The string similarity formula originated to satisfy listed here demands:
- A real expression of lexical similarity – strings with tiny variations must named becoming similar. Specifically, a significant sub-string convergence should point to a top amount of similarity involving the chain.
- A robustness to changes of keyword purchase- two strings that incorporate the exact same phrase, however in another type of purchase, should-be seen as getting comparable. In contrast, if a person sequence is simply a random anagram regarding the characters within the various other, it should (usually) become recognized as dissimilar.
- Code independence – the formula should function not just in English, and in many different dialects.
Solution
The similarity are calculated in three steps:
- Partition each sequence into a summary of tokens.
- Processing the similarity between tokens simply by using a sequence edit-distance formula (expansion function: semantic similarity dimension by using the WordNet library).
- Processing the similarity between two token lists.
There is certainly another debate to suit your reference.
A far better similarity positioning algorithm for variable size strings
Cheers all for the assistance and guide.
Martin Xie [MSFT] MSDN Community assistance | Feedback to all of us Have or demand signal test from Microsoft Kindly take the time to draw the responds as solutions should they help and unmark them when they render no assistance.
- Marked as answer by Martin_Xie Monday, Sep 26, 2011 8:48 in the morning
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As an example “a_logfile.txt” and “logfile_a.txt” must be most similiar and aswell “loga_file.txt” and “logfile.text” however “myText.txt” and “logfile.txt”
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Ok I give it a try once more 🙂
Better i want to compare filenames and i want to get a share numbers in just how similiar these are generally. We do not determine if this is feasible whatsoever.
As an example a filename “a_filename.txt” and “filename_a.txt” is really similiar for all of us but how am I able to obtain the same lead programmatically.
Another sample filename “file_abc_.txt” and fil_abc_e.txt” is similiar but again how can i obtain the outcome programmaticaly
That’s probably more difficult than it seems initially.
Take a look at http://en.wikipedia.org/wiki/String_metrics and stick to a few of the backlinks.
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This post demonstrates a great choice about: how-to Compute the similarity between two words/strings. The formula was created in C# and you can install the demonstration internally.
The string similarity algorithm originated to fulfill the next demands:
- A genuine reflection of lexical similarity – strings with little distinctions must recognized as getting similar. Particularly, an important sub-string overlap should indicate a higher level of similarity between the strings.
- A robustness to changes of keyword purchase- two chain that have the exact same keywords, in an alternate order, must certanly be recognized as becoming similar. Alternatively, if an individual sequence simply a random anagram on the characters within the more, this may be should (usually) end up being recognized as dissimilar.
- Language independency – the formula should work not only in English, but also in several languages.
Option
The similarity are computed in three procedures:
- Partition each sequence into a summary of tokens.
- Computing the similarity between tokens through a sequence edit-distance formula (extension function: semantic similarity description making use of the WordNet library).
- Computing the similarity between two token lists.
There was another conversation for your reference.
A far better similarity standing formula for varying duration strings
Cheers all for your assist and tips.
Martin Xie [MSFT] MSDN society Support | opinions to all of us Have or demand rule trial from Microsoft Kindly make sure you draw the responds as solutions should they help and unmark them if they provide no assist.
- Marked as address by Martin_Xie Monday, Sep 26, 2011 8:48 have always been
I’ve authored a code for my project to recognize similar labels more or less from database.
1st I made use of the DIFFERENCE(string1, string2)>=4 function of SQL servers however it failed to help me to because eg whenever first-name was actually “21” and 2nd name ended up being “21 jump street” the result contained two brands whereas certainly they failed to also comparable. and so the consequences group of these a query contained over 700 principles which was inadequate in cases like this.
then I discover a comparable CHANGE features for c# which was almost just like SQL form of that purpose. including they coordinated the similarity of “asdcdfsdfgdsgdg” and “asdewwetqwetrwe” as Great that is obviously untrue.
I quickly created a course with this problems to obtain additional efficient similarity between strings.
title for this lessons is actually StringCompare and we have found an introduction to this class:
WHAT’S STRING EVALUATE?
StringCompare is actually a contrasting means for strings. Perhaps not an ordinal review, but a relative evaluation that identifies just how much two strings is close or simply how much perhaps not similar.
By establishing the great tradeoff principles you can acquire an effective review for chain.
UTILIZING:
First you need to installed an instance of StringCompare with tradeoff beliefs or default tradeoff beliefs.
You can find 4 prices that may be set:
1. MinSimilarityLong:
This is actually the minimal appropriate amount of similarity between two chain that researching with StringCompare. This appreciate is used for chain with the period of no less than 8.
2. MinSimilaritybrief:
This is actually the minimum appropriate amount of similarity between two strings that evaluating with StringCompare. This price is employed for strings using size below 8.
3. MaxToleranceLong:
This is actually the max acceptable portion of endurance between two chain that researching with StringCompare. This value can be used for strings with all the duration of at least 8.
4. MaxToleranceShort:
Here is the maximum acceptable percentage of tolerance between two chain that comparing with StringCompare. This benefits can be used for chain utilizing the length below 8.
* after you have produced an instance you are able to contact InstanceName.IsEqual (string1, string2) to look for the equality of two chain.
* give consideration to the equality is actually relative to the minSimilarty and maxTolerance you ready earlier.
* see that larger minSimilarity values will result in a lot more constrained outcomes and vice versa.
* start thinking about that lower maxTolerance principles will result in a lot more restricted effects and the other way around.
Eg: