question Re: Speed layer in Oryx2 in Archives of Support Questions (Read Only)

Speed layer in Oryx2

Jayani — Mon, 11 May 2015 10:01:20 GMT

Hi,

Is the speed layer following an incremental learning approach in Oryx2? (during Model Update).

Thanks

Jayani

Re: Speed layer in Oryx2

srowen — Mon, 11 May 2015 11:07:29 GMT

The speed layer does indeed produce incremental updates. Like the serving layer, it loads the most recent model in memory and then computes how the model might change (approximately, rapidly) in response to new data, and internalizes and publishes those updates. The serving layers then hear the models but also the updates on the queue and update accordingly.

Re: Speed layer in Oryx2

Jayani — Mon, 11 May 2015 13:35:41 GMT

Thanks Sean for the prompt response 🙂

So, can we use or customize the same speed layer approach for mini-batch learning as well?

Also, does Oryx have any future plans to support built-in pre-processing methods for text analysis such as Tokenization and TF-IDF vector creation?

Thank you

Jayani

Re: Speed layer in Oryx2

srowen — Mon, 11 May 2015 14:00:57 GMT

Yes, well, I'd say that the batch layer can do "mini batch" if you simply use a low interval time. It's not a special case, really. I think this project isn't going to add its own data prep pipeline, no, but the idea is that you can use any Java or Spark-based libraries you like as part of your app. There's no need to have a different special set of support in this project.

Re: Speed layer in Oryx2

Jayani — Mon, 11 May 2015 14:15:20 GMT

Okay. Thanks Sean for the information.

Re: Speed layer in Oryx2

Jason.Chen — Fri, 22 May 2015 05:48:24 GMT

Sean,

Can you provide more detailed information about how the approximation is computed in Oryx 2.0 ?

Is it the same fold-in approach as Oryx 1.0 ? Can you point to the code base as reference ?

Thanks.

Jason

Re: Speed layer in Oryx2

srowen — Fri, 22 May 2015 07:23:17 GMT

ALS: yes, fold-in just as before k-means: assign point to a cluster and update its centroid (but don't reassign any other points) RDF: assign point to leaf and update leaf's prediction (but don't change the rest of the tree)