Add instruct-pix2pix hijack

Allows loading instruct-pix2pix models via same method as inpainting models in sd_models.py and sd_hijack_ip2p.py

Adds ddpm_edit.py necessary for instruct-pix2pix

modules/sd_hijack_ip2p.py

@@ -0,0 +1,13 @@
+import collections
+import os.path
+import sys
+import gc
+import time
+
+def should_hijack_ip2p(checkpoint_info):
+    from modules import sd_models
+
+    ckpt_basename = os.path.basename(checkpoint_info.filename).lower()
+    cfg_basename = os.path.basename(sd_models.find_checkpoint_config(checkpoint_info)).lower()
+
+    return "pix2pix" in ckpt_basename and not "pix2pix" in cfg_basename

modules/sd_models.py

@@ -17,6 +17,7 @@ from ldm.util import instantiate_from_config
 from modules import shared, modelloader, devices, script_callbacks, sd_vae, sd_disable_initialization, errors, hashes
 from modules.paths import models_path
 from modules.sd_hijack_inpainting import do_inpainting_hijack, should_hijack_inpainting
+from modules.sd_hijack_ip2p import should_hijack_ip2p
 
 model_dir = "Stable-diffusion"
 model_path = os.path.abspath(os.path.join(models_path, model_dir))
@@ -365,6 +366,15 @@ def load_model(checkpoint_info=None):
         sd_config.model.params.unet_config.params.in_channels = 9
         sd_config.model.params.finetune_keys = None
 
+    if should_hijack_ip2p(checkpoint_info):
+        sd_config.model.target = "modules.models.diffusion.ddpm_edit.LatentDiffusion"
+        sd_config.model.params.conditioning_key = "hybrid"
+        sd_config.model.params.first_stage_key = "edited"
+        sd_config.model.params.cond_stage_key = "edit"
+        sd_config.model.params.image_size = 16
+        sd_config.model.params.unet_config.params.in_channels = 8
+        sd_config.model.params.unet_config.params.out_channels = 4
+
     if not hasattr(sd_config.model.params, "use_ema"):
         sd_config.model.params.use_ema = False
 
@@ -429,7 +439,7 @@ def reload_model_weights(sd_model=None, info=None):
 
     checkpoint_config = find_checkpoint_config(current_checkpoint_info)
 
-    if current_checkpoint_info is None or checkpoint_config != find_checkpoint_config(checkpoint_info) or should_hijack_inpainting(checkpoint_info) != should_hijack_inpainting(sd_model.sd_checkpoint_info):
+    if current_checkpoint_info is None or checkpoint_config != find_checkpoint_config(checkpoint_info) or should_hijack_inpainting(checkpoint_info) != should_hijack_inpainting(sd_model.sd_checkpoint_info) or should_hijack_ip2p(checkpoint_info) != should_hijack_ip2p(sd_model.sd_checkpoint_info):
         del sd_model
         checkpoints_loaded.clear()
         load_model(checkpoint_info)