feat(api): add option to reload CNet for conversion

api/onnx_web/convert/diffusion/diffusers.py

@@ -450,8 +450,8 @@ def convert_diffusion_diffusers(
         )
 
     cnet_path = None
-    if conversion.control and not single_vae:
-        # if converting only the CNet, the rest of the model has already been converted
+    if conversion.control and not single_vae and conversion.share_unet:
+        logger.debug("converting CNet from loaded UNet")
         cnet_path = convert_diffusion_diffusers_cnet(
             conversion,
             source,
@@ -465,12 +465,27 @@ def convert_diffusion_diffusers(
             unet=pipeline.unet,
             v2=v2,
         )
-    else:
-        logger.debug("skipping CNet for single-VAE model")
 
     del pipeline.unet
     run_gc()
 
+    if conversion.control and not single_vae and not conversion.share_unet:
+        logger.info("loading and converting CNet")
+        cnet_path = convert_diffusion_diffusers_cnet(
+            conversion,
+            source,
+            device,
+            output_path,
+            dtype,
+            unet_in_channels,
+            unet_sample_size,
+            num_tokens,
+            text_hidden_size,
+            unet=None,
+            v2=v2,
+        )
+
+
     if cnet_path is not None:
         collate_cnet(cnet_path)
 

api/onnx_web/convert/utils.py

@@ -44,6 +44,7 @@ class ConversionContext(ServerContext):
         prune: Optional[List[str]] = None,
         control: bool = True,
         reload: bool = True,
+        share_unet: bool = True,
         **kwargs,
     ) -> None:
         super().__init__(model_path=model_path, cache_path=cache_path, **kwargs)
@@ -53,6 +54,7 @@ class ConversionContext(ServerContext):
         self.opset = opset
         self.prune = prune or []
         self.reload = reload
+        self.share_unet = share_unet
         self.token = token
 
         if device is not None:
@@ -66,8 +68,9 @@ class ConversionContext(ServerContext):
     def from_environ(cls):
         context = super().from_environ()
         context.control = get_boolean(environ, "ONNX_WEB_CONVERT_CONTROL", True)
-        context.opset = int(environ.get("ONNX_WEB_CONVERT_OPSET", DEFAULT_OPSET))
         context.reload = get_boolean(environ, "ONNX_WEB_CONVERT_RELOAD", True)
+        context.share_unet = get_boolean(environ, "ONNX_WEB_CONVERT_SHARE_UNET", True)
+        context.opset = int(environ.get("ONNX_WEB_CONVERT_OPSET", DEFAULT_OPSET))
         return context