Merge branch 'master' into master

README.md

@@ -133,3 +133,16 @@ the same effect. Use the --no-progressbar-hiding commandline option to revert th
 ### Prompt validation
 Stable Diffusion has a limit for input text length. If your prompt is too long, you will get a
 warning in the text output field, showing which parts of your text were truncated and ignored by the model.
+
+### Loopback
+A checkbox for img2img allowing to automatically feed output image as input for the next batch. Equivalent to
+saving output image, and replacing input image with it. Batch count setting controls how many iterations of
+this you get.
+
+Usually, when doing this, you would choose one of many images for the next iteration yourself, so the usefulness
+of this feature may be questionable, but I've managed to get some very nice outputs with it that I wasn't abble
+to get otherwise.
+
+Example: (cherrypicked result; original picture by anon)
+
+![](images/loopback.jpg)

webui.py

@@ -49,6 +49,8 @@ parser.add_argument("--gfpgan-dir", type=str, help="GFPGAN directory", default=(
 parser.add_argument("--no-verify-input", action='store_true', help="do not verify input to check if it's too long")
 parser.add_argument("--no-half", action='store_true', help="do not switch the model to 16-bit floats")
 parser.add_argument("--no-progressbar-hiding", action='store_true', help="do not hide progressbar in gradio UI (we hide it because it slows down ML if you have hardware accleration in browser)")
+parser.add_argument("--max-batch-count",  type=int, default=16, help="maximum batch count value for the UI")
+parser.add_argument("--grid-format",  type=str, default='png', help="file format for saved grids; can be png or jpg")
 opt = parser.parse_args()
 
 GFPGAN_dir = opt.gfpgan_dir
@@ -159,8 +161,10 @@ device = torch.device("cuda") if torch.cuda.is_available() else torch.device("cp
 model = (model if opt.no_half else model.half()).to(device)
 
 
-def image_grid(imgs, batch_size, round_down=False):
-    if opt.n_rows > 0:
+def image_grid(imgs, batch_size, round_down=False, force_n_rows=None):
+    if force_n_rows is not None:
+        rows = force_n_rows
+    elif opt.n_rows > 0:
         rows = opt.n_rows
     elif opt.n_rows == 0:
         rows = batch_size
@@ -299,7 +303,7 @@ def check_prompt_length(prompt, comments):
     comments.append(f"Warning: too many input tokens; some ({len(overflowing_words)}) have been truncated:\n{overflowing_text}\n")
 
 
-def process_images(outpath, func_init, func_sample, prompt, seed, sampler_name, batch_size, n_iter, steps, cfg_scale, width, height, prompt_matrix, use_GFPGAN):
+def process_images(outpath, func_init, func_sample, prompt, seed, sampler_name, batch_size, n_iter, steps, cfg_scale, width, height, prompt_matrix, use_GFPGAN, do_not_save_grid=False):
     """this is the main loop that both txt2img and img2img use; it calls func_init once inside all the scopes and func_sample once per batch"""
 
     assert prompt is not None
@@ -390,7 +394,7 @@ def process_images(outpath, func_init, func_sample, prompt, seed, sampler_name,
                     output_images.append(image)
                     base_count += 1
 
-        if prompt_matrix or not opt.skip_grid:
+        if (prompt_matrix or not opt.skip_grid) and not do_not_save_grid:
             grid = image_grid(output_images, batch_size, round_down=prompt_matrix)
 
             if prompt_matrix:
@@ -404,8 +408,8 @@ def process_images(outpath, func_init, func_sample, prompt, seed, sampler_name,
 
                 output_images.insert(0, grid)
 
-            grid_file = f"grid-{grid_count:05}-{seed}_{prompts[i].replace(' ', '_').translate({ord(x): '' for x in invalid_filename_chars})[:128]}.jpg"
-            grid.save(os.path.join(outpath, grid_file), 'jpeg', quality=80, optimize=True)
+
+            grid.save(os.path.join(outpath, f'grid-{grid_count:04}.{opt.grid_format}'))
             grid_count += 1
 
     info = f"""
@@ -510,7 +514,7 @@ txt2img_interface = gr.Interface(
         gr.Checkbox(label='Fix faces using GFPGAN', value=False, visible=GFPGAN is not None),
         gr.Checkbox(label='Create prompt matrix (separate multiple prompts using |, and get all combinations of them)', value=False),
         gr.Slider(minimum=0.0, maximum=1.0, step=0.01, label="DDIM ETA", value=0.0, visible=False),
-        gr.Slider(minimum=1, maximum=16, step=1, label='Batch count (how many batches of images to generate)', value=1),
+        gr.Slider(minimum=1, maximum=opt.max_batch_count, step=1, label='Batch count (how many batches of images to generate)', value=1),
         gr.Slider(minimum=1, maximum=8, step=1, label='Batch size (how many images are in a batch; memory-hungry)', value=1),
         gr.Slider(minimum=1.0, maximum=15.0, step=0.5, label='Classifier Free Guidance Scale (how strongly the image should follow the prompt)', value=7.0),
         gr.Number(label='Seed', value=-1),
@@ -528,13 +532,12 @@ txt2img_interface = gr.Interface(
 )
 
 
-def img2img(prompt: str, init_img, ddim_steps: int, use_GFPGAN: bool, prompt_matrix, n_iter: int, batch_size: int, cfg_scale: float, denoising_strength: float, seed: int, height: int, width: int, resize_mode: int):
+def img2img(prompt: str, init_img, ddim_steps: int, use_GFPGAN: bool, prompt_matrix, loopback: bool, n_iter: int, batch_size: int, cfg_scale: float, denoising_strength: float, seed: int, height: int, width: int, resize_mode: int):
     outpath = opt.outdir or "outputs/img2img-samples"
 
     sampler = KDiffusionSampler(model)
 
     assert 0. <= denoising_strength <= 1., 'can only work with strength in [0.0, 1.0]'
-    t_enc = int(denoising_strength * ddim_steps)
 
     def init():
         image = init_img.convert("RGB")
@@ -551,6 +554,8 @@ def img2img(prompt: str, init_img, ddim_steps: int, use_GFPGAN: bool, prompt_mat
         return init_latent,
 
     def sample(init_data, x, conditioning, unconditional_conditioning):
+        t_enc = int(denoising_strength * ddim_steps)
+
         x0, = init_data
 
         sigmas = sampler.model_wrap.get_sigmas(ddim_steps)
@@ -562,22 +567,62 @@ def img2img(prompt: str, init_img, ddim_steps: int, use_GFPGAN: bool, prompt_mat
         samples_ddim = K.sampling.sample_lms(model_wrap_cfg, xi, sigma_sched, extra_args={'cond': conditioning, 'uncond': unconditional_conditioning, 'cond_scale': cfg_scale}, disable=False)
         return samples_ddim
 
-    output_images, seed, info = process_images(
-        outpath=outpath,
-        func_init=init,
-        func_sample=sample,
-        prompt=prompt,
-        seed=seed,
-        sampler_name='k-diffusion',
-        batch_size=batch_size,
-        n_iter=n_iter,
-        steps=ddim_steps,
-        cfg_scale=cfg_scale,
-        width=width,
-        height=height,
-        prompt_matrix=prompt_matrix,
-        use_GFPGAN=use_GFPGAN
-    )
+    if loopback:
+        output_images, info = None, None
+        history = []
+        initial_seed = None
+
+        for i in range(n_iter):
+            output_images, seed, info = process_images(
+                outpath=outpath,
+                func_init=init,
+                func_sample=sample,
+                prompt=prompt,
+                seed=seed,
+                sampler_name='k-diffusion',
+                batch_size=1,
+                n_iter=1,
+                steps=ddim_steps,
+                cfg_scale=cfg_scale,
+                width=width,
+                height=height,
+                prompt_matrix=prompt_matrix,
+                use_GFPGAN=use_GFPGAN,
+                do_not_save_grid=True
+            )
+
+            if initial_seed is None:
+                initial_seed = seed
+
+            init_img = output_images[0]
+            seed = seed + 1
+            denoising_strength = max(denoising_strength * 0.95, 0.1)
+            history.append(init_img)
+
+        grid_count = len(os.listdir(outpath)) - 1
+        grid = image_grid(history, batch_size, force_n_rows=1)
+        grid.save(os.path.join(outpath, f'grid-{grid_count:04}.{opt.grid_format}'))
+
+        output_images = history
+        seed = initial_seed
+
+    else:
+        output_images, seed, info = process_images(
+            outpath=outpath,
+            func_init=init,
+            func_sample=sample,
+            prompt=prompt,
+            seed=seed,
+            sampler_name='k-diffusion',
+            batch_size=batch_size,
+            n_iter=n_iter,
+            steps=ddim_steps,
+            cfg_scale=cfg_scale,
+            width=width,
+            height=height,
+            prompt_matrix=prompt_matrix,
+            use_GFPGAN=use_GFPGAN
+        )
 
     del sampler
 
@@ -595,7 +640,8 @@ img2img_interface = gr.Interface(
         gr.Slider(minimum=1, maximum=150, step=1, label="Sampling Steps", value=50),
         gr.Checkbox(label='Fix faces using GFPGAN', value=False, visible=GFPGAN is not None),
         gr.Checkbox(label='Create prompt matrix (separate multiple prompts using |, and get all combinations of them)', value=False),
-        gr.Slider(minimum=1, maximum=16, step=1, label='Batch count (how many batches of images to generate)', value=1),
+        gr.Checkbox(label='Loopback (use images from previous batch when creating next batch)', value=False),
+        gr.Slider(minimum=1, maximum=opt.max_batch_count, step=1, label='Batch count (how many batches of images to generate)', value=1),
         gr.Slider(minimum=1, maximum=8, step=1, label='Batch size (how many images are in a batch; memory-hungry)', value=1),
         gr.Slider(minimum=1.0, maximum=15.0, step=0.5, label='Classifier Free Guidance Scale (how strongly the image should follow the prompt)', value=7.0),
         gr.Slider(minimum=0.0, maximum=1.0, step=0.01, label='Denoising Strength', value=0.75),