[BUG] Fix convert_vae_pt_to_diffusers bug (#11078)

* fix attention

* Apply style fixes

---------
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

scripts/convert_vae_pt_to_diffusers.py

@@ -53,7 +53,12 @@ def custom_convert_ldm_vae_checkpoint(checkpoint, config):
     }
 
     for i in range(num_down_blocks):
-        resnets = [key for key in down_blocks[i] if f"down.{i}" in key and f"down.{i}.downsample" not in key]
+        resnets = [
+            key
+            for key in down_blocks[i]
+            if f"down.{i}" in key and f"down.{i}.downsample" not in key and "attn" not in key
+        ]
+        attentions = [key for key in down_blocks[i] if f"down.{i}.attn" in key]
 
         if f"encoder.down.{i}.downsample.conv.weight" in vae_state_dict:
             new_checkpoint[f"encoder.down_blocks.{i}.downsamplers.0.conv.weight"] = vae_state_dict.pop(
@@ -67,6 +72,10 @@ def custom_convert_ldm_vae_checkpoint(checkpoint, config):
         meta_path = {"old": f"down.{i}.block", "new": f"down_blocks.{i}.resnets"}
         assign_to_checkpoint(paths, new_checkpoint, vae_state_dict, additional_replacements=[meta_path], config=config)
 
+        paths = renew_vae_attention_paths(attentions)
+        meta_path = {"old": f"down.{i}.attn", "new": f"down_blocks.{i}.attentions"}
+        assign_to_checkpoint(paths, new_checkpoint, vae_state_dict, additional_replacements=[meta_path], config=config)
+
     mid_resnets = [key for key in vae_state_dict if "encoder.mid.block" in key]
     num_mid_res_blocks = 2
     for i in range(1, num_mid_res_blocks + 1):
@@ -85,8 +94,11 @@ def custom_convert_ldm_vae_checkpoint(checkpoint, config):
     for i in range(num_up_blocks):
         block_id = num_up_blocks - 1 - i
         resnets = [
-            key for key in up_blocks[block_id] if f"up.{block_id}" in key and f"up.{block_id}.upsample" not in key
+            key
+            for key in up_blocks[block_id]
+            if f"up.{block_id}" in key and f"up.{block_id}.upsample" not in key and "attn" not in key
         ]
+        attentions = [key for key in up_blocks[block_id] if f"up.{block_id}.attn" in key]
 
         if f"decoder.up.{block_id}.upsample.conv.weight" in vae_state_dict:
             new_checkpoint[f"decoder.up_blocks.{i}.upsamplers.0.conv.weight"] = vae_state_dict[
@@ -100,6 +112,10 @@ def custom_convert_ldm_vae_checkpoint(checkpoint, config):
         meta_path = {"old": f"up.{block_id}.block", "new": f"up_blocks.{i}.resnets"}
         assign_to_checkpoint(paths, new_checkpoint, vae_state_dict, additional_replacements=[meta_path], config=config)
 
+        paths = renew_vae_attention_paths(attentions)
+        meta_path = {"old": f"up.{block_id}.attn", "new": f"up_blocks.{i}.attentions"}
+        assign_to_checkpoint(paths, new_checkpoint, vae_state_dict, additional_replacements=[meta_path], config=config)
+
     mid_resnets = [key for key in vae_state_dict if "decoder.mid.block" in key]
     num_mid_res_blocks = 2
     for i in range(1, num_mid_res_blocks + 1):

src/diffusers/pipelines/stable_diffusion/convert_from_ckpt.py

@@ -350,8 +350,14 @@ def create_vae_diffusers_config(original_config, image_size: int):
     _ = original_config["model"]["params"]["first_stage_config"]["params"]["embed_dim"]
 
     block_out_channels = [vae_params["ch"] * mult for mult in vae_params["ch_mult"]]
-    down_block_types = ["DownEncoderBlock2D"] * len(block_out_channels)
-    up_block_types = ["UpDecoderBlock2D"] * len(block_out_channels)
+    down_block_types = [
+        "DownEncoderBlock2D" if image_size // 2**i not in vae_params["attn_resolutions"] else "AttnDownEncoderBlock2D"
+        for i, _ in enumerate(block_out_channels)
+    ]
+    up_block_types = [
+        "UpDecoderBlock2D" if image_size // 2**i not in vae_params["attn_resolutions"] else "AttnUpDecoderBlock2D"
+        for i, _ in enumerate(block_out_channels)
+    ][::-1]
 
     config = {
         "sample_size": image_size,