Lesson 8 in-class

Part 2 (2017)
101

Is ACO (Ant Colony Optimization) an deterministic optimization that can be used?

102

This is still a non-convex problem right? Or can it be posed as a convex optimization (and then can use interior point methods?)

1 Like
103

We have keras+tf extracting the VGG features. These are used by scipy for bfgs. Does the bfgs also run on the GPU?

104

Where do the semi-regular geometric patterns in the generated image come from?

105

Follow up to previous? How would batching work for this vgg + scipy scenario?

106

Has anyone tried something like this by averaging (or in some way combining) the activations of multiple bird images, such that it creates some kind of novel or ā€œprototypicalā€ bird?

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107

where to get the file ā€œfnames.pklā€

108

Just to make sure I understand this ā€“ in this example we started with a random image. But if we started with the ACTUAL image as the initial condition, we would get the original image back, right? Cause that would perfectly optimize with zero loss right? Iā€™m sure youā€™ll get to it ā€“ but Iā€™m interested to find out where we initialize for the artistic styling problemā€¦

109

Would it be useful to use a tool like Quiver to figure out which Vgg layer to use for this?

3 Likes
110

Gut-feeling: It looks to me like JPEG compression artifacts. Apparently, VGG is pulling these out since it looks for edges and other features.

111

Has anyone since the publication of this paper used any other loss functions for f(style) that seem to achieve visually similar results?

112

If you import the VGG model that is built into keras, do you still have to re-order the channels, etc.?

113

How do we use the output of the different layers (more than one from VGG) for style loss?

114

I believe so. keras.applications.imagenet_utils has vgg_preprocess that does this.

115

are there any kind of homework or other recommendation of deepen the knowledge of the first lecture?

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116

Is there any slack channel for part-2?

117

No there isnā€™t a slack channel for part 2. Jeremy said the discussions would be on the forums this time.

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118

Will there be a way to watch again, I missed about 15 minutes and is giving me an unknown error and says canā€™t watch on a different site, click to watch on youtube (Iā€™m on youtube) when clicking it gives another error has occured.

119

You can watch livestream again on Jeremyā€™s channel:

https://www.youtube.com/channel/UCxdAk_H3vzci9ojgtFKjO2g

120

Yes, you do