winnowing | Python implementation of the Winnowing

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A Python implementation of the Winnowing (local algorithms for document fingerprinting)

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Community Discussions

Trending Discussions on winnowing

How much impact will NGINX rewrite rules have on performance

how to get the rightmost index value from an array with the same values using php

How to determine if 2 or more words are contained within a variety of strings

INSERT or SELECT strategy to always return a row?

Track original position of transformed string in java

QUESTION

How much impact will NGINX rewrite rules have on performance

Asked 2019-Dec-12 at 13:39

I have a website served by NGINX, with ~1000 rewrite rules which ensure pages which existed before the website was completely rewritten are honoured.

Things like:

...

ANSWER

Answered 2019-Dec-12 at 13:39

A thousand of NGINX "regular expression" locations can absolutely have a performance penalty. Specifically how much this would be in time measurement, depends on the hardware and workload of your server.

Note that most of the regular locations you mentioned can be rewritten to exact matching, like I mention here:

E.g. instead of:

Source https://stackoverflow.com/questions/59284921

QUESTION

how to get the rightmost index value from an array with the same values using php

Asked 2019-Jul-22 at 08:25

I'm making a program to take fingerprint values using a winnowing algorithm. which is where I have to take the smallest value from an array. but not only the smallest, there are conditions where if you find the same value, the rightmost value will be taken along with the index value. example array (3,5,5,8,6,7). from this example, I want to take the index of the second number 5, which is index 2, not index 1.

but when I try to get the same value as the rightmost position use the function min () in php, but the one I get is always the leftmost position.

I expect the output of

...

ANSWER

Answered 2019-Jul-22 at 07:11

Use the value from an array as an index to filter out the most right value

Source https://stackoverflow.com/questions/57140617

QUESTION

How to determine if 2 or more words are contained within a variety of strings

Asked 2018-Mar-05 at 15:21

I have a situation where a value contains multiple fields, and provide a search bar where a user may enter phrases that could be split between those fields.

The following is a short sample from a playground illustrating what I would like to accomplish.

...

ANSWER

Answered 2018-Mar-05 at 15:21

As a fast solution you can do following:

Source https://stackoverflow.com/questions/49102667

QUESTION

INSERT or SELECT strategy to always return a row?

Asked 2017-Oct-08 at 05:08

Using Postgres 9.6, I have followed the strategy recommended in https://stackoverflow.com/a/40325406/435563 to do an INSERT or SELECT and return the resulting id:

...

ANSWER

Answered 2017-Oct-06 at 08:11

https://www.postgresql.org/docs/9.5/static/sql-insert.html

ON CONFLICT DO UPDATE guarantees an atomic INSERT or UPDATE outcome; provided there is no independent error, one of those two outcomes is guaranteed, even under high concurrency.

this is regarding the lock youmention in your updated post. Now regarding the initial question with returning row - I read it incarefully first. Now that I saw the where false - with this clause not always you have a row returned. eg:

Source https://stackoverflow.com/questions/46586793

QUESTION

Track original position of transformed string in java

Asked 2017-May-10 at 17:48

I am working on an implementation of a source code plagiarism algorithm(winnowing algorithm) and have a problem where I need some help.

Example: I have a string

...

ANSWER

Answered 2017-May-10 at 17:48

If you want the positions from the original string, you can't remove the non-letters first, or the information is lost. You'll either need to find the kgrams in the original string directly (more CPU time) or store the original position of each letter along with the modified string (more memory space).

Here's an implementation of the latter:

Source https://stackoverflow.com/questions/43879185

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