Load controlnet in fp8 if weights are in fp8.

comfy/controlnet.py

@@ -400,19 +400,22 @@ class ControlLora(ControlNet):
 def controlnet_config(sd, model_options={}):
     model_config = comfy.model_detection.model_config_from_unet(sd, "", True)
 
-    supported_inference_dtypes = model_config.supported_inference_dtypes
+    unet_dtype = model_options.get("dtype", None)
+    if unet_dtype is None:
+        weight_dtype = comfy.utils.weight_dtype(sd)
+
+        supported_inference_dtypes = list(model_config.supported_inference_dtypes)
+        if weight_dtype is not None:
+            supported_inference_dtypes.append(weight_dtype)
+
+        unet_dtype = comfy.model_management.unet_dtype(model_params=-1, supported_dtypes=supported_inference_dtypes)
 
-    controlnet_config = model_config.unet_config
-    unet_dtype = model_options.get("dtype", comfy.model_management.unet_dtype(supported_dtypes=supported_inference_dtypes))
     load_device = comfy.model_management.get_torch_device()
     manual_cast_dtype = comfy.model_management.unet_manual_cast(unet_dtype, load_device)
 
     operations = model_options.get("custom_operations", None)
     if operations is None:
-        if manual_cast_dtype is not None:
-            operations = comfy.ops.manual_cast
-        else:
-            operations = comfy.ops.disable_weight_init
+        operations = comfy.ops.pick_operations(unet_dtype, manual_cast_dtype, disable_fast_fp8=True)
 
     offload_device = comfy.model_management.unet_offload_device()
     return model_config, operations, load_device, unet_dtype, manual_cast_dtype, offload_device
@@ -583,22 +586,30 @@ def load_controlnet_state_dict(state_dict, model=None, model_options={}):
 
     if controlnet_config is None:
         model_config = comfy.model_detection.model_config_from_unet(controlnet_data, prefix, True)
-        supported_inference_dtypes = model_config.supported_inference_dtypes
+        supported_inference_dtypes = list(model_config.supported_inference_dtypes)
         controlnet_config = model_config.unet_config
 
-    load_device = comfy.model_management.get_torch_device()
+    unet_dtype = model_options.get("dtype", None)
+    if unet_dtype is None:
+        weight_dtype = comfy.utils.weight_dtype(controlnet_data)
+
         if supported_inference_dtypes is None:
-        unet_dtype = comfy.model_management.unet_dtype()
-    else:
-        unet_dtype = comfy.model_management.unet_dtype(supported_dtypes=supported_inference_dtypes)
+            supported_inference_dtypes = [comfy.model_management.unet_dtype()]
+
+        if weight_dtype is not None:
+            supported_inference_dtypes.append(weight_dtype)
+
+        unet_dtype = comfy.model_management.unet_dtype(model_params=-1, supported_dtypes=supported_inference_dtypes)
+
+    load_device = comfy.model_management.get_torch_device()
 
     manual_cast_dtype = comfy.model_management.unet_manual_cast(unet_dtype, load_device)
-    if manual_cast_dtype is not None:
-        controlnet_config["operations"] = comfy.ops.manual_cast
-    if "custom_operations" in model_options:
-        controlnet_config["operations"] = model_options["custom_operations"]
-    if "dtype" in model_options:
-        controlnet_config["dtype"] = model_options["dtype"]
+    operations = model_options.get("custom_operations", None)
+    if operations is None:
+        operations = comfy.ops.pick_operations(unet_dtype, manual_cast_dtype)
+
+    controlnet_config["operations"] = operations
+    controlnet_config["dtype"] = unet_dtype
     controlnet_config["device"] = comfy.model_management.unet_offload_device()
     controlnet_config.pop("out_channels")
     controlnet_config["hint_channels"] = controlnet_data["{}input_hint_block.0.weight".format(prefix)].shape[1]

comfy/model_management.py

@@ -626,6 +626,8 @@ def maximum_vram_for_weights(device=None):
     return (get_total_memory(device) * 0.88 - minimum_inference_memory())
 
 def unet_dtype(device=None, model_params=0, supported_dtypes=[torch.float16, torch.bfloat16, torch.float32]):
+    if model_params < 0:
+        model_params = 1000000000000000000000
     if args.bf16_unet:
         return torch.bfloat16
     if args.fp16_unet:

comfy/ops.py

@@ -300,10 +300,10 @@ class fp8_ops(manual_cast):
             return torch.nn.functional.linear(input, weight, bias)
 
 
-def pick_operations(weight_dtype, compute_dtype, load_device=None):
+def pick_operations(weight_dtype, compute_dtype, load_device=None, disable_fast_fp8=False):
     if compute_dtype is None or weight_dtype == compute_dtype:
         return disable_weight_init
-    if args.fast:
+    if args.fast and not disable_fast_fp8:
         if comfy.model_management.supports_fp8_compute(load_device):
             return fp8_ops
     return manual_cast