In 2007-9 I developed some software for reading datamatrix patterns. Often these patterns were difficult to read, being indented into scratched surfaces with all kinds of reflectance properties, fuzzy chemically etched markings and so on. I used a GA to fine tune various parameters of the vision algorithms to give the best results on a database of 300 images having known properties. Parameters were things like downsampling resolution, RANSAC parameters, amount of erosion and dilation, low pass filtering radius, and a few others. Running the optimisation over several days this produced results which were about 20% better than naive values on a test set of images unseen during the optimisation phase.

这个系统完全是从零开始编写的，我没有使用任何其他库。我并不反对使用这些东西，只要它们能提供可靠的结果，但是您必须注意许可兼容性和代码可移植性问题。

Several years ago I used ga's to optimize asr (automatic speech recognition) grammars for better recognition rates. I started with fairly simple lists of choices (where the ga was testing combinations of possible terms for each slot) and worked my way up to more open and complex grammars. Fitness was determined by measuring separation between terms/sequences under a kind of phonetic distance function. I also experimented with making weakly equivalent variations on a grammar to find one that compiled to a more compact representation (in the end I went with a direct algorithm, and it drastically increased the size of the "language" that we could use in applications).

最近，我将它们用作默认假设，以此来测试由各种算法生成的解决方案的质量。这主要涉及分类和不同类型的拟合问题(即创建一个“规则”，解释审查员对数据集所做的一组选择)。

As part of my undergraduate CompSci degree, we were assigned the problem of finding optimal jvm flags for the Jikes research virtual machine. This was evaluated using the Dicappo benchmark suite which returns a time to the console. I wrote a distributed gentic alogirthm that switched these flags to improve the runtime of the benchmark suite, although it took days to run to compensate for hardware jitter affecting the results. The only problem was I didn't properly learn about the compiler theory (which was the intent of the assignment).

我本可以用现有的默认标志来播种初始种群，但有趣的是，算法发现了一个与O3优化级别非常相似的配置(但实际上在许多测试中更快)。

编辑:我还用Python写了我自己的遗传算法框架，只是使用popen命令来运行各种基准测试，尽管如果不是评估作业，我会看看pyEvolve。

我使用遗传算法(以及一些相关技术)来确定风险管理系统的最佳设置，该系统试图阻止淘金者使用偷来的信用卡来购买mmo游戏。该系统将接收数千笔具有“已知”值的交易(欺诈与否)，并找出最佳设置组合，以正确识别欺诈交易，而不会产生太多误报。

We had data on several dozen (boolean) characteristics of a transaction, each of which was given a value and totalled up. If the total was higher than a threshold, the transaction was fraud. The GA would create a large number of random sets of values, evaluate them against a corpus of known data, select the ones that scored the best (on both fraud detection and limiting the number of false positives), then cross breed the best few from each generation to produce a new generation of candidates. After a certain number of generations the best scoring set of values was deemed the winner.

创建用于测试的已知数据语料库是该系统的阿喀琉斯之踵。如果你等待退款，你在试图回应欺诈者时就会落后几个月，所以有人必须手动审查大量交易，以建立数据库，而不必等待太长时间。

这最终确定了绝大多数的欺诈行为，但在最容易欺诈的项目上，这一比例无法低于1%(考虑到90%的交易可能是欺诈，这已经相当不错了)。

我用perl完成了所有这些。在一个相当旧的linux机器上运行一次软件需要1-2个小时(20分钟通过WAN链路加载数据，其余时间用于处理)。任何给定代的大小都受到可用RAM的限制。我会一遍又一遍地运行它，稍微改变参数，寻找一个特别好的结果集。

总而言之，它避免了手动调整数十个欺诈指标的相对值所带来的一些失误，并且始终能够提出比我手动创建的更好的解决方案。AFAIK，它仍然在使用(大约3年后我写了它)。

在我的婚宴上，我使用GA来优化座位分配。80位客人超过10张桌子。评估功能是基于让人们和他们的约会对象在一起，把有共同点的人放在一起，把观点完全相反的人放在不同的桌子上。

我运行了几次。每次我都有九张好桌子，还有一张都是怪球。最后，我妻子安排了座位。

我的旅行推销员优化器使用了一种新的染色体到行程的映射，这使得繁殖和变异染色体变得很简单，没有产生无效行程的风险。

更新:因为一些人问了…

以任意但一致的顺序(如按字母顺序排列)的客人(或城市)数组开始。称之为参考溶液。把客人的座位号看作是他/她的座位号。

我们没有尝试直接在染色体中编码这种顺序，而是编码将参考溶液转化为新溶液的指令。具体来说，我们将染色体视为数组中要交换的索引列表。为了解码染色体，我们从参考溶液开始，并应用由染色体指示的所有交换。交换数组中的两个条目总是会得到一个有效的解决方案:每个来宾(或城市)仍然只出现一次。

因此，染色体可以随机生成，突变，并与其他染色体交叉，总是会产生有效的解决方案。

足球引爆。我建立了一个GA系统来预测每周澳式足球比赛的结果。

A few years ago I got bored of the standard work football pool, everybody was just going online and taking the picks from some pundit in the press. So, I figured it couldn't be too hard to beat a bunch of broadcast journalism majors, right? My first thought was to take the results from Massey Ratings and then reveal at the end of the season my strategy after winning fame and glory. However, for reasons I've never discovered Massey does not track AFL. The cynic in me believes it is because the outcome of each AFL game has basically become random chance, but my complaints of recent rule changes belong in a different forum.

该系统基本上考虑了进攻强度、防守强度、主场优势、每周的改进(或缺乏)以及这些方面的变化速度。这为每支球队在整个赛季中建立了一组多项式方程。可以计算给定日期的每场比赛的获胜者和分数。我们的目标是找到最接近过去所有游戏结果的系数集，并使用该集合来预测接下来几周的游戏。

在实践中，该系统将找到能够准确预测过去90%以上游戏结果的解决方案。然后，它会成功地为即将到来的一周(即不在训练集中的那一周)挑选大约60-80%的比赛。

结果是:略高于中游水平。没有巨额奖金也没有能打败维加斯的系统。不过很有趣。

我从零开始构建一切，没有使用任何框架。