Adding LCM (Latent-Consistency-Models)

src/imagen_hub/infermodels/__init__.py

@@ -1,7 +1,7 @@
 
 # ==========================================================
 # Text-to-Image Generation
-from .sd import SD, OpenJourney
+from .sd import SD, OpenJourney, LCM
 from .sdxl import SDXL
 from .deepfloydif import DeepFloydIF
 from .dalle import DALLE2, DALLE3, StableUnCLIP

src/imagen_hub/infermodels/sd.py

@@ -101,3 +101,44 @@ def __init__(self, device="cuda", weight="prompthero/openjourney"):
 
     def infer_one_image(self, prompt: str = None, seed: int = 42):
         return super().infer_one_image(prompt, seed)
+
+class LCM():
+    def __init__(self, device="cuda", weight="SimianLuo/LCM_Dreamshaper_v7"):
+        """
+        A class for the Latent Consistency Model. Require diffusers >= 0.22
+        Reference: https://github.com/luosiallen/latent-consistency-model#latent-consistency-models
+
+        Args:
+            device (str, optional): The device on which the model should run. Default is "cuda".
+            weight (str, optional): The pretrained model weights for OpenJourney. Default is "SimianLuo/LCM_Dreamshaper_v7".
+        """
+        self.pipe = DiffusionPipeline.from_pretrained(
+            weight,
+            torch_dtype=torch.float16,
+        ).to(device)
+
+    def infer_one_image(self, prompt: str = None, seed: int = 42, num_inference_steps: int = 4):
+        """
+        Infer an image based on the given prompt and seed.
+
+        Args:
+            prompt (str, optional): The prompt for the image generation. Default is None.
+            seed (int, optional): The seed for random generator. Default is 42.
+            num_inference_steps (int, optional): inference steps. Recommend: 1~8 steps. Paper used 4.
+
+        Returns:
+            PIL.Image.Image: The inferred image.
+
+        Notes:
+            num_inference_steps can be set to 1~50 steps. LCM support fast inference even <= 4 steps.
+            (Max)I personally found 8 steps give a better result but the paper focus on using 4 steps.
+        """
+        generator = torch.manual_seed(seed)
+        images = self.pipe(prompt=prompt, 
+                            num_inference_steps=num_inference_steps, 
+                            guidance_scale=8.0, 
+                            lcm_origin_steps=50, 
+                            generator=generator,
+                            output_type="pil").images
+        return images[0]
+