Choosing random element

[Maximilian Alber]

Hi Flinksters,

again a similar problem. I would like to choose ONE random element out of a data set, without shuffling the whole set. Again I would like to have the element (mathematically) randomly chosen.

Thanks!

Cheers,

Max

[Till Rohrmann]

This might help you [1].

Cheers,

Till

[1] http://stackoverflow.com/questions/2514061/how-to-pick-random-small-data-samples-using-map-reduce

On Tue, Jun 16, 2015 at 10:16 AM Maximilian Alber <[hidden email]> wrote:

Hi Flinksters,

again a similar problem. I would like to choose ONE random element out of a data set, without shuffling the whole set. Again I would like to have the element (mathematically) randomly chosen.

Thanks!

Cheers,

Max

[Maximilian Alber]

Thanks!

Cheers,

Max

On Tue, Jun 16, 2015 at 11:01 AM, Till Rohrmann <[hidden email]> wrote:

This might help you [1].

Cheers,

Till

[1] http://stackoverflow.com/questions/2514061/how-to-pick-random-small-data-samples-using-map-reduce

On Tue, Jun 16, 2015 at 10:16 AM Maximilian Alber <[hidden email]> wrote:

Hi Flinksters,

again a similar problem. I would like to choose ONE random element out of a data set, without shuffling the whole set. Again I would like to have the element (mathematically) randomly chosen.

Thanks!

Cheers,

Max

[Sachin Goel]

Hi

If you're looking for an implementation, I wrote this in context of a Random k-means initialization. Take a look at the {{weightedFit}} function.
https://github.com/sachingoel0101/flink/blob/clustering_initializations/flink-staging/flink-ml/src/main/scala/org/apache/flink/ml/clustering/KMeansRandomInit.scala

Note that numCluster is the number of points you need in the sample.

On Tue, Jun 16, 2015 at 2:45 PM, Maximilian Alber <[hidden email]> wrote:

Thanks!

Cheers,

Max

On Tue, Jun 16, 2015 at 11:01 AM, Till Rohrmann <[hidden email]> wrote:

This might help you [1].

Cheers,

Till

[1] http://stackoverflow.com/questions/2514061/how-to-pick-random-small-data-samples-using-map-reduce

On Tue, Jun 16, 2015 at 10:16 AM Maximilian Alber <[hidden email]> wrote:

Hi Flinksters,

again a similar problem. I would like to choose ONE random element out of a data set, without shuffling the whole set. Again I would like to have the element (mathematically) randomly chosen.

Thanks!

Cheers,

Max