keras LSTM中的有序输出

Question

Maybe it is a dummy question but I'd like to know whether I can have my output vector to meet specific requirements.

I have multiple outputs (that are not binary) and I want their sum to be 1. I want my model to do some kind of evaluation in order for my output vector to meet this requirement.

Answer 1

You can either:

• Add a softmax activation at the end of your model, or
• Create a custom normalizing function

Softmax:

Just add Activation('softmax') at the end of the model.
This will perform some log operations though, and may be adding some extra conditions you do not want.

Custom normalizing:

Simply add this layer:

import keras.backend as K

Lambda(lambda x: x / K.sum(x), output_shape=optional_with_tensorflow)