用户提问: ai量化指标源码
Ai回答: 在AI领域,量化指标源码通常指的是用于评估机器学习模型性能的代码。这些代码可以是开源的库函数,也可以是自定义的函数。以下是一些常用的量化指标及其Python实现:
1、均方误差(Mean Squared Error, MSE):
python
def mse(y_true, y_pred):
return np.mean((y_true y_pred) 2)
2、均方根误差(Root Mean Squared Error, RMSE):
python
def rmse(y_true, y_pred):
return np.sqrt(np.mean((y_true y_pred) 2))
3、平均绝对误差(Mean Absolute Error, MAE):
python
def mae(y_true, y_pred):
return np.mean(np.abs(y_true y_pred))
4、R平方(R-squared):
python
def r2_score(y_true, y_pred):
ss_res = np.sum((y_true y_pred) 2)
ss_tot = np.sum((y_true np.mean(y_true)) 2)
return 1 (ss_res / ss_tot)
5、精确度(Precision):
python
def precision_score(y_true, y_pred):
tp = np.sum((y_true == 1) & (y_pred == 1))
fp = np.sum((y_true == 0) & (y_pred == 1))
return tp / (tp + fp)
6、召回率(Recall):
python
def recall_score(y_true, y_pred):
tp = np.sum((y_true == 1) & (y_pred == 1))
fn = np.sum((y_true == 1) & (y_pred == 0))
return tp / (tp + fn)
7、F1分数(F1 Score):
python
def f1_score(y_true, y_pred):
precision = precision_score(y_true, y_pred)
recall = recall_score(y_true, y_pred)
return 2 * (precision * recall) / (precision + recall)
以上代码假设`y_true`和`y_pred`分别是真实值和预测值的数组。
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提问时间: 2025-04-24 11:49:46
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