1 files changed, 123 insertions, 0 deletions
diff --git a/modules/swinir_model.py b/modules/swinir_model.py
new file mode 100644
index 00000000..e86d0789
--- /dev/null
+++ b/modules/swinir_model.py
@@ -0,0 +1,123 @@
+import sys
+import traceback
+import cv2
+import os
+import contextlib
+import numpy as np
+from PIL import Image
+import torch
+import modules.images
+from modules.shared import cmd_opts, opts, device
+from modules.swinir_arch import SwinIR as net
+
+precision_scope = (
+    torch.autocast if cmd_opts.precision == "autocast" else contextlib.nullcontext
+)
+
+
+def load_model(filename, scale=4):
+    model = net(
+        upscale=scale,
+        in_chans=3,
+        img_size=64,
+        window_size=8,
+        img_range=1.0,
+        depths=[6, 6, 6, 6, 6, 6, 6, 6, 6],
+        embed_dim=240,
+        num_heads=[8, 8, 8, 8, 8, 8, 8, 8, 8],
+        mlp_ratio=2,
+        upsampler="nearest+conv",
+        resi_connection="3conv",
+    )
+
+    pretrained_model = torch.load(filename)
+    model.load_state_dict(pretrained_model["params_ema"], strict=True)
+    if not cmd_opts.no_half:
+        model = model.half()
+    return model
+
+
+def load_models(dirname):
+    for file in os.listdir(dirname):
+        path = os.path.join(dirname, file)
+        model_name, extension = os.path.splitext(file)
+
+        if extension != ".pt" and extension != ".pth":
+            continue
+
+        try:
+            modules.shared.sd_upscalers.append(UpscalerSwin(path, model_name))
+        except Exception:
+            print(f"Error loading SwinIR model: {path}", file=sys.stderr)
+            print(traceback.format_exc(), file=sys.stderr)
+
+
+def upscale(
+    img,
+    model,
+    tile=opts.SWIN_tile,
+    tile_overlap=opts.SWIN_tile_overlap,
+    window_size=8,
+    scale=4,
+):
+    img = np.array(img)
+    img = img[:, :, ::-1]
+    img = np.moveaxis(img, 2, 0) / 255
+    img = torch.from_numpy(img).float()
+    img = img.unsqueeze(0).to(device)
+    with torch.no_grad(), precision_scope("cuda"):
+        _, _, h_old, w_old = img.size()
+        h_pad = (h_old // window_size + 1) * window_size - h_old
+        w_pad = (w_old // window_size + 1) * window_size - w_old
+        img = torch.cat([img, torch.flip(img, [2])], 2)[:, :, : h_old + h_pad, :]
+        img = torch.cat([img, torch.flip(img, [3])], 3)[:, :, :, : w_old + w_pad]
+        output = inference(img, model, tile, tile_overlap, window_size, scale)
+        output = output[..., : h_old * scale, : w_old * scale]
+        output = output.data.squeeze().float().cpu().clamp_(0, 1).numpy()
+        if output.ndim == 3:
+            output = np.transpose(
+                output[[2, 1, 0], :, :], (1, 2, 0)
+            )  # CHW-RGB to HCW-BGR
+        output = (output * 255.0).round().astype(np.uint8)  # float32 to uint8
+        return Image.fromarray(output, "RGB")
+
+
+def inference(img, model, tile, tile_overlap, window_size, scale):
+    # test the image tile by tile
+    b, c, h, w = img.size()
+    tile = min(tile, h, w)
+    assert tile % window_size == 0, "tile size should be a multiple of window_size"
+    sf = scale
+
+    stride = tile - tile_overlap
+    h_idx_list = list(range(0, h - tile, stride)) + [h - tile]
+    w_idx_list = list(range(0, w - tile, stride)) + [w - tile]
+    E = torch.zeros(b, c, h * sf, w * sf, dtype=torch.half, device=device).type_as(img)
+    W = torch.zeros_like(E, dtype=torch.half, device=device)
+
+    for h_idx in h_idx_list:
+        for w_idx in w_idx_list:
+            in_patch = img[..., h_idx : h_idx + tile, w_idx : w_idx + tile]
+            out_patch = model(in_patch)
+            out_patch_mask = torch.ones_like(out_patch)
+
+            E[
+                ..., h_idx * sf : (h_idx + tile) * sf, w_idx * sf : (w_idx + tile) * sf
+            ].add_(out_patch)
+            W[
+                ..., h_idx * sf : (h_idx + tile) * sf, w_idx * sf : (w_idx + tile) * sf
+            ].add_(out_patch_mask)
+    output = E.div_(W)
+
+    return output
+
+
+class UpscalerSwin(modules.images.Upscaler):
+    def __init__(self, filename, title):
+        self.name = title
+        self.model = load_model(filename)
+
+    def do_upscale(self, img):
+        model = self.model.to(device)
+        img = upscale(img, model)
+        return img