C2_W4_Decision_Tree_with_Markdown error

Course Q&A Machine Learning Specialization Advanced Learning Algorithms
1

I got this error for this line of code which works in earlier notebook:

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2

Hi @Rose_LUO ,

p1 is calculate by taken the number of examples in the subset divided by the total number of examples at a given node. Here is how to get the number of examples in the subset:
len(y[y==1])