ValueError: classification_report的未知标签类型

from sklearn.preprocessing import LabelEncoder
from sklearn.metrics import classification_report

# 假设这是你的真实标签和预测标签
y_true = ['cat', 'dog', 'bird', 'cat']
y_pred = ['cat', 'dog', 'fish', 'cat']  # 'fish' 是一个未知标签

# 使用LabelEncoder来编码标签
label_encoder = LabelEncoder()
encoded_y_true = label_encoder.fit_transform(y_true)
encoded_y_pred = label_encoder.transform(y_pred)

# 确保没有未知标签
unique_labels = set(encoded_y_true).union(set(encoded_y_pred))

# 过滤掉不在unique_labels中的标签
filtered_y_true = [label for label in encoded_y_true if label in unique_labels]
filtered_y_pred = [label for label in encoded_y_pred if label in unique_labels]

# 现在可以安全地调用classification_report
print(classification_report(filtered_y_true, filtered_y_pred))