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[英]splitting data into test and train, making a logistic regression model in pandas
[英]How to make predictions on a logistic regression model with a separate df for train and test data
我正在研究邏輯回歸 model。 我從兩個獨立的 CSV 文件開始,一個用於訓練數據,一個用於測試數據。 我創建了兩個單獨的數據框,每個數據集一個。 我能夠很好地擬合和訓練 model,但是當我嘗試使用測試數據進行預測時出現錯誤。
我不確定我是否正確設置了 y_train 變量,或者是否還有其他問題。 運行預測時,我收到以下錯誤消息。
這是模型的設置和代碼”
#Setting x and y values
X_train = clean_df_train[['account_length','total_day_charge','total_eve_charge', 'total_night_charge',
'number_customer_service_calls']]
y_train = clean_df_train['churn']
X_test = clean_df_test[['account_length','total_day_charge','total_eve_charge', 'total_night_charge',
'number_customer_service_calls']]
y_test = clean_df_test['churn']
#Fitting / Training the Logistic Regression Model
logreg = LogisticRegression()
logreg.fit(X_train, y_train)
LogisticRegression(C=1.0, class_weight=None, dual=False, fit_intercept=True,
intercept_scaling=1, max_iter=100, multi_class='warn',
n_jobs=None, penalty='l2', random_state=None, solver='warn',
tol=0.0001, verbose=0, warm_start=False)
#Make Predictions with Logit Model
predictions = logreg.predict(X_test)
#Measure Performance of the model
from sklearn.metrics import classification_report
#Measure performance of the model
classification_report(y_test, predictions)
1522 """
1523
-> 1524 y_type, y_true, y_pred = _check_targets(y_true, y_pred)
1525
1526 labels_given = True
E:\Users\davidwool\Anaconda3\lib\site-packages\sklearn\metrics\classification.py in _check_targets(y_true, y_pred)
79 if len(y_type) > 1:
80 raise ValueError("Classification metrics can't handle a mix of {0} "
---> 81 "and {1} targets".format(type_true, type_pred))
82
83 # We can't have more than one value on y_type => The set is no more needed
ValueError: Classification metrics can't handle a mix of continuous and binary targets
這是我正在使用的數據的負責人。 流失列是完全空白的,因為這是我想要預測的。
clean_df_test.head()
account_length total_day_charge total_eve_charge total_night_charge number_customer_service_calls churn
0 74 31.91 13.89 8.82 0 NaN
1 57 30.06 16.58 9.61 0 NaN
2 111 36.43 17.72 8.21 1 NaN
3 77 42.81 17.48 12.38 2 NaN
4 36 47.84 17.19 8.42 2 NaN
這里也是dtypes。
clean_df_test.dtypes
account_length int64
total_day_charge float64
total_eve_charge float64
total_night_charge float64
number_customer_service_calls int64
churn float64
dtype: object
主要問題是我習慣於在一個數據集上使用 sklearn 的train_test_split()
function,因為這里我有 2 個單獨的數據集,所以我不確定將我的 y 測試設置為什么。
通過查看clean_df_test.head()
問題變得很明顯。 我可以看到churn
列中有 null 值。
因此, y_test
包含 null 值,並將其作為y_true
傳遞給classification_report()
,您正在使 function 將空值與整數進行比較,這會引發錯誤。
要解決此問題,請嘗試刪除churn
為NaN
的行並像以前一樣運行代碼的 rest。
# Drop records where `churn` is NaN
clean_df_test.dropna(axis=0, subset=['churn'], inplace=True)
# Carry on as before
X_test = clean_df_test[['account_length','total_day_charge','total_eve_charge', 'total_night_charge',
'number_customer_service_calls']]
y_test = clean_df_test['churn']
發現此問題的另一種方法是查看clean_df_test
的數據類型。 從 output 開始, churn
的類型是float
,如果它完全用 1 和 0 填充,則不應該是這種情況!
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