> For the complete documentation index, see [llms.txt](https://deeplearning4j.konduit.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://deeplearning4j.konduit.ai/1.0.0-m2/deeplearning4j/how-to-guides/keras-import/supported-features/constraints.md).

# Constraints

All [Keras constraints](https://keras.io/constraints) are supported:

* max\_norm
* non\_neg
* unit\_norm
* min\_max\_norm

Mapping Keras to DL4J constraints happens in [KerasConstraintUtils](https://github.com/eclipse/deeplearning4j/blob/master/deeplearning4j/deeplearning4j-modelimport/src/main/java/org/deeplearning4j/nn/modelimport/keras/utils/KerasConstraintUtils.java).