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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-39057] Add distance expressions for image feature comparison </title>
                <link>https://jira.mongodb.org/browse/SERVER-39057</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This ticket tracks the work contained in &lt;a href=&quot;https://github.com/mongodb/mongo/pull/1291&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Pull Request #1291&lt;/a&gt;.&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;We added these expressions: &lt;/p&gt;

&lt;p&gt;&apos;$cossim&apos;, &apos;$chi2&apos;, &apos;$euclidean&apos;, &apos;$squared_euclidean&apos;, &apos;$manhattan&apos;&lt;/p&gt;

&lt;p&gt;Which allow us to compare long vectors (image features) stored as arrays or BSON.&lt;br/&gt;
It is useful to find the most similar images in a dataset. The usage is the following:&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;In addition implementations using avx2 and avx512 are included in this pull request.&lt;/p&gt;&lt;/blockquote&gt;</description>
                <environment></environment>
        <key id="673680">SERVER-39057</key>
            <summary>Add distance expressions for image feature comparison </summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="kelsey.schubert@mongodb.com">Kelsey Schubert</reporter>
                        <labels>
                            <label>pull-request</label>
                    </labels>
                <created>Wed, 16 Jan 2019 23:44:09 +0000</created>
                <updated>Tue, 6 Dec 2022 03:07:56 +0000</updated>
                                                                                                <votes>1</votes>
                                    <watches>18</watches>
                                                                                                                <comments>
                            <comment id="2427120" author="asya" created="Fri, 20 Sep 2019 21:09:16 +0000"  >&lt;p&gt;Marc,&lt;/p&gt;

&lt;p&gt;I&apos;m sorry about the long delay to let you know that unfortunately, we will not be able to accept this pull request.&lt;/p&gt;


&lt;p&gt; I&apos;d like to outline a few reasons why this can&apos;t be merged:&lt;/p&gt;

&lt;p&gt;The PR proposes several generic operations for computing the Euclidean, squared Euclidean, cosine similarity, Chi-squared and Manhattan distances between two N-dimensional vectors. Adding these particular vector operations would invariably produce subsequent requests to backfill more basic operations (vector addition, scalar times vector, dot product, etc.) Just considering distance measures, why those four in particular? SciPy provides a couple dozen, and OpenCV provides 4, albeit a different 4.&lt;/p&gt;

&lt;p&gt;These types of functions might be a great addition to enhancing our analytics capabilities, but we feel it should only be done as part of a broader effort to add more computational operations. This should be probably spec&apos;ed out as part of full slate of related functions, e.g. numeric vector and matrix operations.&lt;/p&gt;

&lt;p&gt;Another related concern is about implementation for the new expressions &#8211; it is somewhat non-standard relative to existing expressions; for instance, the vectors themselves are passed in as raw float* with a separate parameter to indicate their length. In fact, it is likely that we would want to add something even for simple vectors that considers best storage format, possibly a new type of arrays that contain a single type, which is tracked in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9380&quot; title=&quot;Add single-type arrays&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9380&quot;&gt;SERVER-9380&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Again, I apologize that it took me so long to get back to you on this, and thank you for your interest in contributing to MongoDB!&lt;/p&gt;

&lt;p&gt;Asya Kamsky&lt;/p&gt;</comment>
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