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I found that quite a few tags are present at each of these sites in the SE universe:

For example:

  • reinforcement-learning (AI, DS, CV)
  • neural-network(s) (AI, DS, CV)
  • deep-learning (AI, DS, CV)
  • etc

Considering the descriptions of these SE sites doesn't help in drawing clear boundaries:

[Artificial Intelligence] Q&A for people interested in conceptual questions about life and challenges in a world where "cognitive" functions can be mimicked in purely digital environment.

[Data Science] Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field.

[Cross Validated] Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization.

And neither do the tag descriptions, for example reinforcement-learning:

[Artificial Intelligence] For questions related to learning controlled by external positive reinforcement or negative feedback signal or both, where learning and use of what has been thus far learned occur concurrently.

[Data Science] Area of machine learning concerned with how software agents ought to take actions in an environment so as to maximize some notion of cumulative reward.

[Cross Validated] A set of dynamic strategies by which an algorithm can learn the structure of an environment online by adaptively taking actions associated with different rewards so as to maximize the rewards earned.

While the site description for AI seems to invite only conceptual questions rather than specific or detailing ones, surveying the posted questions reveals a different trend.

For example tagged reinforcement-learning at Artificial Intelligence:

These questions are quite specific and not conceptual (in a sense that they ask about implementation details or aspects specific to a problem).

Surveying the first few pages of the reinforcement-learning tag at Data Science on the other hand created the impression of an excess of conceptual questions on that site and the same is observed for Cross Validated.

All these sites support MathJax rendering, in favor of conceptual questions.

Questions

Now the obvious dilemma (actually "trilemma") is, if I have a question about any of these shared-tag topics, ...

  1. ... which SE site should I prefer for posting that question?
  2. ... is there a preference regarding conceptual / (implementation-) specific questions?
  3. ... is cross-posting considered bad manners?

Also are there any attempts in merging these SE sites into a single one, in order to merge the corresponding knowledge and competences?

Note

I posted this questions here, at Cross Validated Meta, because Cross Validated appeared topmost at SE sites, hosting most of the questions, considering the above three candidates.

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    $\begingroup$ I can appreciate why this is somewhat confusing. My personal feeling is that upwards of 85% of the content on DSCI.SE and AI.SE is wholly on-topic here, and that we are needlessly duplicating that content and spreading expertise across these three sites. The remaining 15% (or less) accounts for the slivers of content which are on-topic on DSCI.SE and AI.SE that are not also on-topic here, mainly related to programming vice statistics (broadly conceived). The thread stats.meta.stackexchange.com/questions/2253/… seems closely related to this one. $\endgroup$ – Sycorax Nov 26 '18 at 18:01
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    $\begingroup$ I empathize with your consternation. I agree w/ @Sycorax. One additional point is that, re: $3$, yes cross-posting is explicitly frowned upon. $\endgroup$ – gung Nov 27 '18 at 4:57
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    $\begingroup$ Note that you ought to be able to find explanations of what's considered on-topic in the help pages for each site: ai.stackexchange.com/help/on-topic, stats.stackexchange.com/help/on-topic, & datascience.stackexchange.com/help/on-topic. But DS have been rather lackadaisical, despite some prodding on Meta - their page merely contains 5 examples of question titles (4 of which suggest the questions might well be perfectly on-topic at CV). $\endgroup$ – Scortchi Dec 12 '18 at 17:05
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TL;DR

Machine learning, deep learning and reinforcement learning are all on-topic here, but we ask that questions not be primarily concerned with programming.

Preamble

I'm not active on DSCI.SE or AI.SE so I have no deep understanding of what is on-topic on those fora. However, I have been active on stats.SE for several years and I regularly participate in the review queues and meta.stats.SE. Moreover, my specialization is machine learning, neural networks and I've started learning about reinforcement learning, so I feel that I can speak to your question with respect to stats.SE.

Machine learning is a subfield of statistics, and this is a statistics forum

I've said it before and I'll say it again, "machine learning" and "data science" are terms that you use in place of "statistics" when you want to double the fees on your rate card. Machine learning is just another kind of statistical specialization, among other specializations such as time series analysis or mixed effects modeling. Despite its novelty, machine learning is concerned with core statistical concepts such as random variables, quantifying uncertainty, prediction and forecasts. In this light, questions about machine learning are squarely on-topic here.

Some words about code

The main caveat to keep in mind is that questions which are primarily concerned with how to accomplish some task using a programming language are not on-topic here. This is because Stack Overflow already exists, and there would be no point in duplicating all of the "how do I __ in R?" and "how do I __ in sklearn?" questions here. These questions already have high-quality answers from programmers; why would you want another answer from a statistician? Our core competency is statistics, not programming.

Most modern statistics involves some level of computer programming, so sometimes it is unclear where to draw the line, or the quoted code is purely incidental, or there are other reasons that a question that includes code is more about statistics than it is about programming. It's a subtle issue, and I encourage other reviewers to be thoughtful when considering whether a question that contains a code block is better open than closed.

It's not clear where on the programming-statistics continuum your question falls. If you're trying to fix a bug, or improve the efficiency of code, that's probably off-topic at stats.SE, but if you have a question about statistics and code is more-or-less incidental or expository to your statistical question, then it's probably on-topic.

One test I use when questions in the Close queue is whether the question is completely answered with some computer code; if it is, then the question is probably more about programming than statistics.

Cross-posting is frowned upon

Asking the exact same question in two or more fora is frowned upon because it duplicates effort.

The only reason to ask similar questions in two places is because you want to have answers from clearly distinct perspectives. Glen_b came up with a nice example for this: suppose you ask a question about building a fence in your yard on DIY.SE (because you learn about home improvement), but you're not sure about the legal implications (because you don't want to annex some of your neighbor's yard); you ask a similar question on law.SE. This is fine, but do make it clear that you're interested in two distinct answers, one about home improvement and one about minimizing legal risk.

Why do users face this trilemma?

The creation of three distinct fora which largely overlap is very confusing to new users. It's the direct result of the Area51 process, which allows new SE websites to be created without the intervention of common sense.

Simultaneously, hapless undergraduates are convinced that because "machine learning" and "data science" are courses taught in the computer science department of their universities, they must be wholly unique fields of study with only a historical relationship to the math or statistics departments; when these students are loosed upon the world, they carry with them their policing of disciplinary boundaries and zealously enforce their misconceptions when they graduate.

It's also confusing to veteran users like me, because SE was designed around creating a durable repository of high-quality questions and answers; duplicate questions are addressed by closing questions as duplicates of the existing, high-quality content. Creating nearly-identical fora directly undermines that objective.

My view is that SE websites should strive to be as mutually exclusive as possible. The SE team even built a feature to accommodate confused users: if users post a question in the wrong place, it can easily be migrated to the correct forum.

AI.SE and DSCI.SE would be valuable additions to the SE network if their focus were on the topics not covered by stats.SE. I'm hard-pressed to find a question that is on-topic here but not on-topic at DSCI.SE; does this imply that we should duplicate every question and every answer on DSCI.SE? If not, why does it exist? If so, why does it exist? As it stands, the only reason for DSCI.SE to exist is to accommodate users unfamiliar with the term "statistics," but we can easily fix that by redirecting DSCI.SE.com to stats.SE.com.

Occasionally, this topic has been discussed on meta.DSCI.SE and meta.AI.SE, and it is common to see users of those websites claim that machine learning, neural networks, deep learning and reinforcement learning are not on-topic on stat.SE. These users are simply wrong. Machine learning is statistics, and stat.SE is a statistics forum. (Examples of such meta threads are easy enough to find; I don't really want to provoke any specific users by naming them here.)

When considering arguments in favor of DSCI.SE, one quickly realizes that the same arguments can argue in favor of creating time-series.SE, spatial-data.SE, bayes.SE, missing-data.SE, regression.SE, probability.SE and a specialized SE website for every other statistical topic. I can see no useful purpose for such fine-grained distinctions. Moreover, time-series.SE and spatial-data.SE leave no obvious home for spatio-temporal questions, which can find a home in neither because it includes both topics. Users will be fragmented across the statistical archipelago; total traffic to each website will be much smaller; more questions will be posted to the wrong fora to the consternation of all involved; all users will chafe under the pointless friction of this system and depart for Reddit, Twitter, Quora or Yahoo! Answers.

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    $\begingroup$ Excellent analysis. On the very last point, I think SE has a long way to do before it is no better than Reddit, Twitter and Quora as a place to get technical answers. (I didn't even know there was a Yahoo! Answers.) $\endgroup$ – Nick Cox Nov 27 '18 at 18:16
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    $\begingroup$ "[T]he Area51 process... allows new SE websites to be created without the intervention of common sense." $\endgroup$ – gung Nov 28 '18 at 14:37
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    $\begingroup$ This answer deserves a bounty. $\endgroup$ – gung Nov 28 '18 at 14:37
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I quite regularly visit SE DataScience, SE StackOverflow and SE CrossValidated.

I often have the impression that some question fits best on another SE platform but usually the person is kindly asked to place the question elsewhere.

The term data science per se generates some misunderstanding, but I think we can agree that it has now acquired much more sense.

Looking at the famous McConway diagram, which has now been updated or simply modified by several people, the field is defined according to the interplay of three main sets of skills which are partly related to different SE platforms: coding (SE StackOverflow), math (SE Mathematics) & statistics (SE CrossValidated), subject expertise.

For me a good question on SE DataScience is one related to the availability or best use of routines/packages for doing some task.

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