
test_predicted = logreg.predict(test_preprocessed)

这是我得到的错误：

Traceback (most recent call last):

  File "<ipython-input-149-e6d470e94433>", line 1, in <module>
    runfile('C:/Users/BusinessUser/Downloads/insurance_claim_fraud_detection-master/insurance_claim_fraud_detection.py', wdir='C:/Users/BusinessUser/Downloads/insurance_claim_fraud_detection-master')

  File "C:\Users\BusinessUser\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 827, in runfile
    execfile(filename, namespace)

  File "C:\Users\BusinessUser\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 110, in execfile
    exec(compile(f.read(), filename, 'exec'), namespace)

  File "C:/Users/BusinessUser/Downloads/insurance_claim_fraud_detection-master/insurance_claim_fraud_detection.py", line 402, in <module>
    test_predicted = logreg.predict(test_preprocessed)

  File "C:\Users\BusinessUser\Anaconda3\lib\site-packages\sklearn\linear_model\base.py", line 289, in predict
    scores = self.decision_function(X)

  File "C:\Users\BusinessUser\Anaconda3\lib\site-packages\sklearn\linear_model\base.py", line 270, in decision_function
    % (X.shape[1], n_features))

ValueError: X has 231 features per sample; expecting 1228

我的火车数据集有999行，带有最终预测结果列，而测试数据集有50行，没有预测结果列。其他列基本相同。

我是一个新手，我很确定有关于此模型训练我尚不了解的基本知识。非常感谢你们帮助我。

最佳答案

例如，使用函数test_preprocessed检查用于预测（x_train）的数据的列数（特征）与用于训练/测试（x_test，shape）的数据是否相同。或len(test_preprocessed.columns)。

关于python - ValueError:X每个样本具有231个功能；期待1228，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/60072446/