# When does training/validation data change?

**URL:** <https://forum.numer.ai/t/when-does-training-validation-data-change/2351>\
**Category:** Tournament\
**Created:** [March 13, 2021, 11:53pm UTC](https://forum.numer.ai/t/when-does-training-validation-data-change/2351 "2021-03-13T23:53:56Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![quantized](https://yyz1.discourse-cdn.com/flex009/user_avatar/forum.numer.ai/quantized/32/2255_2.png) [@quantized](https://forum.numer.ai/u/quantized)\
**Post date:** [March 13, 2021, 11:53pm UTC](https://forum.numer.ai/t/when-does-training-validation-data-change/2351/1 "2021-03-13T23:53:56Z")

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When, if ever, does training and validation data change? I had assumed it changes week on week, but after setting up my model workflow for the first time this round, and seeing that my diagnostics are identical to last round, I came on to the forum and found posts mentioning that it doesn’t change.

Presumably, if it does change, we are alerted, in order that we can re-train?

Thanks.

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<div class="post-metadata">

**Author:** ![wigglemuse](https://yyz1.discourse-cdn.com/flex009/user_avatar/forum.numer.ai/wigglemuse/32/3094_2.png) [@wigglemuse](https://forum.numer.ai/u/wigglemuse)\
**Post date:** [March 13, 2021, 11:56pm UTC](https://forum.numer.ai/t/when-does-training-validation-data-change/2351/2 "2021-03-13T23:56:43Z")

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It doesn’t change very often. Validation data is _updated_ once in a while, training data stays the same. Right now they are working on a 10x feature explosion – that will be the next big change presumably (which will be backward compatible), and yes they’ll be plenty of announcements and discussions about that.