added SeparableConv2d delete channel

[bpoppinga]

No description provided.

[Raukk]

Hey @bpoppinga,

I have just created a Fork of this project targeting Tensorflow.Keras.

I would be like to merge in this pull request to that Fork:
https://github.com/Raukk/tf-keras-surgeon

I could manually add it, but I would like to ensure you get attributed/credit.

Thanks

[FlatErik90]

Is there a chance this PR will be submitted anytime soon? I'm using this as a hotfix for some time now but it would be great to have it in the official repo. Using Raukk`s fork doesn't work for me due to TF version incompatibility.

[BenWhetton]

Sorry I didn't respond for so long. I haven't been actively maintaining this project for a while.
I'll try to review this in the next week.

[BenWhetton]

@bpoppinga Thanks for the contribution. The code looks generally up to the same standard as the rest of the codebase.
Would you have time to write one or two simple test cases for this code?

• A test case which checks that the correct weights are removed from the layer itself
• A test case for the code in _apply_delete_mask which propagates upstream pruning changes

I've only just make myself familiar with Separable2D layers so it'd probably take me a while to work out exactly what the pruning logic is supposed to do so in order to write the tests. If you could at least supply some inputs and expected outputs that would be very helpful.