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How does the Amazon Recommendation feature work?
...ly, but one component of such 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 be...
List of installed gems?
...cal_gems
Gem::Specification.sort_by{ |g| [g.name.downcase, g.version] }.group_by{ |g| g.name }
end
Because local_gems relies on group_by, it returns a hash of the gems, where the key is the gem's name, and the value is an array of the gem specifications. The value is an array of the instances o...
Simple regular expression for a decimal with a precision of 2
... # Require one or more numbers
( # Begin optional group
\. # Point must be escaped or it is treated as "any character"
[0-9]{1,2} # One or two numbers
)? # End group--signify that it's optional with "?"
...
Get names of all keys in the collection
...ert all top key-value pairs into document arrays, followed by $unwind and $group with $addToSet to get distinct keys across the entire collection. (Use $$ROOT for referencing the top level document.)
db.things.aggregate([
{"$project":{"arrayofkeyvalue":{"$objectToArray":"$$ROOT"}}},
{"$unwind":"...
How to see JavaDoc in IntelliJ IDEA? [duplicate]
...
You don’t have to expand the “Editor” menu group. You will not find this setting in one of the its entries. You have to select the Editor “group” itself and it will show a settings page on the right where the option is.
– Matthias Ronge
...
split string only on first instance of specified character
...his example our separator (matching _(.+)) is _luck_buddy and the captured group (within the separator) is lucky_buddy. Without the capturing parenthesis the luck_buddy (matching .+) would've not been included in the result array as it is the case with simple split that separators are not included i...
Finding the id of a parent div using Jquery
...had something already... in my case i used $("#" + id).closest("div.form-group") to find the parent div who had the form-group class.
– cabaji99
May 19 '15 at 13:56
...
Enum String Name from Value
...in overloads using IFormatProvider are deprecated. ToString() is fine. See groups.google.com/group/DotNetDevelopment/browse_thread/thread/…
– AndyM
Apr 15 '09 at 9:37
...
Simple Digit Recognition OCR in OpenCV-Python
... a well defined perfect font. For instance, the digits 0, 4, 6, 9 form one group, the digits 1, 2, 3, 5, 7 form another, and 8 another. This group is given by the euler number. Then "0" has no endpoints, "4" has two, and "6" and "9" are distinguished by centroid position. "3" is the only one, in the...
How to generate the “create table” sql statement for an existing table in postgreSQL
...HERE a.attnum > 0
AND NOT a.attisdropped
GROUP BY a.attrelid) e
ON a.attrelid=e.attrelid
WHERE a.attnum > 0
AND NOT a.attisdropped
ORDER BY a.attnum
LOOP
IF column_record.attnum = 1 THEN
v_table_ddl:=...