# UIServer in multi use mode
**URL:** https://community.konduit.ai/t/uiserver-in-multi-use-mode/796
**Category:** DL4J
**Created:** [August 18, 2020, 10:51am UTC](https://community.konduit.ai/t/uiserver-in-multi-use-mode/796 "2020-08-18T10:51:26Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Cpt\_Whittmann](https://community.konduit.ai/u/Cpt_Whittmann)
#### Post date: [August 18, 2020, 10:51am UTC](https://community.konduit.ai/t/uiserver-in-multi-use-mode/796/1 "2020-08-18T10:51:26Z")
Hi, I am trying to get the UIServer in multi use mode working. I can create it, create multiple InMemoryStatsStorage objects and pass them via the function argument. The problem seems to be that I cannot store the sessionIds within each InMemoryStatsStorage object? The server comes up with “unknown sessionID”. How do you store the sessionId within each InMemoryStatsStorage object?
Many thanks.
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### Author:  [@cagneymoreau](https://community.konduit.ai/u/cagneymoreau)
#### Post date: [August 19, 2020, 3:28pm UTC](https://community.konduit.ai/t/uiserver-in-multi-use-mode/796/2 "2020-08-19T15:28:11Z")
Have you tried running an example project with a UIServer ? Does it work?
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### Author:  [@Cpt\_Whittmann](https://community.konduit.ai/u/Cpt_Whittmann)
#### Post date: [August 19, 2020, 4:08pm UTC](https://community.konduit.ai/t/uiserver-in-multi-use-mode/796/3 "2020-08-19T16:08:19Z")
Yes, I can get the UIServer to work no problem in single use mode.
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### Author:  [@printomi](https://community.konduit.ai/u/printomi)
#### Post date: [August 24, 2020, 1:48pm UTC](https://community.konduit.ai/t/uiserver-in-multi-use-mode/796/4 "2020-08-24T13:48:34Z")
Hi @Cpt_Whittmann,
Currently, we don’t have [example code](https://github.com/eclipse/deeplearning4j-examples/tree/master/dl4j-examples/src/main/java/org/deeplearning4j/examples/quickstart/features/userinterface) for multi-session mode `UIServer`, so you would have to figure out the usage from the unit test cases. This feature is my contribution to the project, so I will give you this tutorial on how to use DL4J UIServer in multi-session mode.
In single-session mode, you can use one `StatsStorage` to store multiple training sessions. You may want to set a meaningful session ID for each training so that you can use the session selector drop-down that lists training sessions in the `StatsStorage`.
However, if you want to display only one session at a time, you can use multi-session mode.
In multi-session mode, multiple independent training and/or optimization sessions can be displayed, based on the session ID.
Note: This working mode does not provide user separation, e.g. the loaded sessions can be viewed from different browser sessions, but changing display language in one browser will affect the setting in all browsers visiting that session.
With the following steps, you can set up a multi-session `UIServer`:
1. Set session ID of listener: By default, session ID is a random string (UUID), but you can to set your own ID on the listener (`StatsListener` or `ArbiterStatusListener`), before training/optimization.
2. Start training/optimization: The listener will then store the following events (training/optimization) with that session ID.
3. Start `UIServer` with a function that maps `StatStorage` to session ID (`Function statsStorageProvider`).
4. Visit the session URL to auto-attach the stats storage of the session ID.
- training session: `http://localhost:9000/train/sessionID`
- optimization session: `http://localhost:9000/arbiter/sessionID`
During auto-attach, `UIServer` checks if the provided `StatsStorage` (which can contain multiple sessions) actually contain the given session ID. However, the session ID will be written to the storage _only after the first stats storage event_, so you have to start training/optimization before trying to attach the stats storage.
You will see a list of attached session ID-s
- training sessions: `http://localhost:9000/train/`
- optimization sessions: `http://localhost:9000/arbiter/`
See this training test case with `StatsListener`:
[https://github.com/eclipse/deeplearning4j/blob/master/deeplearning4j/deeplearning4j-ui-parent/deeplearning4j-vertx/src/test/java/org/deeplearning4j/ui/TestVertxUIMultiSession.java#L158](https://github.com/eclipse/deeplearning4j/blob/master/deeplearning4j/deeplearning4j-ui-parent/deeplearning4j-vertx/src/test/java/org/deeplearning4j/ui/TestVertxUIMultiSession.java#L158)
For optimization, session ID can be set in `ArbiterStatusListener` constructor and it cannot be changed later. See this optimization test case:
>
Feel free to ask if something is not clear.
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### Author:  [@Cpt\_Whittmann](https://community.konduit.ai/u/Cpt_Whittmann)
#### Post date: [August 27, 2020, 1:00pm UTC](https://community.konduit.ai/t/uiserver-in-multi-use-mode/796/5 "2020-08-27T13:00:33Z")
Many thanks for this. I was looking as to how the sessionId was stored with relation to the StatsStorage Object and this is done with a StatsListener object. I will test this out.