如何散列列表? [英] How to hash lists?
问题描述
示例(D = 4,k = 2):
118 | 27 | 1002 | 225
128 | 85 | 2000 | 8700
512 | 88 | 2500 | 10000 $ b $ 600 | 97 | 6500 | 24000
800 | 99 | 7024 | 25874
第一列应作为散列函数的输入,并返回一个存储桶的编号。
令我感到困惑的是,我们不寻求函数来散列数字,而是寻找列,即列表
有什么想法吗?
我正在使用 python 如果那么重要
解决方案>在[4]中:hash(l)
TypeError:不可用类型:'list'
$ b $ hash(元组(l))%k#29000
输出[5]: 70846
Lists are not hashable. However, I am implementing LSH and I am seeking for a hash function that will correspond a list of positive integers (in [1, 29.000]) to k buckets. The number of lists is D, where D > k (I think) and D = 40.000, where k is not yet known (open to suggestions).
Example (D = 4, k = 2):
118 | 27 | 1002 | 225
128 | 85 | 2000 | 8700
512 | 88 | 2500 | 10000
600 | 97 | 6500 | 24000
800 | 99 | 7024 | 25874
The first column should be given as input to the hash function and return the number of a bucket.
What confuses me is that we do not seek for a function to hash a number, but a column, i.e. a list of positive integers.
Any ideas please?
I am using python if that matters
You can just convert it in a hashable type before :
In [4]: hash(l)
TypeError: unhashable type: 'list'
hash(tuple(l)) % k # 29000
Out[5]: 70846
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