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Outer Product

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还没有人认领这个 Issue。

评估

难度
4/5
预计耗时
3-5 天
新手友好度
35/100
Issue 类型
功能
描述清晰度
基本清楚
活跃度
停滞
技术栈
python
领域
data, stream-processing

调研方向

Start from the Stream and product usage shown in the issue, then inspect the stream operator implementation and existing tests for related combinators. Determine how the outer product should behave as values arrive and how completion is represented; done means the paired example produces the nine multiplication results without an unresolved memory strategy.

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描述

Here is my attempt at an example:

from streams import Streams
from operator import mul
s1 = Stream()
s2 = Stream()

op = s1.product(s2, mul)
L = op.sink_to_list()
a = [1, 2, 3]
b = [4, 5, 6]

for x, y in zip(a, b):
    s1.emit(x)
    s2.emit(y)
print(L)

[4, 5, 6, 8, 10, 12, 12, 15, 18]

The best way that I can kind of come up with this is to stash all but one of the streams into a list and then for each incoming piece of data perform an itertools.product on the resulting iterable and push it into some function. I'm not so crazy about this as it means we end up storing a bunch of stuff in memory which seems un-stream like.

主要语言
Python
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派生
149
平均合并
17 小时 39 分钟
30 天内合并 PR
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