用代码实现Apriori算法
时间: 2023-04-03 17:01:01 浏览: 133
可以使用以下代码实现Apriori算法:
```python
def apriori(transactions, min_support):
itemsets = {}
for transaction in transactions:
for item in transaction:
if item not in itemsets:
itemsets[item] =
itemsets[item] += 1
n = len(transactions)
min_count = n * min_support
frequent_itemsets = {frozenset([item]): count for item, count in itemsets.items() if count >= min_count}
while frequent_itemsets:
yield frequent_itemsets
new_itemsets = {}
for itemset in frequent_itemsets:
for item in itemsets:
if item not in itemset:
new_itemset = itemset | frozenset([item])
if new_itemset not in new_itemsets:
new_itemsets[new_itemset] =
new_itemsets[new_itemset] += 1
frequent_itemsets = {itemset: count for itemset, count in new_itemsets.items() if count >= min_count}
```
这个函数接受一个交易列表和一个最小支持度,返回一个生成器,生成频繁项集。