How to multiply Keras tensor by scalar?

Question

if I have tensors, v, w, I know you can multiply them together with

a = Multiply()([v, w])

But what if I want to multiply v or w by a scalar?

Answer 1

You can use a Lambda layer for any other scalar manipulations

Scalar Multiplication:

res5 = Lambda(lambda x: x * 3)(res4)

Scalar Addition:

res5 = Lambda(lambda x: x + 4)(res4)

Answer 2

If you are using tensorflow as your backend, the * operator is supported (see this answer).

a = v * 0.10