diffusers: restore prompt weighting feature

Author: keturn

ldm/invoke/generator/diffusers_pipeline.py

@@ -11,6 +11,8 @@
 from diffusers.schedulers import DDIMScheduler, LMSDiscreteScheduler, PNDMScheduler
 from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer
 
+from ldm.modules.encoders.modules import WeightedFrozenCLIPEmbedder
+
 
 @dataclass
 class PipelineIntermediateState:
@@ -76,6 +78,11 @@ def __init__(
             safety_checker=safety_checker,
             feature_extractor=feature_extractor,
         )
+        # InvokeAI's interface for text embeddings and whatnot
+        self.clip_embedder = WeightedFrozenCLIPEmbedder(
+            tokenizer=self.tokenizer,
+            transformer=self.text_encoder
+        )
 
     def enable_attention_slicing(self, slice_size: Optional[Union[str, int]] = "auto"):
         r"""
@@ -312,27 +319,12 @@ def get_text_embeddings(self,
             text_embeddings = torch.cat([uncond_embeddings, text_embeddings])
         return text_embeddings
 
-    def get_learned_conditioning(self, c: List[List[str]], return_tokens=True,
-                                 fragment_weights=None, **kwargs):
+    @torch.inference_mode()
+    def get_learned_conditioning(self, c: List[List[str]], *, return_tokens=True, fragment_weights=None):
         """
         Compatibility function for ldm.models.diffusion.ddpm.LatentDiffusion.
         """
-        assert return_tokens == True
-        if fragment_weights:
-            weights = fragment_weights[0]
-            if any(weight != 1.0 for weight in weights):
-                warnings.warn(f"fragment weights not implemented yet {fragment_weights}", stacklevel=2)
-
-        if kwargs:
-            warnings.warn(f"unsupported args {kwargs}", stacklevel=2)
-
-        text_fragments = c[0]
-        text_input = self._tokenize(text_fragments)
-
-        with torch.inference_mode():
-            token_ids = text_input.input_ids.to(self.text_encoder.device)
-            text_embeddings = self.text_encoder(token_ids)[0]
-        return text_embeddings, text_input.input_ids
+        return self.clip_embedder.encode(c, return_tokens=return_tokens, fragment_weights=fragment_weights)
 
     @torch.inference_mode()
     def _tokenize(self, prompt: Union[str, List[str]]):

ldm/modules/encoders/modules.py

@@ -240,17 +240,17 @@ class FrozenCLIPEmbedder(AbstractEncoder):
     def __init__(
         self,
         version='openai/clip-vit-large-patch14',
-        device=choose_torch_device(),
         max_length=77,
+        tokenizer=None,
+        transformer=None,
     ):
         super().__init__()
-        self.tokenizer = CLIPTokenizer.from_pretrained(
+        self.tokenizer = tokenizer or CLIPTokenizer.from_pretrained(
             version, local_files_only=True
         )
-        self.transformer = CLIPTextModel.from_pretrained(
+        self.transformer = transformer or CLIPTextModel.from_pretrained(
             version, local_files_only=True
         )
-        self.device = device
         self.max_length = max_length
         self.freeze()
 
@@ -456,6 +456,10 @@ def forward(self, text, **kwargs):
     def encode(self, text, **kwargs):
         return self(text, **kwargs)
 
+    @property
+    def device(self):
+        return self.transformer.device
+
 class WeightedFrozenCLIPEmbedder(FrozenCLIPEmbedder):
 
     fragment_weights_key = "fragment_weights"