Pandas標籤統計

數據來源：https://www.kaggle.com/c/rsna-intracranial-hemorrhage-detection/data —— stage_2_train.csv

API

• groupy
• unstack
• value_counts

csv data

查看 label

label = traindf.Label.values
label

array([0, 0, 0, …, 0, 0, 0])

分解ID 和subtype

traindf = traindf.ID.str.rsplit("_", n=1, expand=True)
traindf.head()

合併label

traindf.loc[:, "label"] = label
traindf.head()

0,1 列名重命名

traindf = traindf.rename({0: "id", 1: "subtype"}, axis=1)
traindf.head()

統計標籤類別數

subtype_counts = traindf.groupby("subtype").label.value_counts()

unstack

subtype_counts.unstack()