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Implement Spatial Transformer used by LDM UNet #438

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Implement Spatial Transformer used by LDM UNet #438

wants to merge 1 commit into from

Commits on Jul 27, 2023

  1. Implement Spatial Transformer used by LDM UNet (facebookresearch#438) 

    Summary:
Pull Request resolved: facebookresearch#438

**TL;DR**
Implements the Spatial Transformer and the Cross-Attention layers used within the LDM Unet.

**Summary of Changes**
1. Implement `TransformerCrossAttentionLayer` similar to LDM;s implementation. This module uses `GEGLU` activation instead of `GLU`
1. Implements `SpatialTransformer` that operates on images.
1. Implement `GEGLU` activation
1. Implement `zero_module` util
1. Add tests for each component

Reviewed By: pbontrager

Differential Revision: D47709486

fbshipit-source-id: 16da8eaeac65c64b40b5afe266a12540d95a7bcc
    @facebook-github-bot
    Abhinav Arora authored and facebook-github-bot committed Jul 27, 2023
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