new transition engine and crossfeeding

gradio_ui.py

@@ -33,6 +33,13 @@ import gradio as gr
 import copy
 
 
+"""
+TODOS:
+    - clean parameter handling
+    - three buttons: diffuse A, diffuse B, make transition
+    - collapse for easy mode
+    - transition quality in terms of render time
+"""
 
 #%%
 
@@ -45,7 +52,7 @@ class BlendingFrontend():
             self.lb = LatentBlending(sdh)
             
         self.share = True
-        self.num_inference_steps = 20
+        self.num_inference_steps = 30
         self.depth_strength = 0.25
         self.seed1 = 42
         self.seed2 = 420
@@ -58,11 +65,13 @@ class BlendingFrontend():
         self.list_settings = []
         self.state_current = {}
         self.showing_current = True
-        self.branch1_influence = 0.02
+        self.branch1_influence = 0.1
+        self.branch1_mixing_depth = 0.3
         self.nmb_branches_final = 9
         self.nmb_imgs_show = 5 # don't change
         self.fps = 30
-        self.duration = 10
+        self.duration_video = 15
+        self.t_compute_max_allowed = 15
         self.dict_multi_trans = {}
         self.dict_multi_trans_include = {}
         self.multi_trans_currently_shown = []
@@ -79,114 +88,87 @@ class BlendingFrontend():
             self.width = 768
         
         # make dummy image
+    def save_empty_image(self):
         self.fp_img_empty = 'empty.jpg'
         Image.fromarray(np.zeros((self.height, self.width, 3), dtype=np.uint8)).save(self.fp_img_empty, quality=5)
         
-    def change_depth_strength(self, value):
-        self.depth_strength = value
-        print(f"changed depth_strength to {value}")
-    
-    def change_num_inference_steps(self, value):
-        self.num_inference_steps = value
-        print(f"changed num_inference_steps to {value}")
-        
-    def change_guidance_scale(self, value):
-        self.guidance_scale = value
-        self.lb.set_guidance_scale(value)
-        print(f"changed guidance_scale to {value}")
-        
-    def change_guidance_scale_mid_damper(self, value):
-        self.guidance_scale_mid_damper = value
-        print(f"changed guidance_scale_mid_damper to {value}")
-        
-    def change_mid_compression_scaler(self, value):
-        self.mid_compression_scaler = value
-        print(f"changed mid_compression_scaler to {value}")
-        
-    def change_branch1_influence(self, value):
-        self.branch1_influence = value
-        print(f"changed branch1_influence to {value}")
-    
-    def change_height(self, value):
-        self.height = value
-        print(f"changed height to {value}")
-        
-    def change_width(self, value):
-        self.width = value
-        print(f"changed width to {value}")
-        
-    def change_nmb_branches_final(self, value):
-        self.nmb_branches_final  = value
-        print(f"changed nmb_branches_final to {value}")
-        
-    def change_duration(self, value):
-        self.duration  = value
-        print(f"changed duration to {value}")
-        
-    def change_fps(self, value):
-        self.fps  = value
-        print(f"changed fps to {value}")
-        
-    def change_negative_prompt(self, value):
-        self.negative_prompt = value
-        
-    def change_seed1(self, value):
-        self.seed1 = int(value)
-        
-    def change_seed2(self, value):
-        self.seed2 = int(value)
         
     def randomize_seed1(self):
         seed = np.random.randint(0, 10000000)
-        self.change_seed1(seed)
+        self.seed1 = int(seed)
         print(f"randomize_seed1: new seed = {self.seed1}")
         return seed
         
     def randomize_seed2(self):
         seed = np.random.randint(0, 10000000)
-        self.change_seed2(seed)
+        self.seed2 = int(seed)
         print(f"randomize_seed2: new seed = {self.seed2}")
         return seed
         
     
-    def compute_transition(self, prompt1, prompt2):
+    def setup_lb(self, list_ui_elem):
-        self.prompt1 = prompt1
+        # Collect latent blending variables
-        self.prompt2 = prompt2
-        print("STARTING DIFFUSION!")
         self.state_current = self.get_state_dict()
+        self.lb.set_width(list_ui_elem[list_ui_keys.index('width')])
+        self.lb.set_height(list_ui_elem[list_ui_keys.index('height')])
+        self.lb.set_prompt1(list_ui_elem[list_ui_keys.index('prompt1')])
+        self.lb.set_prompt2(list_ui_elem[list_ui_keys.index('prompt2')])
+        self.lb.set_negative_prompt(list_ui_elem[list_ui_keys.index('negative_prompt')])
+        self.lb.guidance_scale = list_ui_elem[list_ui_keys.index('guidance_scale')]
+        self.lb.guidance_scale_mid_damper = list_ui_elem[list_ui_keys.index('guidance_scale_mid_damper')]
+        self.lb.branch1_influence = list_ui_elem[list_ui_keys.index('branch1_influence')]
+        self.lb.branch1_mixing_depth = list_ui_elem[list_ui_keys.index('branch1_mixing_depth')]
+        self.lb.t_compute_max_allowed = list_ui_elem[list_ui_keys.index('duration_compute')]
+        self.lb.num_inference_steps = list_ui_elem[list_ui_keys.index('num_inference_steps')]
+        self.lb.sdh.num_inference_steps = list_ui_elem[list_ui_keys.index('num_inference_steps')]
+        self.duration_video = list_ui_elem[list_ui_keys.index('duration_video')]
+        self.lb.seed1 = list_ui_elem[list_ui_keys.index('seed1')]
+        self.lb.seed2 = list_ui_elem[list_ui_keys.index('seed2')]
+        
+    
+    def compute_img1(self, *args):
+        list_ui_elem = args
+        self.setup_lb(list_ui_elem)
+        fp_img1 = f"img1_{get_time('second')}.jpg"
+        img1 = Image.fromarray(self.lb.compute_latents1(return_image=True))
+        img1.save(fp_img1)
+        self.save_empty_image()
+        return [fp_img1, self.fp_img_empty, self.fp_img_empty, self.fp_img_empty, self.fp_img_empty]
+    
+    def compute_img2(self, *args):
+        list_ui_elem = args
+        self.setup_lb(list_ui_elem)
+        fp_img2 = f"img2_{get_time('second')}.jpg"
+        img2 = Image.fromarray(self.lb.compute_latents2(return_image=True))
+        img2.save(fp_img2)
+        return [self.fp_img_empty, self.fp_img_empty, self.fp_img_empty, fp_img2]
+        
+    def compute_transition(self, *args):
+        list_ui_elem = args
+        self.setup_lb(list_ui_elem)
+        print("STARTING DIFFUSION!")
         if self.use_debug:
             list_imgs = [(255*np.random.rand(self.height,self.width,3)).astype(np.uint8) for l in range(5)]
             list_imgs = [Image.fromarray(l) for l in list_imgs]
             print("DONE! SENDING BACK RESULTS")
             return list_imgs
         
-        # Collect latent blending variables
-        self.lb.set_width(self.width)
-        self.lb.set_height(self.height)
-        self.lb.autosetup_branching(
-                depth_strength = self.depth_strength,
-                num_inference_steps = self.num_inference_steps,
-                nmb_branches_final = self.nmb_branches_final,
-                nmb_mindist = 3)
-        self.lb.set_prompt1(self.prompt1)
-        self.lb.set_prompt2(self.prompt2)
-        self.lb.set_negative_prompt(self.negative_prompt)
-        
-        self.lb.guidance_scale = self.guidance_scale
-        self.lb.guidance_scale_mid_damper = self.guidance_scale_mid_damper
-        self.lb.mid_compression_scaler = self.mid_compression_scaler
-        self.lb.branch1_influence = self.branch1_influence
         fixed_seeds = [self.seed1, self.seed2]
         
         # Run Latent Blending
-        imgs_transition = self.lb.run_transition(fixed_seeds=fixed_seeds)
+        imgs_transition = self.lb.run_transition(
+            recycle_img1=True, 
+            recycle_img2=True, 
+            num_inference_steps=self.num_inference_steps, 
+            depth_strength=self.depth_strength, 
+            fixed_seeds=fixed_seeds
+            )
         print(f"Latent Blending pass finished. Resulted in {len(imgs_transition)} images")
         
-        # Subselect the preview images (hard fixed to self.nmb_imgs_show=5)
+        # Subselect three preview images
-        assert np.mod((self.nmb_branches_final-self.nmb_imgs_show)/4, 1)==0, 'self.nmb_branches_final illegal value!'
+        idx_img_prev = np.round(np.linspace(0, len(imgs_transition)-1, 5)[1:-1]).astype(np.int32)
-        idx_list = np.linspace(0, self.nmb_branches_final-1, self.nmb_imgs_show).astype(np.int32)
         list_imgs_preview = []
-        for j in idx_list:
+        for j in idx_img_prev:
             list_imgs_preview.append(Image.fromarray(imgs_transition[j]))
             
         # Save the preview imgs as jpgs on disk so we are not sending umcompressed data around
@@ -198,7 +180,7 @@ class BlendingFrontend():
             self.list_fp_imgs_current.append(fp_img)
         
         # Insert cheap frames for the movie
-        imgs_transition_ext = add_frames_linear_interp(imgs_transition, self.duration, self.fps)
+        imgs_transition_ext = add_frames_linear_interp(imgs_transition, self.duration_video, self.fps)
 
         # Save as movie
         fp_movie = self.get_fp_movie(self.current_timestamp)
@@ -330,35 +312,44 @@ if __name__ == "__main__":
     sdh = StableDiffusionHolder(fp_ckpt)
     
     self = BlendingFrontend(sdh) # Yes this is possible in python and yes it is an awesome trick
+    # self = BlendingFrontend(None) # Yes this is possible in python and yes it is an awesome trick
+    
+    dict_ui_elem = {}
     
     with gr.Blocks() as demo:
         with gr.Row():
             prompt1 = gr.Textbox(label="prompt 1")
-            prompt2 = gr.Textbox(label="prompt 2")
             negative_prompt = gr.Textbox(label="negative prompt")          
+            prompt2 = gr.Textbox(label="prompt 2")
         
         with gr.Row():
-            nmb_branches_final = gr.Slider(5, 125, self.nmb_branches_final, step=4, label='nmb trans images', interactive=True) 
+            duration_compute = gr.Slider(10, 40, self.duration_video, step=1, label='compute budget for transition (seconds)', interactive=True) 
+            duration_video = gr.Slider(0.1, 30, self.duration_video, step=0.1, label='result video duration (seconds)', interactive=True) 
             height = gr.Slider(256, 2048, self.height, step=128, label='height', interactive=True)
             width = gr.Slider(256, 2048, self.width, step=128, label='width', interactive=True) 
             
-        with gr.Row():
+        with gr.Accordion("Advanced Settings (click to expand)", open=False):
-            num_inference_steps = gr.Slider(5, 100, self.num_inference_steps, step=1, label='num_inference_steps', interactive=True)
-            branch1_influence = gr.Slider(0.0, 1.0, self.branch1_influence, step=0.01, label='branch1_influence', interactive=True) 
-            guidance_scale = gr.Slider(1, 25, self.guidance_scale, step=0.1, label='guidance_scale', interactive=True) 
 
             with gr.Row():
                 depth_strength = gr.Slider(0.01, 0.99, self.depth_strength, step=0.01, label='depth_strength', interactive=True) 
-            duration = gr.Slider(0.1, 30, self.duration, step=0.1, label='video duration', interactive=True) 
+                branch1_influence = gr.Slider(0.0, 1.0, self.branch1_influence, step=0.01, label='branch1_influence', interactive=True) 
+                branch1_mixing_depth = gr.Slider(0.0, 1.0, self.branch1_mixing_depth, step=0.01, label='branch1_mixing_depth', interactive=True) 
+
+            with gr.Row():
+                num_inference_steps = gr.Slider(5, 100, self.num_inference_steps, step=1, label='num_inference_steps', interactive=True)
+                guidance_scale = gr.Slider(1, 25, self.guidance_scale, step=0.1, label='guidance_scale', interactive=True) 
                 guidance_scale_mid_damper = gr.Slider(0.01, 2.0, self.guidance_scale_mid_damper, step=0.01, label='guidance_scale_mid_damper', interactive=True) 
         
             with gr.Row():
-            seed1 = gr.Number(42, label="seed 1", interactive=True)
+                seed1 = gr.Number(420, label="seed 1", interactive=True)
                 b_newseed1 = gr.Button("randomize seed 1", variant='secondary')
                 seed2 = gr.Number(420, label="seed 2", interactive=True)
                 b_newseed2 = gr.Button("randomize seed 2", variant='secondary')
+                
         with gr.Row():
+            b_compute1 = gr.Button('compute first image', variant='primary')
             b_compute_transition = gr.Button('compute transition', variant='primary')
+            b_compute2 = gr.Button('compute last image', variant='primary')
         
         with gr.Row():
             img1 = gr.Image(label="1/5")
@@ -370,31 +361,40 @@ if __name__ == "__main__":
         with gr.Row():
             vid_transition = gr.Video()
         
-        # Bind the on-change methods
+        # Collect all UI elemts in list to easily pass as inputs
-        depth_strength.change(fn=self.change_depth_strength, inputs=depth_strength)
+        dict_ui_elem["prompt1"] = prompt1
-        num_inference_steps.change(fn=self.change_num_inference_steps, inputs=num_inference_steps)
+        dict_ui_elem["negative_prompt"] = negative_prompt
-        nmb_branches_final.change(fn=self.change_nmb_branches_final, inputs=nmb_branches_final)
+        dict_ui_elem["prompt2"] = prompt2
          
-        guidance_scale.change(fn=self.change_guidance_scale, inputs=guidance_scale)
+        dict_ui_elem["duration_compute"] = duration_compute
-        guidance_scale_mid_damper.change(fn=self.change_guidance_scale_mid_damper, inputs=guidance_scale_mid_damper)
+        dict_ui_elem["duration_video"] = duration_video
+        dict_ui_elem["height"] = height
+        dict_ui_elem["width"] = width
          
-        height.change(fn=self.change_height, inputs=height)
+        dict_ui_elem["depth_strength"] = depth_strength
-        width.change(fn=self.change_width, inputs=width)
+        dict_ui_elem["branch1_influence"] = branch1_influence
-        negative_prompt.change(fn=self.change_negative_prompt, inputs=negative_prompt)
+        dict_ui_elem["branch1_mixing_depth"] = branch1_mixing_depth
-        seed1.change(fn=self.change_seed1, inputs=seed1)
+        
-        seed2.change(fn=self.change_seed2, inputs=seed2)
+        dict_ui_elem["num_inference_steps"] = num_inference_steps
-        duration.change(fn=self.change_duration, inputs=duration)
+        dict_ui_elem["guidance_scale"] = guidance_scale
-        branch1_influence.change(fn=self.change_branch1_influence, inputs=branch1_influence)
+        dict_ui_elem["guidance_scale_mid_damper"] = guidance_scale_mid_damper
+        dict_ui_elem["seed1"] = seed1
+        dict_ui_elem["seed2"] = seed2
+        
+        # Convert to list, as gradio doesn't seem to accept dicts
+        list_ui_elem = []
+        list_ui_keys = []
+        for k in dict_ui_elem.keys():
+            list_ui_elem.append(dict_ui_elem[k])
+            list_ui_keys.append(k)
+        self.list_ui_keys = list_ui_keys
         
         b_newseed1.click(self.randomize_seed1, outputs=seed1)
         b_newseed2.click(self.randomize_seed2, outputs=seed2)
-        # b_stackforward.click(self.stack_forward, 
+        b_compute1.click(self.compute_img1, inputs=list_ui_elem, outputs=[img1, img2, img3, img4, img5])
-        #                      inputs=[prompt2, seed2], 
+        b_compute2.click(self.compute_img2, inputs=list_ui_elem, outputs=[img2, img3, img4, img5])
-        #                      outputs=[img1, img2, img3, img4, img5, prompt1, seed1, prompt2])
         b_compute_transition.click(self.compute_transition, 
-                                   inputs=[prompt1, prompt2],
+                                    inputs=list_ui_elem,
-                                   outputs=[img1, img2, img3, img4, img5, vid_transition])
+                                    outputs=[img2, img3, img4, vid_transition])
-        
-
         
     demo.launch(share=self.share, inbrowser=True, inline=False)

latent_blending.py

@@ -45,7 +45,7 @@ from ldm.util import instantiate_from_config
 from ldm.models.diffusion.ddpm import LatentUpscaleDiffusion, LatentInpaintDiffusion
 from stable_diffusion_holder import StableDiffusionHolder
 import yaml
-
+import lpips
 #%% 
 class LatentBlending():
     def __init__(
@@ -88,10 +88,13 @@ class LatentBlending():
         self.prompt1 = ""
         self.prompt2 = ""
         self.negative_prompt = ""
-        self.tree_latents = None
+        
+        self.tree_latents = [None, None]
         self.tree_fracts = None
+        self.idx_injection = []
         self.tree_status = None
         self.tree_final_imgs = []
+        
         self.list_nmb_branches_prev = []
         self.list_injection_idx_prev = []
         self.text_embedding1 = None
@@ -105,12 +108,15 @@ class LatentBlending():
         self.list_injection_idx = None
         self.list_nmb_branches = None
         self.branch1_influence = 0.0
-        self.branch1_fract_crossfeed = 0.65
+        self.branch1_mixing_depth = 0.65
         self.branch1_insertion_completed = False
         self.set_guidance_scale(guidance_scale)
         self.init_mode()
         self.multi_transition_img_first = None
         self.multi_transition_img_last = None
+        self.dt_per_diff = 0
+        
+        self.lpips = lpips.LPIPS(net='alex').cuda(self.device)
         
 
     def init_mode(self):
@@ -375,6 +381,187 @@ class LatentBlending():
             self.tree_status.append(['untouched']*nmb_branches)
         
     def run_transition(
+            self,
+            recycle_img1: Optional[bool] = False, 
+            recycle_img2: Optional[bool] = False, 
+            num_inference_steps: Optional[int] = 30,
+            depth_strength: Optional[float] = 0.3,
+            fixed_seeds: Optional[List[int]] = None,
+        ):
+        
+        # # FIXME: deal with these tree args later
+        # self.num_inference_steps = 30
+        # self.t_compute_max_allowed = 60
+        
+        # Sanity checks first
+        assert self.text_embedding1 is not None, 'Set the first text embedding with .set_prompt1(...) before'
+        assert self.text_embedding2 is not None, 'Set the second text embedding with .set_prompt2(...) before'
+        
+        # Random seeds
+        if fixed_seeds is not None:
+            if fixed_seeds == 'randomize':
+                fixed_seeds = list(np.random.randint(0, 1000000, 2).astype(np.int32))
+            else:
+                assert len(fixed_seeds)==2, "Supply a list with len = 2"
+        
+            self.seed1 = fixed_seeds[0]
+            self.seed2 = fixed_seeds[1]
+        
+        # Ensure correct num_inference_steps in holder
+        self.sdh.num_inference_steps = self.num_inference_steps
+        
+        # Compute / Recycle first image
+        if not recycle_img1:
+            list_latents1 = self.compute_latents1()
+        else:
+            # FIXME: check if latents there...
+            list_latents1 = self.tree_latents[0]
+            
+        # Compute / Recycle first image
+        if not recycle_img2:
+            list_latents2 = self.compute_latents2()
+        else:
+            # FIXME: check if latents there...
+            list_latents2 = self.tree_latents[-1]
+            
+        # Reset the tree, injecting the edge latents1/2 we just generated/recycled
+        self.tree_latents = [list_latents1, list_latents2]    
+        self.tree_fracts = [0.0, 1.0]
+        self.tree_final_imgs = [self.sdh.latent2image((self.tree_latents[0][-1])), self.sdh.latent2image((self.tree_latents[-1][-1]))]
+        self.tree_idx_injection = [0, 0]
+        
+        # Set up branching scheme (dependent on provided compute time)
+        idx_injection_base = int(round(self.num_inference_steps*depth_strength))
+        list_idx_injection = np.arange(idx_injection_base, self.num_inference_steps-1, 3)
+        list_nmb_stems = np.ones(len(list_idx_injection), dtype=np.int32)
+        t_compute = 0
+        while t_compute < self.t_compute_max_allowed:
+            list_compute_steps = self.num_inference_steps - list_idx_injection
+            list_compute_steps *= list_nmb_stems
+            t_compute = np.sum(list_compute_steps) * self.dt_per_diff
+            increase_done = False
+            for s_idx in range(len(list_nmb_stems)-1):
+                if list_nmb_stems[s_idx+1] / list_nmb_stems[s_idx] >= 2:
+                    list_nmb_stems[s_idx] += 1
+                    increase_done = True
+                    break
+            if not increase_done:
+                list_nmb_stems[-1] += 1
+            # print(f"t_compute {t_compute} list_nmb_stems {list_nmb_stems}")
+            
+        # Run iteratively
+        for s_idx in tqdm(range(len(list_idx_injection))):
+            nmb_stems = list_nmb_stems[s_idx]
+            idx_injection = list_idx_injection[s_idx]
+            
+            for i in range(nmb_stems):
+                fract_mixing, b_parent1, b_parent2 = self.get_mixing_parameters(idx_injection)
+                # print(f"fract_mixing: {fract_mixing} idx_injection {idx_injection}")
+                list_latents = self.compute_latents_mix(fract_mixing, b_parent1, b_parent2, idx_injection)
+                self.insert_into_tree(fract_mixing, idx_injection, list_latents)
+            
+        return self.tree_final_imgs
+                
+
+
+    def get_mixing_parameters(self, idx_injection):
+        # get_lpips_similarity
+        similarities = []
+        for i in range(len(self.tree_final_imgs)-1):
+            similarities.append(self.get_lpips_similarity(self.tree_final_imgs[i], self.tree_final_imgs[i+1]))
+        b_closest1 = np.argmax(similarities)
+        b_closest2 = b_closest1+1
+        fract_closest1 = self.tree_fracts[b_closest1]
+        fract_closest2 = self.tree_fracts[b_closest2]
+        
+        # Ensure that the parents are indeed older!
+        b_parent1 = b_closest1
+        while True:
+            if self.tree_idx_injection[b_parent1] < idx_injection:
+                break
+            else:
+                b_parent1 -= 1
+            
+        b_parent2 = b_closest2
+        while True:
+            if self.tree_idx_injection[b_parent2] < idx_injection:
+                break
+            else:
+                b_parent2 += 1
+                
+        # print(f"\n\nb_closest: {b_closest1} {b_closest2} fract_closest1 {fract_closest1} fract_closest2 {fract_closest2}")
+        # print(f"b_parent: {b_parent1} {b_parent2}")
+        # print(f"similarities {similarities}")
+        # print(f"idx_injection {idx_injection} tree_idx_injection {self.tree_idx_injection}")
+        
+        fract_mixing = (fract_closest1 + fract_closest2) /2 
+        return fract_mixing, b_parent1, b_parent2
+        
+     
+    def insert_into_tree(self, fract_mixing, idx_injection, list_latents):
+        # FIXME
+        b_parent1, b_parent2 = get_closest_idx(fract_mixing, self.tree_fracts)
+        self.tree_latents.insert(b_parent1+1, list_latents)
+        self.tree_final_imgs.insert(b_parent1+1, self.sdh.latent2image(list_latents[-1]))
+        self.tree_fracts.insert(b_parent1+1, fract_mixing)
+        self.tree_idx_injection.insert(b_parent1+1, idx_injection)
+        
+        
+    def compute_latents_mix(self, fract_mixing, b_parent1, b_parent2, idx_injection):    
+        # FIXME
+        list_conditionings = self.get_mixed_conditioning(fract_mixing)
+        fract_mixing_parental = (fract_mixing - self.tree_fracts[b_parent1]) / (self.tree_fracts[b_parent2] - self.tree_fracts[b_parent1]) 
+        idx_reversed = self.num_inference_steps - idx_injection
+        latents_for_injection = interpolate_spherical(
+            self.tree_latents[b_parent1][-idx_reversed-1], 
+            self.tree_latents[b_parent2][-idx_reversed-1], 
+            fract_mixing_parental)
+        list_latents = self.run_diffusion(list_conditionings, latents_for_injection=latents_for_injection, idx_start=idx_injection)
+        return list_latents
+            
+        
+    def compute_latents1(self, return_image=False):
+        print("starting compute_latents1")
+        list_conditionings = [self.text_embedding1]
+        t0 = time.time()
+        list_latents1 = self.run_diffusion(list_conditionings, seed_source=self.seed1)
+        t1 = time.time()
+        self.dt_per_diff = (t1-t0) / self.num_inference_steps
+        self.tree_latents[0] = list_latents1
+        if return_image:
+            return self.sdh.latent2image(list_latents1[-1])
+        else:
+            return list_latents1
+    
+        
+    def compute_latents2(self, return_image=False):
+        print("starting compute_latents2")
+        list_conditionings = [self.text_embedding2
+                              ]
+        # Influence from branch1
+        if self.branch1_influence > 0.0:
+            self.branch1_influence = np.clip(self.branch1_influence, 0, 1)
+            self.branch1_mixing_depth = np.clip(self.branch1_mixing_depth, 0, 1)
+            idx_crossfeed = int(round(self.num_inference_steps*self.branch1_mixing_depth))
+            list_latents2 = self.run_diffusion(
+                list_conditionings, 
+                idx_start=idx_crossfeed,
+                latents_for_injection=self.tree_latents[0],
+                seed_source=self.seed2,
+                seed_mixing_target=self.seed1,
+                mixing_coeff=self.branch1_influence)
+        else:
+            list_latents2 = self.run_diffusion(list_conditionings)
+        self.tree_latents[-1] = list_latents2
+        
+        if return_image:
+            return self.sdh.latent2image(list_latents2[-1])
+        else:
+            return list_latents2
+        
+    
+    
+    def run_transition_OLD(
             self, 
             recycle_img1: Optional[bool] = False, 
             recycle_img2: Optional[bool] = False, 
@@ -423,9 +610,9 @@ class LatentBlending():
         if self.branch1_influence > 0.0 and not self.branch1_insertion_completed:
             assert self.list_nmb_branches[0]==2, 'branch1 influnce currently requires the self.list_nmb_branches[0] = 0'
             self.branch1_influence = np.clip(self.branch1_influence, 0, 1)
-            self.branch1_fract_crossfeed = np.clip(self.branch1_fract_crossfeed, 0, 1)
+            self.branch1_mixing_depth = np.clip(self.branch1_mixing_depth, 0, 1)
             self.list_nmb_branches.insert(1, 2)
-            idx_crossfeed = int(round(self.list_injection_idx[1]*self.branch1_fract_crossfeed))
+            idx_crossfeed = int(round(self.list_injection_idx[1]*self.branch1_mixing_depth))
             self.list_injection_idx_ext.insert(1, idx_crossfeed)
             self.tree_fracts.insert(1, self.tree_fracts[0])
             self.tree_status.insert(1, self.tree_status[0])
@@ -606,6 +793,9 @@ class LatentBlending():
             latents_for_injection: torch.FloatTensor = None, 
             idx_start: int = -1, 
             idx_stop: int = -1, 
+            seed_source: int = -1,
+            seed_mixing_target: int = -1,
+            mixing_coeff: float = 0.0,
             return_image: Optional[bool] = False
         ):
         r"""
@@ -620,6 +810,7 @@ class LatentBlending():
                 Index of the diffusion process start and where the latents_for_injection are injected
             idx_stop: int
                 Index of the diffusion process end.
+            FIXME ARGS
             return_image: Optional[bool]
                 Optionally return image directly
         """
@@ -630,14 +821,23 @@ class LatentBlending():
         
         if self.mode == 'standard':
             text_embeddings = list_conditionings[0]
-            return self.sdh.run_diffusion_standard(text_embeddings, latents_for_injection=latents_for_injection, idx_start=idx_start, idx_stop=idx_stop, return_image=return_image)
+            return self.sdh.run_diffusion_standard(
+                text_embeddings, 
+                latents_for_injection=latents_for_injection, 
+                idx_start=idx_start, 
+                idx_stop=idx_stop,
+                seed_source=seed_source,
+                seed_mixing_target=seed_mixing_target,
+                mixing_coeff=mixing_coeff,
+                return_image=return_image,
+                )
         
         elif self.mode == 'inpaint':
             text_embeddings = list_conditionings[0]
             assert self.sdh.image_source is not None, "image_source is None. Please run init_inpainting first."
             assert self.sdh.mask_image is not None, "image_source is None. Please run init_inpainting first."
             return self.sdh.run_diffusion_inpaint(text_embeddings, latents_for_injection=latents_for_injection, idx_start=idx_start, idx_stop=idx_stop, return_image=return_image)
-
+        # FIXME LONG LINE
         elif self.mode == 'upscale':
             cond = list_conditionings[0]
             uc_full = list_conditionings[1]
@@ -882,8 +1082,6 @@ class LatentBlending():
                 self.tree_latents[t_block][-1] = list_latents[self.list_injection_idx_ext[t_block]:self.list_injection_idx_ext[t_block+1]]
         
 
-        
-
     def swap_forward(self):
         r"""
         Moves over keyframe two -> keyframe one. Useful for making a sequence of transitions
@@ -901,6 +1099,21 @@ class LatentBlending():
         self.tree_final_imgs = [] 
         
         
+    def get_lpips_similarity(self, imgA, imgB):
+        # FIXME
+        tensorA = torch.from_numpy(imgA).float().cuda(self.device)
+        tensorA = 2*tensorA/255.0 - 1
+        tensorA = tensorA.permute([2,0,1]).unsqueeze(0)
+        
+        tensorB = torch.from_numpy(imgB).float().cuda(self.device)
+        tensorB = 2*tensorB/255.0 - 1
+        tensorB = tensorB.permute([2,0,1]).unsqueeze(0)
+        lploss = self.lpips(tensorA, tensorB)
+        lploss = float(lploss[0][0][0][0])
+        
+        return lploss
+        
+        
 # Auxiliary functions
 def get_closest_idx(
         fract_mixing: float, 
@@ -1169,31 +1382,79 @@ if __name__ == "__main__":
     #%% First let us spawn a stable diffusion holder
     device = "cuda" 
     fp_ckpt = "../stable_diffusion_models/ckpt/v2-1_512-ema-pruned.ckpt" 
-    fp_config = 'configs/v2-inference.yaml'
     
-    sdh = StableDiffusionHolder(fp_ckpt, fp_config, device)
+    sdh = StableDiffusionHolder(fp_ckpt)
     
     xxx
     
         
     #%% Next let's set up all parameters
-    quality = 'medium'
+    depth_strength = 0.3 # Specifies how deep (in terms of diffusion iterations the first branching happens)
-    depth_strength = 0.65 # Specifies how deep (in terms of diffusion iterations the first branching happens)
+    fixed_seeds = [697164, 430214]
-    fixed_seeds = [69731932, 504430820]
         
-    prompt1 = "photo of a beautiful cherry forest covered in white flowers, ambient light, very detailed, magic"
+    prompt1 = "photo of a desert and a sky"
-    prompt2 = "photo of an golden statue with a funny hat, surrounded by ferns and vines, grainy analog photograph, mystical ambience, incredible detail"
+    prompt2 = "photo of a tree with a lake"
     
     duration_transition = 12 # In seconds
     fps = 30
     
     # Spawn latent blending
     self = LatentBlending(sdh)
-    self.branch1_influence = 0.8
+    
-    self.load_branching_profile(quality=quality, depth_strength=0.3)
     self.set_prompt1(prompt1)
     self.set_prompt2(prompt2)
     
     # Run latent blending
-    imgs_transition = self.run_transition(fixed_seeds=fixed_seeds)
+    self.branch1_influence = 0.3
+    self.branch1_mixing_depth = 0.4
+    self.run_transition(depth_strength=depth_strength, fixed_seeds=fixed_seeds)
+    #%%
+    self.branch1_influence = 0.3
+    self.branch1_mixing_depth = 0.5
+    img2 = self.compute_latents2(return_image=True)
+    Image.fromarray(img2)
     
+    #%%
+    idx_injection = 15
+    fract_mixing = 0.5
+    list_conditionings = self.get_mixed_conditioning(fract_mixing)
+    latents_for_injection = interpolate_spherical(self.tree_latents[0][idx_injection], self.tree_latents[-1][idx_injection], fract_mixing)
+    list_latents = self.run_diffusion(list_conditionings, latents_for_injection=latents_for_injection, idx_start=idx_injection)
+    img_mix = self.sdh.latent2image((list_latents[-1]))
+    
+    Image.fromarray(np.concatenate((img1,img_mix,img2), axis=1)).resize((800,800//3))
+    
+    #%% scheme
+    # init scheme
+    list_idx_injection = np.arange(idx_injection_base, self.num_inference_steps-1, 2)
+    list_nmb_stems = np.ones(len(list_idx_injection), dtype=np.int32)
+    
+    #%% 
+    list_compute_steps = self.num_inference_steps - list_idx_injection
+    list_compute_steps *= list_nmb_stems
+    t_compute = np.sum(list_compute_steps) * self.dt_per_diff
+    increase_done = False
+    for s_idx in range(len(list_nmb_stems)-1):
+        if list_nmb_stems[s_idx+1] / list_nmb_stems[s_idx] >= 3:
+            list_nmb_stems[s_idx] += 1
+            increase_done = True
+            break
+    if not increase_done:
+        list_nmb_stems[-1] += 1
+    print(f"t_compute {t_compute} list_nmb_stems {list_nmb_stems}")
+    
+    
+    #%%
+    
+    imgs_transition = self.tree_final_imgs
+    # Let's get more cheap frames via linear interpolation (duration_transition*fps frames)
+    imgs_transition_ext = add_frames_linear_interp(imgs_transition, 15, fps)
+    
+    # Save as MP4
+    fp_movie = "test.mp4"
+    if os.path.isfile(fp_movie):
+        os.remove(fp_movie)
+    ms = MovieSaver(fp_movie, fps=fps, shape_hw=[sdh.height, sdh.width])
+    for img in tqdm(imgs_transition_ext):
+        ms.write_frame(img)
+    ms.finalize()

stable_diffusion_holder.py

@@ -42,7 +42,6 @@ from contextlib import nullcontext
 from ldm.util import instantiate_from_config
 from ldm.models.diffusion.ddim import DDIMSampler
 from einops import repeat, rearrange
-
 #%%
 
 
@@ -279,10 +278,13 @@ class StableDiffusionHolder:
     def run_diffusion_standard(
             self, 
             text_embeddings: torch.FloatTensor, 
-            latents_for_injection: torch.FloatTensor = None, 
+            latents_for_injection = None, 
             idx_start: int = -1, 
             idx_stop: int = -1, 
-            return_image: Optional[bool] = False
+            seed_source: int = -1,
+            seed_mixing_target: int = -1,
+            mixing_coeff: float = 0.0,
+            return_image: Optional[bool] = False,
         ):
         r"""
         Wrapper function for run_diffusion_standard and run_diffusion_inpaint.
@@ -291,12 +293,18 @@ class StableDiffusionHolder:
         Args:
             text_embeddings: torch.FloatTensor 
                 Text embeddings used for diffusion
-            latents_for_injection: torch.FloatTensor 
+            latents_for_injection: torch.FloatTensor or list
                 Latents that are used for injection
             idx_start: int
                 Index of the diffusion process start and where the latents_for_injection are injected
             idx_stop: int
                 Index of the diffusion process end.
+            mixing_coeff:
+                # FIXME
+            seed_source:
+                # FIXME
+            seed_mixing:
+                # FIXME
             return_image: Optional[bool]
                 Optionally return image directly
         """
@@ -304,12 +312,19 @@ class StableDiffusionHolder:
         
         if latents_for_injection is None:
             do_inject_latents = False
+            do_mix_latents = False
+        else:
+            if mixing_coeff > 0.0:
+                do_inject_latents = False
+                do_mix_latents = True
+                assert seed_mixing_target != -1, "Set to correct seed for mixing"
             else:
                 do_inject_latents = True    
+                do_mix_latents = False
         
         
         precision_scope = autocast if self.precision == "autocast" else nullcontext
-        generator = torch.Generator(device=self.device).manual_seed(int(self.seed))
+        generator = torch.Generator(device=self.device).manual_seed(int(seed_source))
         
         with precision_scope("cuda"):
             with self.model.ema_scope():
@@ -340,6 +355,16 @@ class StableDiffusionHolder:
                             continue
                         elif i == idx_start:
                             latents = latents_for_injection.clone()
+                    if do_mix_latents:
+                        if i == 0:
+                            generator = torch.Generator(device=self.device).manual_seed(int(seed_mixing_target))
+                            latents_mixtarget = torch.randn(size, generator=generator, device=self.device)
+                        if i < idx_start:
+                            latents_mixtarget = latents_for_injection[i-1].clone()
+                        latents = interpolate_spherical(latents, latents_mixtarget, mixing_coeff)
+                        
+                        if i == idx_start:
+                            do_mix_latents = False
                     
                     if i == idx_stop:
                         return list_latents_out
@@ -576,6 +601,50 @@ class StableDiffusionHolder:
         image = x_sample.astype(np.uint8)
         return image
 
+@torch.no_grad()
+def interpolate_spherical(p0, p1, fract_mixing: float):
+    r"""
+    Helper function to correctly mix two random variables using spherical interpolation.
+    See https://en.wikipedia.org/wiki/Slerp
+    The function will always cast up to float64 for sake of extra 4.
+    Args:
+        p0: 
+            First tensor for interpolation
+        p1: 
+            Second tensor for interpolation
+        fract_mixing: float 
+            Mixing coefficient of interval [0, 1]. 
+            0 will return in p0
+            1 will return in p1
+            0.x will return a mix between both preserving angular velocity.
+    """ 
+    
+    if p0.dtype == torch.float16:
+        recast_to = 'fp16'
+    else:
+        recast_to = 'fp32'
+    
+    p0 = p0.double()
+    p1 = p1.double()
+    norm = torch.linalg.norm(p0) * torch.linalg.norm(p1)
+    epsilon = 1e-7
+    dot = torch.sum(p0 * p1) / norm
+    dot = dot.clamp(-1+epsilon, 1-epsilon)
+    
+    theta_0 = torch.arccos(dot)
+    sin_theta_0 = torch.sin(theta_0)
+    theta_t = theta_0 * fract_mixing
+    s0 = torch.sin(theta_0 - theta_t) / sin_theta_0
+    s1 = torch.sin(theta_t) / sin_theta_0
+    interp = p0*s0 + p1*s1
+    
+    if recast_to == 'fp16':
+        interp = interp.half()
+    elif recast_to == 'fp32':
+        interp = interp.float()
+        
+    return interp
+
 
 if __name__ == "__main__":