See also the following links:

▎ENGLISH

When Accuracy Isn’t Enough, Use Precision and Recall to Evaluate Your Classification
▸ https://builtin.com/data-science/precision-and-recall

▎日 本 語

混同行列(Confusion Matrix) とは 〜 2 値分類の機械学習のクラス分類について
▸ https://qiita.com/TsutomuNakamura/items/a1a6a02cb9bb0dcbb37f