calcShannonEntcalcShan()函数错误

[zhanzecheng]

self-learning-c45algorithm-final.ipynb文件中
应该改为：
if currentLabel not in labelCounts.keys():
labelCounts[currentLabel] = 1

[HenryLiu0]

@zhanzecheng 这个函数并没有错，因为在下一行代码中为它加了1

if currentLabel not in labelCounts.keys():
    labelCounts[currentLabel] = 0
labelCounts[currentLabel] += 1