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How does the Amazon Recommendation feature work?
...ch an algorithm would probably involve tracking groups of items frequently ordered together, and then using that data to recommend other items in the group when a customer purchases some subset of the group.
Another possibility would be to track the frequency of item B being ordered within N days a...
What are some (concrete) use-cases for metaclasses?
... evaluate the class body into a mapping other than a dict, thus supporting ordered attributes, overloaded attributes, and other wicked cool stuff:
import collections
class Metaclass(type):
@classmethod
def __prepare__(meta, name, bases, **kwds):
return collections.OrderedDict()
...
Drop all the tables, stored procedures, triggers, constraints and all the dependencies in one sql st
...= (SELECT TOP 1 [name] FROM sysobjects WHERE [type] = 'P' AND category = 0 ORDER BY [name])
WHILE @name is not null
BEGIN
SELECT @SQL = 'DROP PROCEDURE [dbo].[' + RTRIM(@name) +']'
EXEC (@SQL)
PRINT 'Dropped Procedure: ' + @name
SELECT @name = (SELECT TOP 1 [name] FROM sysobjects WH...
Which Java Collection should I use?
...t, non-synchronized collections
Collection: An interface representing an unordered "bag" of items, called "elements". The "next" element is undefined (random).
Set: An interface representing a Collection with no duplicates.
HashSet: A Set backed by a Hashtable. Fastest and smallest memory usage, w...
Storing time-series data, relational or non?
...has to handle ~3 million measures with a 1 minute frequency? How would you order the PK for such a table? Wouldn't Device, Metric, DateTime create fragmentation and force the RDBMS to lots of page split? Instead putting DateTime first would reduce fragmentation (I'm assuming time ordered inserts) bu...
Is it possible to import a whole directory in sass using @import?
...in another answer "If you import a directory, how can you determine import order? There's no way that doesn't introduce some new level of complexity."
Some would argue that organizing your files into directories can REDUCE complexity.
My organization's project is a rather complex app. There are ...
How to maintain a Unique List in Java?
... low) if iteration performance is important.
When iterating a HashSet the order of the yielded elements is undefined.
LinkedHashSet
Hash table and linked list implementation of the Set interface, with predictable iteration order. This implementation differs from HashSet in that it maintains a doub...
REST URI convention - Singular or plural name of resource while creating it
...tomate), mainly because code is what is going to be at both ends.
GET /orders <---> orders
POST /orders <---> orders.push(data)
GET /orders/1 <---> orders[1]
PUT /orders/1 <---> orders[1] = data
GET /orders/1/lines <---> orders[1...
Database sharding vs partitioning
...itioning. Partition pruning can often improve query performance by several orders of magnitude. For example, suppose an application contains an Orders table containing a historical record of orders, and that this table has been partitioned by week. A query requesting orders for a single week would o...
Why does the order in which libraries are linked sometimes cause errors in GCC?
Why does the order in which libraries are linked sometimes cause errors in GCC?
9 Answers
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