feature: xformers support

add more upscaling code (that doesn't yet work)

README.md

@@ -231,6 +231,8 @@ docker run -it --gpus all -v $HOME/.cache/huggingface:/root/.cache/huggingface -
 
 ## ChangeLog
 
+- feature: xformers support
+
 **6.1.0**
 - feature: use different default steps and image sizes depending on sampler and model selceted
 - fix: #110 use proper version in image metadata

imaginairy/config.py

@@ -49,6 +49,12 @@ MODEL_CONFIGS = [
         weights_url="https://huggingface.co/stabilityai/stable-diffusion-2/resolve/main/768-v-ema.ckpt",
         default_image_size=768,
     ),
+    ModelConfig(
+        short_name="SD-2.0-upscale",
+        config_path="configs/stable-diffusion-v2-upscaling.yaml",
+        weights_url="https://huggingface.co/stabilityai/stable-diffusion-x4-upscaler/resolve/main/x4-upscaler-ema.ckpt",
+        default_image_size=512,
+    ),
 ]
 
 MODEL_CONFIG_SHORTCUTS = {m.short_name: m for m in MODEL_CONFIGS}

imaginairy/configs/stable-diffusion-x4-upscaling.yaml

@@ -1,6 +1,6 @@
 model:
   base_learning_rate: 1.0e-04
-  target: ldm.models.diffusion.ddpm.LatentUpscaleDiffusion
+  target: imaginairy.modules.diffusion.ddpm.LatentUpscaleDiffusion
   params:
     parameterization: "v"
     low_scale_key: "lr"

imaginairy/modules/attention.py

@@ -171,7 +171,8 @@ class CrossAttention(nn.Module):
         #     mask = _global_mask_hack.to(torch.bool)
 
         if get_device() == "cuda" or "mps" in get_device():
-            return self.forward_splitmem(x, context=context, mask=mask)
+            if not XFORMERS_IS_AVAILBLE:
+                return self.forward_splitmem(x, context=context, mask=mask)
 
         h = self.heads
 

imaginairy/modules/diffusion/ddpm.py

@@ -7,7 +7,7 @@ https://github.com/CompVis/taming-transformers
 """
 import itertools
 import logging
-from contextlib import contextmanager
+from contextlib import contextmanager, nullcontext
 from functools import partial
 
 import numpy as np
@@ -39,6 +39,18 @@ def disabled_train(self):
     return self
 
 
+def ismap(x):
+    if not isinstance(x, torch.Tensor):
+        return False
+    return (len(x.shape) == 4) and (x.shape[1] > 3)
+
+
+def isimage(x):
+    if not isinstance(x, torch.Tensor):
+        return False
+    return (len(x.shape) == 4) and (x.shape[1] == 3 or x.shape[1] == 1)
+
+
 def uniform_on_device(r1, r2, shape, device):
     return (r1 - r2) * torch.rand(*shape, device=device) + r2
 
@@ -1324,6 +1336,188 @@ class DiffusionWrapper(pl.LightningModule):
         return out
 
 
+class LatentFinetuneDiffusion(LatentDiffusion):
+    """
+    Basis for different finetunas, such as inpainting or depth2image
+    To disable finetuning mode, set finetune_keys to None
+    """
+
+    def __init__(
+        self,
+        concat_keys: tuple,
+        finetune_keys=(
+            "model.diffusion_model.input_blocks.0.0.weight",
+            "model_ema.diffusion_modelinput_blocks00weight",
+        ),
+        keep_finetune_dims=4,
+        # if model was trained without concat mode before and we would like to keep these channels
+        c_concat_log_start=None,  # to log reconstruction of c_concat codes
+        c_concat_log_end=None,
+        **kwargs,
+    ):
+        ckpt_path = kwargs.pop("ckpt_path", None)
+        ignore_keys = kwargs.pop("ignore_keys", [])
+        super().__init__(**kwargs)
+        self.finetune_keys = finetune_keys
+        self.concat_keys = concat_keys
+        self.keep_dims = keep_finetune_dims
+        self.c_concat_log_start = c_concat_log_start
+        self.c_concat_log_end = c_concat_log_end
+        if self.finetune_keys is not None:
+            assert ckpt_path is not None, "can only finetune from a given checkpoint"
+        if ckpt_path is not None:
+            self.init_from_ckpt(ckpt_path, ignore_keys)
+
+    def init_from_ckpt(self, path, ignore_keys=tuple(), only_model=False):
+        sd = torch.load(path, map_location="cpu")
+        if "state_dict" in list(sd.keys()):
+            sd = sd["state_dict"]
+        keys = list(sd.keys())
+        for k in keys:
+            for ik in ignore_keys:
+                if k.startswith(ik):
+                    print("Deleting key {k} from state_dict.")
+                    del sd[k]
+
+            # make it explicit, finetune by including extra input channels
+            if self.finetune_keys is not None and k in self.finetune_keys:
+                new_entry = None
+                for name, param in self.named_parameters():
+                    if name in self.finetune_keys:
+                        print(
+                            f"modifying key '{name}' and keeping its original {self.keep_dims} (channels) dimensions only"
+                        )
+                        new_entry = torch.zeros_like(param)  # zero init
+                assert (
+                    new_entry is not None
+                ), "did not find matching parameter to modify"
+                new_entry[:, : self.keep_dims, ...] = sd[k]
+                sd[k] = new_entry
+
+        missing, unexpected = (
+            self.load_state_dict(sd, strict=False)
+            if not only_model
+            else self.model.load_state_dict(sd, strict=False)
+        )
+        print(
+            f"Restored from {path} with {len(missing)} missing and {len(unexpected)} unexpected keys"
+        )
+        if len(missing) > 0:
+            print(f"Missing Keys: {missing}")
+        if len(unexpected) > 0:
+            print(f"Unexpected Keys: {unexpected}")
+
+    @torch.no_grad()
+    def log_images(  # noqa
+        self,
+        batch,
+        N=8,
+        n_row=4,
+        sample=True,
+        ddim_steps=200,
+        ddim_eta=1.0,
+        return_keys=None,
+        quantize_denoised=True,
+        inpaint=True,
+        plot_denoise_rows=False,
+        plot_progressive_rows=True,
+        plot_diffusion_rows=True,
+        unconditional_guidance_scale=1.0,
+        unconditional_guidance_label=None,
+        use_ema_scope=True,
+        **kwargs,
+    ):
+        ema_scope = self.ema_scope if use_ema_scope else nullcontext
+        use_ddim = ddim_steps is not None
+
+        log = {}
+        z, c, x, xrec, xc = self.get_input(
+            batch, self.first_stage_key, bs=N, return_first_stage_outputs=True
+        )
+        c_cat, c = c["c_concat"][0], c["c_crossattn"][0]
+        N = min(x.shape[0], N)
+        n_row = min(x.shape[0], n_row)
+        log["inputs"] = x
+        log["reconstruction"] = xrec
+        if self.model.conditioning_key is not None:
+            if hasattr(self.cond_stage_model, "decode"):
+                xc = self.cond_stage_model.decode(c)
+                log["conditioning"] = xc
+            elif self.cond_stage_key in ["caption", "txt"]:
+                # xc = log_txt_as_img((x.shape[2], x.shape[3]), batch[self.cond_stage_key], size=x.shape[2] // 25)
+                log["conditioning"] = xc
+            elif self.cond_stage_key in ["class_label", "cls"]:
+                # xc = log_txt_as_img((x.shape[2], x.shape[3]), batch["human_label"], size=x.shape[2] // 25)
+                log["conditioning"] = xc
+            elif isimage(xc):
+                log["conditioning"] = xc
+            if ismap(xc):
+                log["original_conditioning"] = self.to_rgb(xc)
+
+        if not (self.c_concat_log_start is None and self.c_concat_log_end is None):
+            log["c_concat_decoded"] = self.decode_first_stage(
+                c_cat[:, self.c_concat_log_start : self.c_concat_log_end]  # noqa
+            )
+
+        if plot_diffusion_rows:
+            # get diffusion row
+            diffusion_row = []
+            z_start = z[:n_row]
+            for t in range(self.num_timesteps):
+                if t % self.log_every_t == 0 or t == self.num_timesteps - 1:
+                    t = repeat(torch.tensor([t]), "1 -> b", b=n_row)
+                    t = t.to(self.device).long()
+                    noise = torch.randn_like(z_start)
+                    z_noisy = self.q_sample(x_start=z_start, t=t, noise=noise)
+                    diffusion_row.append(self.decode_first_stage(z_noisy))
+
+            diffusion_row = torch.stack(diffusion_row)  # n_log_step, n_row, C, H, W
+            diffusion_grid = rearrange(diffusion_row, "n b c h w -> b n c h w")
+            diffusion_grid = rearrange(diffusion_grid, "b n c h w -> (b n) c h w")
+            diffusion_grid = make_grid(diffusion_grid, nrow=diffusion_row.shape[0])
+            log["diffusion_row"] = diffusion_grid
+
+        if sample:
+            # get denoise row
+            with ema_scope("Sampling"):
+                samples, z_denoise_row = self.sample_log(
+                    cond={"c_concat": [c_cat], "c_crossattn": [c]},
+                    batch_size=N,
+                    ddim=use_ddim,
+                    ddim_steps=ddim_steps,
+                    eta=ddim_eta,
+                )
+                # samples, z_denoise_row = self.sample(cond=c, batch_size=N, return_intermediates=True)
+            x_samples = self.decode_first_stage(samples)
+            log["samples"] = x_samples
+            if plot_denoise_rows:
+                denoise_grid = self._get_denoise_row_from_list(z_denoise_row)
+                log["denoise_row"] = denoise_grid
+
+        if unconditional_guidance_scale > 1.0:
+            uc_cross = self.get_unconditional_conditioning(
+                N, unconditional_guidance_label
+            )
+            uc_cat = c_cat
+            uc_full = {"c_concat": [uc_cat], "c_crossattn": [uc_cross]}
+            with ema_scope("Sampling with classifier-free guidance"):
+                samples_cfg, _ = self.sample_log(
+                    cond={"c_concat": [c_cat], "c_crossattn": [c]},
+                    batch_size=N,
+                    ddim=use_ddim,
+                    ddim_steps=ddim_steps,
+                    eta=ddim_eta,
+                    unconditional_guidance_scale=unconditional_guidance_scale,
+                    unconditional_conditioning=uc_full,
+                )
+                x_samples_cfg = self.decode_first_stage(samples_cfg)
+                log[
+                    f"samples_cfg_scale_{unconditional_guidance_scale:.2f}"
+                ] = x_samples_cfg
+
+        return log
+
+
 class LatentInpaintDiffusion(LatentDiffusion):
     def __init__(  # noqa
         self,
@@ -1377,3 +1571,152 @@ class LatentInpaintDiffusion(LatentDiffusion):
         if return_first_stage_outputs:
             return z, all_conds, x, xrec, xc
         return z, all_conds
+
+
+class LatentDepth2ImageDiffusion(LatentFinetuneDiffusion):
+    """
+    condition on monocular depth estimation
+    """
+
+    def __init__(self, depth_stage_config, concat_keys=("midas_in",), **kwargs):
+        super().__init__(concat_keys=concat_keys, **kwargs)
+        self.depth_model = instantiate_from_config(depth_stage_config)
+        self.depth_stage_key = concat_keys[0]
+
+    @torch.no_grad()
+    def get_input(
+        self, batch, k, cond_key=None, bs=None, return_first_stage_outputs=False
+    ):
+        # note: restricted to non-trainable encoders currently
+        assert (
+            not self.cond_stage_trainable
+        ), "trainable cond stages not yet supported for depth2img"
+        z, c, x, xrec, xc = super().get_input(
+            batch,
+            self.first_stage_key,
+            return_first_stage_outputs=True,
+            force_c_encode=True,
+            return_original_cond=True,
+            bs=bs,
+        )
+
+        assert self.concat_keys is not None
+        assert len(self.concat_keys) == 1
+        c_cat = []
+        for ck in self.concat_keys:
+            cc = batch[ck]
+            if bs is not None:
+                cc = cc[:bs]
+                cc = cc.to(self.device)
+            cc = self.depth_model(cc)
+            cc = torch.nn.functional.interpolate(
+                cc,
+                size=z.shape[2:],
+                mode="bicubic",
+                align_corners=False,
+            )
+
+            depth_min, depth_max = torch.amin(
+                cc, dim=[1, 2, 3], keepdim=True
+            ), torch.amax(cc, dim=[1, 2, 3], keepdim=True)
+            cc = 2.0 * (cc - depth_min) / (depth_max - depth_min + 0.001) - 1.0
+            c_cat.append(cc)
+        c_cat = torch.cat(c_cat, dim=1)
+        all_conds = {"c_concat": [c_cat], "c_crossattn": [c]}
+        if return_first_stage_outputs:
+            return z, all_conds, x, xrec, xc
+        return z, all_conds
+
+    @torch.no_grad()
+    def log_images(self, *args, **kwargs):
+        log = super().log_images(*args, **kwargs)
+        depth = self.depth_model(args[0][self.depth_stage_key])
+        depth_min, depth_max = torch.amin(
+            depth, dim=[1, 2, 3], keepdim=True
+        ), torch.amax(depth, dim=[1, 2, 3], keepdim=True)
+        log["depth"] = 2.0 * (depth - depth_min) / (depth_max - depth_min) - 1.0
+        return log
+
+
+class LatentUpscaleFinetuneDiffusion(LatentFinetuneDiffusion):
+    """
+    condition on low-res image (and optionally on some spatial noise augmentation)
+    """
+
+    def __init__(
+        self,
+        concat_keys=("lr",),
+        reshuffle_patch_size=None,
+        low_scale_config=None,
+        low_scale_key=None,
+        **kwargs,
+    ):
+        super().__init__(concat_keys=concat_keys, **kwargs)
+        self.reshuffle_patch_size = reshuffle_patch_size
+        self.low_scale_model = None
+        if low_scale_config is not None:
+            print("Initializing a low-scale model")
+            assert low_scale_key is not None
+            self.instantiate_low_stage(low_scale_config)
+            self.low_scale_key = low_scale_key
+
+    def instantiate_low_stage(self, config):
+        model = instantiate_from_config(config)
+        self.low_scale_model = model.eval()
+        self.low_scale_model.train = disabled_train
+        for param in self.low_scale_model.parameters():
+            param.requires_grad = False
+
+    @torch.no_grad()
+    def get_input(
+        self, batch, k, cond_key=None, bs=None, return_first_stage_outputs=False
+    ):
+        # note: restricted to non-trainable encoders currently
+        assert (
+            not self.cond_stage_trainable
+        ), "trainable cond stages not yet supported for upscaling-ft"
+        z, c, x, xrec, xc = super().get_input(
+            batch,
+            self.first_stage_key,
+            return_first_stage_outputs=True,
+            force_c_encode=True,
+            return_original_cond=True,
+            bs=bs,
+        )
+
+        assert self.concat_keys is not None
+        assert len(self.concat_keys) == 1
+        # optionally make spatial noise_level here
+        c_cat = []
+        noise_level = None
+        for ck in self.concat_keys:
+            cc = batch[ck]
+            cc = rearrange(cc, "b h w c -> b c h w")
+            if self.reshuffle_patch_size is not None:
+                assert isinstance(self.reshuffle_patch_size, int)
+                cc = rearrange(
+                    cc,
+                    "b c (p1 h) (p2 w) -> b (p1 p2 c) h w",
+                    p1=self.reshuffle_patch_size,
+                    p2=self.reshuffle_patch_size,
+                )
+            if bs is not None:
+                cc = cc[:bs]
+                cc = cc.to(self.device)
+            if self.low_scale_model is not None and ck == self.low_scale_key:
+                cc, noise_level = self.low_scale_model(cc)
+            c_cat.append(cc)
+        c_cat = torch.cat(c_cat, dim=1)
+        if noise_level is not None:
+            all_conds = {"c_concat": [c_cat], "c_crossattn": [c], "c_adm": noise_level}
+        else:
+            all_conds = {"c_concat": [c_cat], "c_crossattn": [c]}
+        if return_first_stage_outputs:
+            return z, all_conds, x, xrec, xc
+        return z, all_conds
+
+    @torch.no_grad()
+    def log_images(self, *args, **kwargs):
+        log = super().log_images(*args, **kwargs)
+        log["lr"] = rearrange(args[0]["lr"], "b h w c -> b c h w")
+        return log

imaginairy/modules/diffusion/upscaling.py

@@ -0,0 +1,105 @@
+from functools import partial
+
+import numpy as np
+import torch
+from torch import nn
+
+from imaginairy.modules.diffusion.util import extract_into_tensor, make_beta_schedule
+
+
+class AbstractLowScaleModel(nn.Module):
+    # for concatenating a downsampled image to the latent representation
+    def __init__(self, noise_schedule_config=None):
+        super().__init__()
+        if noise_schedule_config is not None:
+            self.register_schedule(**noise_schedule_config)
+
+    def register_schedule(
+        self,
+        beta_schedule="linear",
+        timesteps=1000,
+        linear_start=1e-4,
+        linear_end=2e-2,
+        cosine_s=8e-3,
+    ):
+        betas = make_beta_schedule(
+            beta_schedule,
+            timesteps,
+            linear_start=linear_start,
+            linear_end=linear_end,
+            cosine_s=cosine_s,
+        )
+        alphas = 1.0 - betas
+        alphas_cumprod = np.cumprod(alphas, axis=0)
+        alphas_cumprod_prev = np.append(1.0, alphas_cumprod[:-1])
+
+        (timesteps,) = betas.shape
+        self.num_timesteps = int(timesteps)
+        self.linear_start = linear_start
+        self.linear_end = linear_end
+        assert (
+            alphas_cumprod.shape[0] == self.num_timesteps
+        ), "alphas have to be defined for each timestep"
+
+        to_torch = partial(torch.tensor, dtype=torch.float32)
+
+        self.register_buffer("betas", to_torch(betas))
+        self.register_buffer("alphas_cumprod", to_torch(alphas_cumprod))
+        self.register_buffer("alphas_cumprod_prev", to_torch(alphas_cumprod_prev))
+
+        # calculations for diffusion q(x_t | x_{t-1}) and others
+        self.register_buffer("sqrt_alphas_cumprod", to_torch(np.sqrt(alphas_cumprod)))
+        self.register_buffer(
+            "sqrt_one_minus_alphas_cumprod", to_torch(np.sqrt(1.0 - alphas_cumprod))
+        )
+        self.register_buffer(
+            "log_one_minus_alphas_cumprod", to_torch(np.log(1.0 - alphas_cumprod))
+        )
+        self.register_buffer(
+            "sqrt_recip_alphas_cumprod", to_torch(np.sqrt(1.0 / alphas_cumprod))
+        )
+        self.register_buffer(
+            "sqrt_recipm1_alphas_cumprod", to_torch(np.sqrt(1.0 / alphas_cumprod - 1))
+        )
+
+    def q_sample(self, x_start, t, noise=None):
+        if noise is None:
+            noise = torch.randn_like(x_start)
+        return (
+            extract_into_tensor(self.sqrt_alphas_cumprod, t, x_start.shape) * x_start
+            + extract_into_tensor(self.sqrt_one_minus_alphas_cumprod, t, x_start.shape)
+            * noise
+        )
+
+    def forward(self, x):
+        return x, None
+
+    def decode(self, x):
+        return x
+
+
+class SimpleImageConcat(AbstractLowScaleModel):
+    # no noise level conditioning
+    def __init__(self):
+        super().__init__(noise_schedule_config=None)
+        self.max_noise_level = 0
+
+    def forward(self, x):
+        # fix to constant noise level
+        return x, torch.zeros(x.shape[0], device=x.device).long()
+
+
+class ImageConcatWithNoiseAugmentation(AbstractLowScaleModel):
+    def __init__(self, noise_schedule_config, max_noise_level=1000, to_cuda=False):
+        super().__init__(noise_schedule_config=noise_schedule_config)
+        self.max_noise_level = max_noise_level
+
+    def forward(self, x, noise_level=None):
+        if noise_level is None:
+            noise_level = torch.randint(
+                0, self.max_noise_level, (x.shape[0],), device=x.device
+            ).long()
+        else:
+            assert isinstance(noise_level, torch.Tensor)
+        z = self.q_sample(x, noise_level)
+        return z, noise_level