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I'm looking for a module - if it exists - that is an API for creating a traditional tree data structure (like a decision tree) and saving and loading it from a data source (like a MongoDB document). Ideally this API would allow splicing trees at any node and then resaving them to the DB and also retrieval of any node via an ID.
I've found the following:
decision-tree: too narrow a definition and no DB support.
simple-tree: no DB support
tree: no documentation
tree-kit: utilities but not a traditional tree data structure from what I can see.
tree-data: no documentation that I can find
None of these seem to be a full solution for my decision-tree needs. And it is quite possible that I'm approaching this the wrong way.
Suggestions?
EDIT:
Found tree-model and it seems promising, but still no API for interaction with a DB. Perhaps I will write one.
After looking into this and not finding a substantial solution for what I wanted, I wrote my own:
mongo-tree
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I was told once there is a book that shows you how to make a database from scratch using sed, awk, and the Linux filesystem. I thought I had the name, but now I cannot find it. What is this book called?
Edit:
My understanding is this book was meant for learning how databases work, and how to build your own entirely from scratch using awk and the filesystem. From how it was explained, you could build your own version of /rdb, then when you finished you could just use /rdb itself, but now you'd know how it was made.
So, at the end of the book, you'd have almost completely remade /rdb yourself.
Is it "Unix Relational Database Management: Application Development in the Unix Environment (/RDB)" http://www.amazon.com/exec/obidos/ISBN=013938622X/cbbrownecompu-20/ ?
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This may be a question that is not suitable for stackoverflow, but I had no other better place to ask it. I was wondering if there are any known tools (non-commercial) that can be used to solve the homophone confusions such as these in a sentence?
it's vs its
you're vs your
I am new to NLP and I haven't used any of the known tools. Tried to search for these in google but nothing useful shows up. Are there any parts in NLTK or CoreNLP that cover this?
I have no experience with this topic but I found a how to PDF that may be of some use to you.
How to solve homophone problems
It's no complete solution, but LanguageTool has some rules for this. See the rule file and search for rulegroup id="IT_IS"(disclaimer: I'm the maintainer of LanguageTool). After the Deadline also uses a rule-based approach, only that it tries to avoid useless suggestions by filtering its suggestion against a large n-gram database.
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I'm planning to use Node for my next project, because it seems to be a good fit for the problem I'm solving.
One thing I need to figure out is optimistic and pessimistic locking. http://guides.rubyonrails.org/active_record_querying.html#locking-records-for-update
Say, the user has a balance of 1. Two Node instances make requests concurrently to withdraw 1. The two requests could pass the check of sufficient balance at the same time, thus making two successful withdrawals resulting in a balance of -1.
Rails provides a wrapper around Postgres transactional and locking features. Does some kind of similar wrapper exist for Node?
How do you solve this in Node/Postgresql?
I know this is a database feature, but I wonder if Node or some library provides a abstraction away from writing raw SQL queries?
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I'm developing an Node.js app that stores HTML documents in a MongoDB database and want to provide full text search capabilities. From what I can see the full text search included in MongoDB expects documents to be plain text and therefore isn't suitable for indexing my html documents. Is that assumption correct and if so what do folks recommend for this.
From reading other SO posts Elastic Search seems to be the most suggested path. I can't say I'm all that happy about bringing a Java app into the picture though. Also having a completely separate app is not my ideal scenario.
You can throw some regex at the HTML and try to strip the markup from the HTML yourself. The output can be indexed by MongoDB.
That is probably easier to develop than using a search tool such as ES or Solr (which indeed is out of scope here), but it won't get you as far: simply stripping the HTML means that contextual information is lost, and invalid HTML can lead to trouble.
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I am looking to make a prototype of a UML differencing tool. What open source visualization tool kit exist that allow me to display UML diagrams?
Yet, I still need to be able to make personal edits the display. (Ie. refocusing, and drop down lists, additional displays.)
I have looked at Zest and Perfuse. But neither of these applications have a way to display a UML. If they do work, where are examples of them displaying UMLs?
you may want to have a look at GEF. As far as I know, ArgoUML is based on this framework.
There are several open source UML tools for Eclipse listed here along with their license.
For the diff part, you should check EMFCompare and this list of model versioning tools since they could be reused in your project