How to force a predicted Flux model to give output numbers > 0

Hi everybody,
I have some inputs and outputs data for training a model using Flux package. These data by nature should be strictly positive.The training phase was done successfully however when I am trying to check it validity by using some test data, some of them were OK but others give negative values. How can I force the model to only outputted positive values.
Thanks and greeting.

Use as activation function of the last layer a function whose domain is in R+, most notably the Relu function.

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Thank you a lot for your prompt reply.