计算Keras模型中的度量深度学习

Question

希望你做得很好；我有一个预测人体姿势(弯曲，躺着，坐着，站立)的模型，然后我有一个多标签分类问题，我会计算我的模型的指标(准确性，fmeasure，回忆，精度)，问题是，下面的代码在多标签分类中计算这些指标是正确的吗？

def check_units(y_true, y_pred):
    if y_pred.shape[1] != 1:
        y_pred = y_pred[:,1:2]
        y_true = y_true[:,1:2]

return y_true, y_pred

def precision(y_true, y_pred):
    y_true, y_pred = check_units(y_true, y_pred)
    true_positives = K.sum(K.round(K.clip(y_true * y_pred, 0, 1)))
    predicted_positives = K.sum(K.round(K.clip(y_pred, 0, 1)))
    precision = true_positives / (predicted_positives + K.epsilon())

return precision

def recall(y_true, y_pred):
    y_true, y_pred = check_units(y_true, y_pred)
    true_positives = K.sum(K.round(K.clip(y_true * y_pred, 0, 1)))
    possible_positives = K.sum(K.round(K.clip(y_true, 0, 1)))
    recall = true_positives / (possible_positives + K.epsilon())

return recall

def fmeasure(y_true, y_pred):
    def recall(y_true, y_pred):
        true_positives = K.sum(K.round(K.clip(y_true * y_pred, 0, 1)))
        possible_positives = K.sum(K.round(K.clip(y_true, 0, 1)))
        recall = true_positives / (possible_positives + K.epsilon())

    return recall

def precision(y_true, y_pred):
    true_positives = K.sum(K.round(K.clip(y_true * y_pred, 0, 1)))
    predicted_positives = K.sum(K.round(K.clip(y_pred, 0, 1)))
    precision = true_positives / (predicted_positives + K.epsilon())

    return precision

    y_true, y_pred = check_units(y_true, y_pred)
    precision = precision(y_true, y_pred)
    recall = recall(y_true, y_pred)

return 2*((precision*recall)/(precision+recall+K.epsilon()))

Answer 1

您可以使用sklearn中的内置函数，如下所示：

from sklearn.metrics import accuracy_score, f1_score, precision_score, recall_score

true_labels=[0,0,1,0,2,1,1,2,2,0,0,1]  # three classes 0,1,2
predicted_labels=[0,1,1,0,2,0,1,2,1,1,0,1] # predicted labels

print("Accuracy=",accuracy_score(true_labels,predicted_labels))
print("F1 Score=",f1_score(true_labels,predicted_labels, average="macro"))
print("Precision=",precision_score(true_labels,predicted_labels, average="macro"))
print("Recall=",recall_score(true_labels,predicted_labels, average="macro"))

您可以将函数的结果与这些内置函数进行比较，以对其进行测试。希望这能有所帮助。