Question to define the parameters with relationships

[leslie-fang-intel]

Hi @jansel, I have a question to define parameters for my tuning case. I have 3 parameters to tune:

• Parameter1: A EnumParameter with a list of candidates, for example [1, 2, 4, 7, 14, 28]
• Parameter2: 1. Pick from a range of min and max integer (user inputs). 2. Must be divisible by Parameter1.
• Parameter3: Pick from a range between min and max integer. The min integer is 1. The max integer should be Parameter2//Parameter1.

Could you kindly help to take a look how can I define these parameters in openTuner to tune?

[jansel]

There are a few options. One way would be to override Parameter.normalize() to map invalid configs to the "closest" valid config. Or implement a custom Parameter subclass to encode your constraints.

Another option, that might be easier, would be to rewrite your search space in a way where all points are valid. For your example, you could reframe your problem in terms of more primitive parameters:

p1 = a
p2 = a * b
p3 = floor(c*(p2//p1))

a would be the same enum. b would be an integer. c would be a float from 0 to 1.

This mapping encodes your constraints as a projection in configuration space.

[leslie-fang-intel]

Thanks for the reply, I will take a try.