use nn.Sequential to remove python control flow from autoencoder up/downsampling

[technillogue]

the current autoencoder implementation causes graph breaks, likely due to python control flow. the hs list constructed in the encoder is also egregious. performance improvement numbers TBD this does not make an improvement with normal eager torch, if we decide to compile for the autoencoder it will fix the graph breaks with tensorrt, but torch.compile may see through this structure.

[yorickvP]

• DId you check that it has the same result?
• Interestingly, I did torch._dynamo.explain on the (FP8) decoder and it said no graph breaks.
• Would be nice to also have this for FP8

[daanelson]

@yorickvP interesting that there's no graph breaks; wonder if the compiler is smart enough to realize that the if statements will always evaluate to true/false depending on loop iteration.

agreed that we should get perf numbers & test that outputs are unchanged

[technillogue]

unfortunately this changes the state_dict keys:

Got 180 missing keys:
encoder.down.0.norm1.weight
encoder.down.0.norm1.bias
encoder.down.0.conv1.weight
encoder.down.0.conv1.bias

encoder.down.0.norm2.weight encoder.down.0.norm2.bias encoder.down.0.conv2.weight encoder.down.0.conv2.bias encoder.down.1.norm1.weight encoder.down.1.norm1.bias encoder.down.1.conv1.weight encoder.down.1.conv1.bias encoder.down.1.norm2.weight encoder.down.1.norm2.bias encoder.down.1.conv2.weight encoder.down.1.conv2.bias encoder.down.2.conv.weight encoder.down.2.conv.bias encoder.down.3.norm1.weight encoder.down.3.norm1.bias encoder.down.3.conv1.weight encoder.down.3.conv1.bias encoder.down.3.norm2.weight encoder.down.3.norm2.bias encoder.down.3.conv2.weight encoder.down.3.conv2.bias encoder.down.3.nin_shortcut.weight encoder.down.3.nin_shortcut.bias encoder.down.4.norm1.weight encoder.down.4.norm1.bias encoder.down.4.conv1.weight encoder.down.4.conv1.bias encoder.down.4.norm2.weight encoder.down.4.norm2.bias encoder.down.4.conv2.weight encoder.down.4.conv2.bias encoder.down.5.conv.weight encoder.down.5.conv.bias encoder.down.6.norm1.weight encoder.down.6.norm1.bias encoder.down.6.conv1.weight encoder.down.6.conv1.bias encoder.down.6.norm2.weight encoder.down.6.norm2.bias encoder.down.6.conv2.weight encoder.down.6.conv2.bias encoder.down.6.nin_shortcut.weight encoder.down.6.nin_shortcut.bias encoder.down.7.norm1.weight encoder.down.7.norm1.bias encoder.down.7.conv1.weight encoder.down.7.conv1.bias encoder.down.7.norm2.weight encoder.down.7.norm2.bias encoder.down.7.conv2.weight encoder.down.7.conv2.bias encoder.down.8.conv.weight encoder.down.8.conv.bias encoder.down.9.norm1.weight encoder.down.9.norm1.bias encoder.down.9.conv1.weight encoder.down.9.conv1.bias encoder.down.9.norm2.weight encoder.down.9.norm2.bias encoder.down.9.conv2.weight encoder.down.9.conv2.bias encoder.down.10.norm1.weight encoder.down.10.norm1.bias encoder.down.10.conv1.weight encoder.down.10.conv1.bias encoder.down.10.norm2.weight encoder.down.10.norm2.bias encoder.down.10.conv2.weight encoder.down.10.conv2.bias decoder.up.0.norm1.weight decoder.up.0.norm1.bias decoder.up.0.conv1.weight decoder.up.0.conv1.bias decoder.up.0.norm2.weight decoder.up.0.norm2.bias decoder.up.0.conv2.weight decoder.up.0.conv2.bias decoder.up.0.nin_shortcut.weight decoder.up.0.nin_shortcut.bias decoder.up.1.norm1.weight decoder.up.1.norm1.bias decoder.up.1.conv1.weight decoder.up.1.conv1.bias decoder.up.1.norm2.weight decoder.up.1.norm2.bias decoder.up.1.conv2.weight decoder.up.1.conv2.bias decoder.up.2.norm1.weight decoder.up.2.norm1.bias decoder.up.2.conv1.weight decoder.up.2.conv1.bias decoder.up.2.norm2.weight decoder.up.2.norm2.bias decoder.up.2.conv2.weight decoder.up.2.conv2.bias decoder.up.3.norm1.weight decoder.up.3.norm1.bias decoder.up.3.conv1.weight decoder.up.3.conv1.bias decoder.up.3.norm2.weight decoder.up.3.norm2.bias decoder.up.3.conv2.weight decoder.up.3.conv2.bias decoder.up.3.nin_shortcut.weight decoder.up.3.nin_shortcut.bias decoder.up.4.norm1.weight decoder.up.4.norm1.bias decoder.up.4.conv1.weight decoder.up.4.conv1.bias decoder.up.4.norm2.weight decoder.up.4.norm2.bias decoder.up.4.conv2.weight decoder.up.4.conv2.bias decoder.up.5.norm1.weight decoder.up.5.norm1.bias decoder.up.5.conv1.weight decoder.up.5.conv1.bias decoder.up.5.norm2.weight decoder.up.5.norm2.bias decoder.up.5.conv2.weight decoder.up.5.conv2.bias decoder.up.6.conv.weight decoder.up.6.conv.bias decoder.up.7.norm1.weight decoder.up.7.norm1.bias decoder.up.7.conv1.weight decoder.up.7.conv1.bias decoder.up.7.norm2.weight decoder.up.7.norm2.bias decoder.up.7.conv2.weight decoder.up.7.conv2.bias decoder.up.8.norm1.weight decoder.up.8.norm1.bias decoder.up.8.conv1.weight decoder.up.8.conv1.bias decoder.up.8.norm2.weight decoder.up.8.norm2.bias decoder.up.8.conv2.weight decoder.up.8.conv2.bias decoder.up.9.norm1.weight decoder.up.9.norm1.bias decoder.up.9.conv1.weight decoder.up.9.conv1.bias decoder.up.9.norm2.weight decoder.up.9.norm2.bias decoder.up.9.conv2.weight decoder.up.9.conv2.bias decoder.up.10.conv.weight decoder.up.10.conv.bias decoder.up.11.norm1.weight decoder.up.11.norm1.bias decoder.up.11.conv1.weight decoder.up.11.conv1.bias decoder.up.11.norm2.weight decoder.up.11.norm2.bias decoder.up.11.conv2.weight decoder.up.11.conv2.bias decoder.up.12.norm1.weight decoder.up.12.norm1.bias decoder.up.12.conv1.weight decoder.up.12.conv1.bias decoder.up.12.norm2.weight decoder.up.12.norm2.bias decoder.up.12.conv2.weight decoder.up.12.conv2.bias decoder.up.13.norm1.weight decoder.up.13.norm1.bias decoder.up.13.conv1.weight decoder.up.13.conv1.bias decoder.up.13.norm2.weight decoder.up.13.norm2.bias decoder.up.13.conv2.weight decoder.up.13.conv2.bias decoder.up.14.conv.weight decoder.up.14.conv.bias

---

Got 180 unexpected keys:
encoder.down.0.block.0.conv1.bias
encoder.down.0.block.0.conv1.weight
encoder.down.0.block.0.conv2.bias
encoder.down.0.block.0.conv2.weight

encoder.down.0.block.0.norm1.bias encoder.down.0.block.0.norm1.weight encoder.down.0.block.0.norm2.bias encoder.down.0.block.0.norm2.weight encoder.down.0.block.1.conv1.bias encoder.down.0.block.1.conv1.weight encoder.down.0.block.1.conv2.bias encoder.down.0.block.1.conv2.weight encoder.down.0.block.1.norm1.bias encoder.down.0.block.1.norm1.weight encoder.down.0.block.1.norm2.bias encoder.down.0.block.1.norm2.weight encoder.down.0.downsample.conv.bias encoder.down.0.downsample.conv.weight encoder.down.1.block.0.conv1.bias encoder.down.1.block.0.conv1.weight encoder.down.1.block.0.conv2.bias encoder.down.1.block.0.conv2.weight encoder.down.1.block.0.nin_shortcut.bias encoder.down.1.block.0.nin_shortcut.weight encoder.down.1.block.0.norm1.bias encoder.down.1.block.0.norm1.weight encoder.down.1.block.0.norm2.bias encoder.down.1.block.0.norm2.weight encoder.down.1.block.1.conv1.bias encoder.down.1.block.1.conv1.weight encoder.down.1.block.1.conv2.bias encoder.down.1.block.1.conv2.weight encoder.down.1.block.1.norm1.bias encoder.down.1.block.1.norm1.weight encoder.down.1.block.1.norm2.bias encoder.down.1.block.1.norm2.weight encoder.down.1.downsample.conv.bias encoder.down.1.downsample.conv.weight encoder.down.2.block.0.conv1.bias encoder.down.2.block.0.conv1.weight encoder.down.2.block.0.conv2.bias encoder.down.2.block.0.conv2.weight encoder.down.2.block.0.nin_shortcut.bias encoder.down.2.block.0.nin_shortcut.weight encoder.down.2.block.0.norm1.bias encoder.down.2.block.0.norm1.weight encoder.down.2.block.0.norm2.bias encoder.down.2.block.0.norm2.weight encoder.down.2.block.1.conv1.bias encoder.down.2.block.1.conv1.weight encoder.down.2.block.1.conv2.bias encoder.down.2.block.1.conv2.weight encoder.down.2.block.1.norm1.bias encoder.down.2.block.1.norm1.weight encoder.down.2.block.1.norm2.bias encoder.down.2.block.1.norm2.weight encoder.down.2.downsample.conv.bias encoder.down.2.downsample.conv.weight encoder.down.3.block.0.conv1.bias encoder.down.3.block.0.conv1.weight encoder.down.3.block.0.conv2.bias encoder.down.3.block.0.conv2.weight encoder.down.3.block.0.norm1.bias encoder.down.3.block.0.norm1.weight encoder.down.3.block.0.norm2.bias encoder.down.3.block.0.norm2.weight encoder.down.3.block.1.conv1.bias encoder.down.3.block.1.conv1.weight encoder.down.3.block.1.conv2.bias encoder.down.3.block.1.conv2.weight encoder.down.3.block.1.norm1.bias encoder.down.3.block.1.norm1.weight encoder.down.3.block.1.norm2.bias encoder.down.3.block.1.norm2.weight decoder.up.0.block.0.conv1.bias decoder.up.0.block.0.conv1.weight decoder.up.0.block.0.conv2.bias decoder.up.0.block.0.conv2.weight decoder.up.0.block.0.nin_shortcut.bias decoder.up.0.block.0.nin_shortcut.weight decoder.up.0.block.0.norm1.bias decoder.up.0.block.0.norm1.weight decoder.up.0.block.0.norm2.bias decoder.up.0.block.0.norm2.weight decoder.up.0.block.1.conv1.bias decoder.up.0.block.1.conv1.weight decoder.up.0.block.1.conv2.bias decoder.up.0.block.1.conv2.weight decoder.up.0.block.1.norm1.bias decoder.up.0.block.1.norm1.weight decoder.up.0.block.1.norm2.bias decoder.up.0.block.1.norm2.weight decoder.up.0.block.2.conv1.bias decoder.up.0.block.2.conv1.weight decoder.up.0.block.2.conv2.bias decoder.up.0.block.2.conv2.weight decoder.up.0.block.2.norm1.bias decoder.up.0.block.2.norm1.weight decoder.up.0.block.2.norm2.bias decoder.up.0.block.2.norm2.weight decoder.up.1.block.0.conv1.bias decoder.up.1.block.0.conv1.weight decoder.up.1.block.0.conv2.bias decoder.up.1.block.0.conv2.weight decoder.up.1.block.0.nin_shortcut.bias decoder.up.1.block.0.nin_shortcut.weight decoder.up.1.block.0.norm1.bias decoder.up.1.block.0.norm1.weight decoder.up.1.block.0.norm2.bias decoder.up.1.block.0.norm2.weight decoder.up.1.block.1.conv1.bias decoder.up.1.block.1.conv1.weight decoder.up.1.block.1.conv2.bias decoder.up.1.block.1.conv2.weight decoder.up.1.block.1.norm1.bias decoder.up.1.block.1.norm1.weight decoder.up.1.block.1.norm2.bias decoder.up.1.block.1.norm2.weight decoder.up.1.block.2.conv1.bias decoder.up.1.block.2.conv1.weight decoder.up.1.block.2.conv2.bias decoder.up.1.block.2.conv2.weight decoder.up.1.block.2.norm1.bias decoder.up.1.block.2.norm1.weight decoder.up.1.block.2.norm2.bias decoder.up.1.block.2.norm2.weight decoder.up.1.upsample.conv.bias decoder.up.1.upsample.conv.weight decoder.up.2.block.0.conv1.bias decoder.up.2.block.0.conv1.weight decoder.up.2.block.0.conv2.bias decoder.up.2.block.0.conv2.weight decoder.up.2.block.0.norm1.bias decoder.up.2.block.0.norm1.weight decoder.up.2.block.0.norm2.bias decoder.up.2.block.0.norm2.weight decoder.up.2.block.1.conv1.bias decoder.up.2.block.1.conv1.weight decoder.up.2.block.1.conv2.bias decoder.up.2.block.1.conv2.weight decoder.up.2.block.1.norm1.bias decoder.up.2.block.1.norm1.weight decoder.up.2.block.1.norm2.bias decoder.up.2.block.1.norm2.weight decoder.up.2.block.2.conv1.bias decoder.up.2.block.2.conv1.weight decoder.up.2.block.2.conv2.bias decoder.up.2.block.2.conv2.weight decoder.up.2.block.2.norm1.bias decoder.up.2.block.2.norm1.weight decoder.up.2.block.2.norm2.bias decoder.up.2.block.2.norm2.weight decoder.up.2.upsample.conv.bias decoder.up.2.upsample.conv.weight decoder.up.3.block.0.conv1.bias decoder.up.3.block.0.conv1.weight decoder.up.3.block.0.conv2.bias decoder.up.3.block.0.conv2.weight decoder.up.3.block.0.norm1.bias decoder.up.3.block.0.norm1.weight decoder.up.3.block.0.norm2.bias decoder.up.3.block.0.norm2.weight decoder.up.3.block.1.conv1.bias decoder.up.3.block.1.conv1.weight decoder.up.3.block.1.conv2.bias decoder.up.3.block.1.conv2.weight decoder.up.3.block.1.norm1.bias decoder.up.3.block.1.norm1.weight decoder.up.3.block.1.norm2.bias decoder.up.3.block.1.norm2.weight decoder.up.3.block.2.conv1.bias decoder.up.3.block.2.conv1.weight decoder.up.3.block.2.conv2.bias decoder.up.3.block.2.conv2.weight decoder.up.3.block.2.norm1.bias decoder.up.3.block.2.norm1.weight decoder.up.3.block.2.norm2.bias decoder.up.3.block.2.norm2.weight decoder.up.3.upsample.conv.bias decoder.up.3.upsample.conv.weight

The unexpected keys are the one in the ae.sft file, the expected keys are the ones from using flat Sequential[ResnetBlock] instead of ModuleList[ModuleList[ResnetBlock]]. there's probably a way to remap the state_dict keys but it would be easier if we could modify the file