count min sketch
I don't understand the use case of count min sketch.
Based on https://en.wikipedia.org/wiki/Count%E2%80%93min_sketch .
It says " serves as a frequency table of events in a stream of data. ".
If I know there are N types of events, why can't I just allocate an array of N slots or a hashmap to keep track of the event frequencies as the stream is ingested?
Am I right to say the use case is when N is unknown or N is so large that it is not possible to keep the entire frequency array/hashmap in memory?
algorithms counting
asked 4 hours ago
Mave
1061
New contributor
Mave is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I don't understand the use case of count min sketch.
Based on https://en.wikipedia.org/wiki/Count%E2%80%93min_sketch .
It says " serves as a frequency table of events in a stream of data. ".
If I know there are N types of events, why can't I just allocate an array of N slots or a hashmap to keep track of the event frequencies as the stream is ingested?
Am I right to say the use case is when N is unknown or N is so large that it is not possible to keep the entire frequency array/hashmap in memory?
algorithms counting
asked 4 hours ago
Mave
1061
New contributor
Mave is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I don't understand the use case of count min sketch.
Based on https://en.wikipedia.org/wiki/Count%E2%80%93min_sketch .
It says " serves as a frequency table of events in a stream of data. ".
If I know there are N types of events, why can't I just allocate an array of N slots or a hashmap to keep track of the event frequencies as the stream is ingested?
Am I right to say the use case is when N is unknown or N is so large that it is not possible to keep the entire frequency array/hashmap in memory?
algorithms counting
asked 4 hours ago
Mave
1061
New contributor
Mave is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I don't understand the use case of count min sketch.
Based on https://en.wikipedia.org/wiki/Count%E2%80%93min_sketch .
It says " serves as a frequency table of events in a stream of data. ".
If I know there are N types of events, why can't I just allocate an array of N slots or a hashmap to keep track of the event frequencies as the stream is ingested?
Am I right to say the use case is when N is unknown or N is so large that it is not possible to keep the entire frequency array/hashmap in memory?
algorithms counting
algorithms counting
asked 4 hours ago
Mave
1061
New contributor
Mave is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
Mave
1061
New contributor
Mave is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
Mave
1061
New contributor
Mave is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
Mave
1061
asked 4 hours ago
Mave
1061
1061
New contributor
Mave is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Mave is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Mave is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
Yes, the use case is $N$ so large that the entire table would not fit in the main memory. For example, imagine that every event is tied to an IPv6 address. IPv6 uses 128 bits for each address, so you would in principle need an array with $2^{128}$ elements.
answered 2 hours ago
Vincenzo
1,3981311
add a comment |
Sketches are data structures used in streaming algorithms. The idea is that while the stream is very long, the hardware processing it has limited memory. We want to be able to retain statistical information about the data without storing it completely.
You can find more information about sketching here.
answered 2 hours ago
Yuval Filmus
189k12177340
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
return StackExchange.using("mathjaxEditing", function () {
StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix) {
StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
});
});
}, "mathjax-editing");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "419"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Mave is a new contributor. Be nice, and check out our Code of Conduct.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fcs.stackexchange.com%2fquestions%2f102147%2fcount-min-sketch%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Yes, the use case is $N$ so large that the entire table would not fit in the main memory. For example, imagine that every event is tied to an IPv6 address. IPv6 uses 128 bits for each address, so you would in principle need an array with $2^{128}$ elements.
answered 2 hours ago
Vincenzo
1,3981311
add a comment |
Yes, the use case is $N$ so large that the entire table would not fit in the main memory. For example, imagine that every event is tied to an IPv6 address. IPv6 uses 128 bits for each address, so you would in principle need an array with $2^{128}$ elements.
answered 2 hours ago
Vincenzo
1,3981311
add a comment |
Yes, the use case is $N$ so large that the entire table would not fit in the main memory. For example, imagine that every event is tied to an IPv6 address. IPv6 uses 128 bits for each address, so you would in principle need an array with $2^{128}$ elements.
answered 2 hours ago
Vincenzo
1,3981311
Yes, the use case is $N$ so large that the entire table would not fit in the main memory. For example, imagine that every event is tied to an IPv6 address. IPv6 uses 128 bits for each address, so you would in principle need an array with $2^{128}$ elements.
answered 2 hours ago
Vincenzo
1,3981311
answered 2 hours ago
Vincenzo
1,3981311
answered 2 hours ago
Vincenzo
1,3981311
answered 2 hours ago
Vincenzo
1,3981311
1,3981311
add a comment |
add a comment |
Sketches are data structures used in streaming algorithms. The idea is that while the stream is very long, the hardware processing it has limited memory. We want to be able to retain statistical information about the data without storing it completely.
You can find more information about sketching here.
answered 2 hours ago
Yuval Filmus
189k12177340
add a comment |
Sketches are data structures used in streaming algorithms. The idea is that while the stream is very long, the hardware processing it has limited memory. We want to be able to retain statistical information about the data without storing it completely.
You can find more information about sketching here.
answered 2 hours ago
Yuval Filmus
189k12177340
add a comment |
Sketches are data structures used in streaming algorithms. The idea is that while the stream is very long, the hardware processing it has limited memory. We want to be able to retain statistical information about the data without storing it completely.
You can find more information about sketching here.
answered 2 hours ago
Yuval Filmus
189k12177340
Sketches are data structures used in streaming algorithms. The idea is that while the stream is very long, the hardware processing it has limited memory. We want to be able to retain statistical information about the data without storing it completely.
You can find more information about sketching here.
answered 2 hours ago
Yuval Filmus
189k12177340
answered 2 hours ago
Yuval Filmus
189k12177340
answered 2 hours ago
Yuval Filmus
189k12177340
answered 2 hours ago
Yuval Filmus
189k12177340
189k12177340
add a comment |
add a comment |
Mave is a new contributor. Be nice, and check out our Code of Conduct.
Mave is a new contributor. Be nice, and check out our Code of Conduct.
Mave is a new contributor. Be nice, and check out our Code of Conduct.
Mave is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Computer Science Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
Use MathJax to format equations. MathJax reference.
To learn more, see our tips on writing great answers.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fcs.stackexchange.com%2fquestions%2f102147%2fcount-min-sketch%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
