# Batch (machine learning) > The set of examples used in one training iteration. The batch size determines the number of examples in a batch.[^1] The set of [examples](https://wiki.g15e.com/pages/Example%20(machine%20learning.txt)) used in one training [iteration](https://wiki.g15e.com/pages/Iteration%20(machine%20learning.txt)). The [batch size](https://wiki.g15e.com/pages/Batch%20size%20(machine%20learning.txt)) determines the number of examples in a batch.[^1] See [epoch](https://wiki.g15e.com/pages/Epoch%20(machine%20learning.txt)) for an explanation of how a batch relates to an epoch. ## Footnotes [^1]: https://developers.google.com/machine-learning/glossary#batch