configs/model/openai_unet.yaml

openai_unet_sd:
  type: openai_unet
  args:
    image_size: null # no use
    in_channels: 4
    out_channels: 4
    model_channels: 320
    attention_resolutions: [ 4, 2, 1 ]
    num_res_blocks: [ 2, 2, 2, 2 ]
    channel_mult: [ 1, 2, 4, 4 ]
    # disable_self_attentions: [ False, False, False, False ]  # converts the self-attention to a cross-attention layer if true
    num_heads: 8
    use_spatial_transformer: True
    transformer_depth: 1
    context_dim: 768
    use_checkpoint: True
    legacy: False

#########
# v1 2d #
#########

openai_unet_2d_v1:
  type: openai_unet_2d_next
  args:
    in_channels: 4
    out_channels: 4
    model_channels: 320
    attention_resolutions: [ 4, 2, 1 ]
    num_res_blocks: [ 2, 2, 2, 2 ]
    channel_mult: [ 1, 2, 4, 4 ]
    num_heads: 8
    context_dim: 768
    use_checkpoint: False
    parts: [global, data, context]