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I have troubles understanding understanding the split function given in this exercise (although it isn’t explained anywhere).
def split(dataset, labels, column):
data_subsets = 
label_subsets = 
counts = list(set([data[column] for data in dataset]))
for k in counts:
new_data_subset = 
new_label_subset = 
for i in range(len(dataset)):
if dataset[i][column] == k:
return data_subsets, label_subsets
I think the reason for using set() is to eliminate duplicates. The list comprehension creates a list of the values at the index column of all data in the dataset, and the set() returns a set object where duplicates are eliminated. We make it a list object again with list().
I think “Method 3” of the following page is easy to understand as an example: