Flux Control LoRA

src/diffusers/loaders/lora_conversion_utils.py

@@ -663,3 +663,309 @@ def handle_qkv(sds_sd, ait_sd, sds_key, ait_keys, dims=None):
         raise ValueError(f"`old_state_dict` should be at this point but has: {list(old_state_dict.keys())}.")
 
     return new_state_dict
+
+
+def _convert_bfl_flux_control_lora_to_diffusers(original_state_dict):
+    converted_state_dict = {}
+    original_state_dict_keys = list(original_state_dict.keys())
+    num_layers = 19
+    num_single_layers = 38
+    inner_dim = 3072
+    mlp_ratio = 4.0
+
+    def swap_scale_shift(weight):
+        shift, scale = weight.chunk(2, dim=0)
+        new_weight = torch.cat([scale, shift], dim=0)
+        return new_weight
+
+    for lora_key in ["lora_A", "lora_B"]:
+        ## time_text_embed.timestep_embedder <-  time_in
+        converted_state_dict[
+            f"time_text_embed.timestep_embedder.linear_1.{lora_key}.weight"
+        ] = original_state_dict.pop(f"time_in.in_layer.{lora_key}.weight")
+        if f"time_in.in_layer.{lora_key}.bias" in original_state_dict_keys:
+            converted_state_dict[
+                f"time_text_embed.timestep_embedder.linear_1.{lora_key}.bias"
+            ] = original_state_dict.pop(f"time_in.in_layer.{lora_key}.bias")
+
+        converted_state_dict[
+            f"time_text_embed.timestep_embedder.linear_2.{lora_key}.weight"
+        ] = original_state_dict.pop(f"time_in.out_layer.{lora_key}.weight")
+        if f"time_in.out_layer.{lora_key}.bias" in original_state_dict_keys:
+            converted_state_dict[
+                f"time_text_embed.timestep_embedder.linear_2.{lora_key}.bias"
+            ] = original_state_dict.pop(f"time_in.out_layer.{lora_key}.bias")
+
+        ## time_text_embed.text_embedder <- vector_in
+        converted_state_dict[f"time_text_embed.text_embedder.linear_1.{lora_key}.weight"] = original_state_dict.pop(
+            f"vector_in.in_layer.{lora_key}.weight"
+        )
+        if f"vector_in.in_layer.{lora_key}.bias" in original_state_dict_keys:
+            converted_state_dict[f"time_text_embed.text_embedder.linear_1.{lora_key}.bias"] = original_state_dict.pop(
+                f"vector_in.in_layer.{lora_key}.bias"
+            )
+
+        converted_state_dict[f"time_text_embed.text_embedder.linear_2.{lora_key}.weight"] = original_state_dict.pop(
+            f"vector_in.out_layer.{lora_key}.weight"
+        )
+        if f"vector_in.out_layer.{lora_key}.bias" in original_state_dict_keys:
+            converted_state_dict[f"time_text_embed.text_embedder.linear_2.{lora_key}.bias"] = original_state_dict.pop(
+                f"vector_in.out_layer.{lora_key}.bias"
+            )
+
+        # guidance
+        has_guidance = any("guidance" in k for k in original_state_dict)
+        if has_guidance:
+            converted_state_dict[
+                f"time_text_embed.guidance_embedder.linear_1.{lora_key}.weight"
+            ] = original_state_dict.pop(f"guidance_in.in_layer.{lora_key}.weight")
+            if f"guidance_in.in_layer.{lora_key}.bias" in original_state_dict_keys:
+                converted_state_dict[
+                    f"time_text_embed.guidance_embedder.linear_1.{lora_key}.bias"
+                ] = original_state_dict.pop(f"guidance_in.in_layer.{lora_key}.bias")
+
+            converted_state_dict[
+                f"time_text_embed.guidance_embedder.linear_2.{lora_key}.weight"
+            ] = original_state_dict.pop(f"guidance_in.out_layer.{lora_key}.weight")
+            if f"guidance_in.out_layer.{lora_key}.bias" in original_state_dict_keys:
+                converted_state_dict[
+                    f"time_text_embed.guidance_embedder.linear_2.{lora_key}.bias"
+                ] = original_state_dict.pop(f"guidance_in.out_layer.{lora_key}.bias")
+
+        # context_embedder
+        converted_state_dict[f"context_embedder.{lora_key}.weight"] = original_state_dict.pop(
+            f"txt_in.{lora_key}.weight"
+        )
+        if f"txt_in.{lora_key}.bias" in original_state_dict_keys:
+            converted_state_dict[f"context_embedder.{lora_key}.bias"] = original_state_dict.pop(
+                f"txt_in.{lora_key}.bias"
+            )
+
+        # x_embedder
+        converted_state_dict[f"x_embedder.{lora_key}.weight"] = original_state_dict.pop(f"img_in.{lora_key}.weight")
+        if f"img_in.{lora_key}.bias" in original_state_dict_keys:
+            converted_state_dict[f"x_embedder.{lora_key}.bias"] = original_state_dict.pop(f"img_in.{lora_key}.bias")
+
+    # double transformer blocks
+    for i in range(num_layers):
+        block_prefix = f"transformer_blocks.{i}."
+
+        for lora_key, lora_key in zip(["lora_A", "lora_B"], ["lora_A", "lora_B"]):
+            # norms
+            converted_state_dict[f"{block_prefix}norm1.linear.{lora_key}.weight"] = original_state_dict.pop(
+                f"double_blocks.{i}.img_mod.lin.{lora_key}.weight"
+            )
+            if f"double_blocks.{i}.img_mod.lin.{lora_key}.bias" in original_state_dict_keys:
+                converted_state_dict[f"{block_prefix}norm1.linear.{lora_key}.bias"] = original_state_dict.pop(
+                    f"double_blocks.{i}.img_mod.lin.{lora_key}.bias"
+                )
+
+            converted_state_dict[f"{block_prefix}norm1_context.linear.{lora_key}.weight"] = original_state_dict.pop(
+                f"double_blocks.{i}.txt_mod.lin.{lora_key}.weight"
+            )
+            if f"double_blocks.{i}.txt_mod.lin.{lora_key}.bias" in original_state_dict_keys:
+                converted_state_dict[f"{block_prefix}norm1_context.linear.{lora_key}.bias"] = original_state_dict.pop(
+                    f"double_blocks.{i}.txt_mod.lin.{lora_key}.bias"
+                )
+
+            # Q, K, V
+            if lora_key == "lora_A":
+                sample_lora_weight = original_state_dict.pop(f"double_blocks.{i}.img_attn.qkv.{lora_key}.weight")
+                converted_state_dict[f"{block_prefix}attn.to_v.{lora_key}.weight"] = torch.cat([sample_lora_weight])
+                converted_state_dict[f"{block_prefix}attn.to_q.{lora_key}.weight"] = torch.cat([sample_lora_weight])
+                converted_state_dict[f"{block_prefix}attn.to_k.{lora_key}.weight"] = torch.cat([sample_lora_weight])
+
+                context_lora_weight = original_state_dict.pop(f"double_blocks.{i}.txt_attn.qkv.{lora_key}.weight")
+                converted_state_dict[f"{block_prefix}attn.add_q_proj.{lora_key}.weight"] = torch.cat(
+                    [context_lora_weight]
+                )
+                converted_state_dict[f"{block_prefix}attn.add_k_proj.{lora_key}.weight"] = torch.cat(
+                    [context_lora_weight]
+                )
+                converted_state_dict[f"{block_prefix}attn.add_v_proj.{lora_key}.weight"] = torch.cat(
+                    [context_lora_weight]
+                )
+            else:
+                sample_q, sample_k, sample_v = torch.chunk(
+                    original_state_dict.pop(f"double_blocks.{i}.img_attn.qkv.{lora_key}.weight"), 3, dim=0
+                )
+                converted_state_dict[f"{block_prefix}attn.to_q.{lora_key}.weight"] = torch.cat([sample_q])
+                converted_state_dict[f"{block_prefix}attn.to_k.{lora_key}.weight"] = torch.cat([sample_k])
+                converted_state_dict[f"{block_prefix}attn.to_v.{lora_key}.weight"] = torch.cat([sample_v])
+
+                context_q, context_k, context_v = torch.chunk(
+                    original_state_dict.pop(f"double_blocks.{i}.txt_attn.qkv.{lora_key}.weight"), 3, dim=0
+                )
+                converted_state_dict[f"{block_prefix}attn.add_q_proj.{lora_key}.weight"] = torch.cat([context_q])
+                converted_state_dict[f"{block_prefix}attn.add_k_proj.{lora_key}.weight"] = torch.cat([context_k])
+                converted_state_dict[f"{block_prefix}attn.add_v_proj.{lora_key}.weight"] = torch.cat([context_v])
+
+            if f"double_blocks.{i}.img_attn.qkv.{lora_key}.bias" in original_state_dict_keys:
+                sample_q_bias, sample_k_bias, sample_v_bias = torch.chunk(
+                    original_state_dict.pop(f"double_blocks.{i}.img_attn.qkv.{lora_key}.bias"), 3, dim=0
+                )
+                converted_state_dict[f"{block_prefix}attn.to_q.{lora_key}.bias"] = torch.cat([sample_q_bias])
+                converted_state_dict[f"{block_prefix}attn.to_k.{lora_key}.bias"] = torch.cat([sample_k_bias])
+                converted_state_dict[f"{block_prefix}attn.to_v.{lora_key}.bias"] = torch.cat([sample_v_bias])
+
+            if f"double_blocks.{i}.txt_attn.qkv.{lora_key}.bias" in original_state_dict_keys:
+                context_q_bias, context_k_bias, context_v_bias = torch.chunk(
+                    original_state_dict.pop(f"double_blocks.{i}.txt_attn.qkv.{lora_key}.bias"), 3, dim=0
+                )
+                converted_state_dict[f"{block_prefix}attn.add_q_proj.{lora_key}.bias"] = torch.cat([context_q_bias])
+                converted_state_dict[f"{block_prefix}attn.add_k_proj.{lora_key}.bias"] = torch.cat([context_k_bias])
+                converted_state_dict[f"{block_prefix}attn.add_v_proj.{lora_key}.bias"] = torch.cat([context_v_bias])
+
+            # ff img_mlp
+            converted_state_dict[f"{block_prefix}ff.net.0.proj.{lora_key}.weight"] = original_state_dict.pop(
+                f"double_blocks.{i}.img_mlp.0.{lora_key}.weight"
+            )
+            if f"double_blocks.{i}.img_mlp.0.{lora_key}.bias" in original_state_dict_keys:
+                converted_state_dict[f"{block_prefix}ff.net.0.proj.{lora_key}.bias"] = original_state_dict.pop(
+                    f"double_blocks.{i}.img_mlp.0.{lora_key}.bias"
+                )
+
+            converted_state_dict[f"{block_prefix}ff.net.2.{lora_key}.weight"] = original_state_dict.pop(
+                f"double_blocks.{i}.img_mlp.2.{lora_key}.weight"
+            )
+            if f"double_blocks.{i}.img_mlp.2.{lora_key}.bias" in original_state_dict_keys:
+                converted_state_dict[f"{block_prefix}ff.net.2.{lora_key}.bias"] = original_state_dict.pop(
+                    f"double_blocks.{i}.img_mlp.2.{lora_key}.bias"
+                )
+
+            converted_state_dict[f"{block_prefix}ff_context.net.0.proj.{lora_key}.weight"] = original_state_dict.pop(
+                f"double_blocks.{i}.txt_mlp.0.{lora_key}.weight"
+            )
+            if f"double_blocks.{i}.txt_mlp.0.{lora_key}.bias" in original_state_dict_keys:
+                converted_state_dict[f"{block_prefix}ff_context.net.0.proj.{lora_key}.bias"] = original_state_dict.pop(
+                    f"double_blocks.{i}.txt_mlp.0.{lora_key}.bias"
+                )
+
+            converted_state_dict[f"{block_prefix}ff_context.net.2.{lora_key}.weight"] = original_state_dict.pop(
+                f"double_blocks.{i}.txt_mlp.2.{lora_key}.weight"
+            )
+            if f"double_blocks.{i}.txt_mlp.2.{lora_key}.bias" in original_state_dict_keys:
+                converted_state_dict[f"{block_prefix}ff_context.net.2.{lora_key}.bias"] = original_state_dict.pop(
+                    f"double_blocks.{i}.txt_mlp.2.{lora_key}.bias"
+                )
+
+            # output projections.
+            converted_state_dict[f"{block_prefix}attn.to_out.0.{lora_key}.weight"] = original_state_dict.pop(
+                f"double_blocks.{i}.img_attn.proj.{lora_key}.weight"
+            )
+            if f"double_blocks.{i}.img_attn.proj.{lora_key}.bias" in original_state_dict_keys:
+                converted_state_dict[f"{block_prefix}attn.to_out.0.{lora_key}.bias"] = original_state_dict.pop(
+                    f"double_blocks.{i}.img_attn.proj.{lora_key}.bias"
+                )
+            converted_state_dict[f"{block_prefix}attn.to_add_out.{lora_key}.weight"] = original_state_dict.pop(
+                f"double_blocks.{i}.txt_attn.proj.{lora_key}.weight"
+            )
+            if f"double_blocks.{i}.txt_attn.proj.{lora_key}.bias" in original_state_dict_keys:
+                converted_state_dict[f"{block_prefix}attn.to_add_out.{lora_key}.bias"] = original_state_dict.pop(
+                    f"double_blocks.{i}.txt_attn.proj.{lora_key}.bias"
+                )
+
+        # qk_norm
+        converted_state_dict[f"{block_prefix}attn.norm_q.weight"] = original_state_dict.pop(
+            f"double_blocks.{i}.img_attn.norm.query_norm.scale"
+        )
+        converted_state_dict[f"{block_prefix}attn.norm_k.weight"] = original_state_dict.pop(
+            f"double_blocks.{i}.img_attn.norm.key_norm.scale"
+        )
+        converted_state_dict[f"{block_prefix}attn.norm_added_q.weight"] = original_state_dict.pop(
+            f"double_blocks.{i}.txt_attn.norm.query_norm.scale"
+        )
+        converted_state_dict[f"{block_prefix}attn.norm_added_k.weight"] = original_state_dict.pop(
+            f"double_blocks.{i}.txt_attn.norm.key_norm.scale"
+        )
+
+    # single transfomer blocks
+    for i in range(num_single_layers):
+        block_prefix = f"single_transformer_blocks.{i}."
+
+        for lora_key in ["lora_A", "lora_B"]:
+            # norm.linear  <- single_blocks.0.modulation.lin
+            converted_state_dict[f"{block_prefix}norm.linear.{lora_key}.weight"] = original_state_dict.pop(
+                f"single_blocks.{i}.modulation.lin.{lora_key}.weight"
+            )
+            if f"single_blocks.{i}.modulation.lin.{lora_key}.bias" in original_state_dict_keys:
+                converted_state_dict[f"{block_prefix}norm.linear.{lora_key}.bias"] = original_state_dict.pop(
+                    f"single_blocks.{i}.modulation.lin.{lora_key}.bias"
+                )
+
+            # Q, K, V, mlp
+            mlp_hidden_dim = int(inner_dim * mlp_ratio)
+            split_size = (inner_dim, inner_dim, inner_dim, mlp_hidden_dim)
+
+            if lora_key == "lora_A":
+                lora_weight = original_state_dict.pop(f"single_blocks.{i}.linear1.{lora_key}.weight")
+                converted_state_dict[f"{block_prefix}attn.to_q.{lora_key}.weight"] = torch.cat([lora_weight])
+                converted_state_dict[f"{block_prefix}attn.to_k.{lora_key}.weight"] = torch.cat([lora_weight])
+                converted_state_dict[f"{block_prefix}attn.to_v.{lora_key}.weight"] = torch.cat([lora_weight])
+                converted_state_dict[f"{block_prefix}proj_mlp.{lora_key}.weight"] = torch.cat([lora_weight])
+
+                if f"single_blocks.{i}.linear1.{lora_key}.bias" in original_state_dict_keys:
+                    lora_bias = original_state_dict.pop(f"single_blocks.{i}.linear1.{lora_key}.bias")
+                    converted_state_dict[f"{block_prefix}attn.to_q.{lora_key}.bias"] = torch.cat([lora_bias])
+                    converted_state_dict[f"{block_prefix}attn.to_k.{lora_key}.bias"] = torch.cat([lora_bias])
+                    converted_state_dict[f"{block_prefix}attn.to_v.{lora_key}.bias"] = torch.cat([lora_bias])
+                    converted_state_dict[f"{block_prefix}proj_mlp.{lora_key}.bias"] = torch.cat([lora_bias])
+            else:
+                q, k, v, mlp = torch.split(
+                    original_state_dict.pop(f"single_blocks.{i}.linear1.{lora_key}.weight"), split_size, dim=0
+                )
+                converted_state_dict[f"{block_prefix}attn.to_q.{lora_key}.weight"] = torch.cat([q])
+                converted_state_dict[f"{block_prefix}attn.to_k.{lora_key}.weight"] = torch.cat([k])
+                converted_state_dict[f"{block_prefix}attn.to_v.{lora_key}.weight"] = torch.cat([v])
+                converted_state_dict[f"{block_prefix}proj_mlp.{lora_key}.weight"] = torch.cat([mlp])
+
+                if f"single_blocks.{i}.linear1.{lora_key}.bias" in original_state_dict_keys:
+                    q_bias, k_bias, v_bias, mlp_bias = torch.split(
+                        original_state_dict.pop(f"single_blocks.{i}.linear1.{lora_key}.bias"), split_size, dim=0
+                    )
+                    converted_state_dict[f"{block_prefix}attn.to_q.{lora_key}.bias"] = torch.cat([q_bias])
+                    converted_state_dict[f"{block_prefix}attn.to_k.{lora_key}.bias"] = torch.cat([k_bias])
+                    converted_state_dict[f"{block_prefix}attn.to_v.{lora_key}.bias"] = torch.cat([v_bias])
+                    converted_state_dict[f"{block_prefix}proj_mlp.{lora_key}.bias"] = torch.cat([mlp_bias])
+
+            # output projections.
+            converted_state_dict[f"{block_prefix}proj_out.{lora_key}.weight"] = original_state_dict.pop(
+                f"single_blocks.{i}.linear2.{lora_key}.weight"
+            )
+            if f"single_blocks.{i}.linear2.{lora_key}.bias" in original_state_dict_keys:
+                converted_state_dict[f"{block_prefix}proj_out.{lora_key}.bias"] = original_state_dict.pop(
+                    f"single_blocks.{i}.linear2.{lora_key}.bias"
+                )
+
+        # qk norm
+        converted_state_dict[f"{block_prefix}attn.norm_q.weight"] = original_state_dict.pop(
+            f"single_blocks.{i}.norm.query_norm.scale"
+        )
+        converted_state_dict[f"{block_prefix}attn.norm_k.weight"] = original_state_dict.pop(
+            f"single_blocks.{i}.norm.key_norm.scale"
+        )
+
+    for lora_key in ["lora_A", "lora_B"]:
+        converted_state_dict[f"proj_out.{lora_key}.weight"] = original_state_dict.pop(
+            f"final_layer.linear.{lora_key}.weight"
+        )
+        if f"final_layer.linear.{lora_key}.bias" in original_state_dict_keys:
+            converted_state_dict[f"proj_out.{lora_key}.bias"] = original_state_dict.pop(
+                f"final_layer.linear.{lora_key}.bias"
+            )
+
+        converted_state_dict[f"norm_out.linear.{lora_key}.weight"] = swap_scale_shift(
+            original_state_dict.pop(f"final_layer.adaLN_modulation.1.{lora_key}.weight")
+        )
+        if f"final_layer.adaLN_modulation.1.{lora_key}.bias" in original_state_dict_keys:
+            converted_state_dict[f"norm_out.linear.{lora_key}.bias"] = swap_scale_shift(
+                original_state_dict.pop(f"final_layer.adaLN_modulation.1.{lora_key}.bias")
+            )
+
+    if len(original_state_dict) > 0:
+        raise ValueError(f"`original_state_dict` should be empty at this point but has {original_state_dict.keys()=}.")
+
+    for key in list(converted_state_dict.keys()):
+        converted_state_dict[f"transformer.{key}"] = converted_state_dict.pop(key)
+
+    return converted_state_dict