Merge pull request #9 from xhlulu/main

Add torch hub support

README.md

 ## PyTorch Implementation of [AnimeGANv2](https://github.com/TachibanaYoshino/AnimeGANv2)
 
 
+**Torch Hub Usage**
+
+You can load Animegan v2 via `torch.hub`:
+
+```python
+import torch
+model = torch.hub.load('bryandlee/animegan2-pytorch', 'generator').eval()
+# convert your image into tensor here
+out = model(img_tensor)
+```
+
+You can load with various configs (more details in [the torch docs](https://pytorch.org/docs/stable/hub.html)):
+```python
+model = torch.hub.load(
+    "bryandlee/animegan2-pytorch",
+    "generator",
+    pretrained=True, # or give URL to a pretrained model
+    device="cuda", # or "cpu" if you don't have a GPU
+    progress=True, # show progress
+)
+```
+
+Currently, the following `pretrained` shorthands are available:
+```python
+model = torch.hub.load("bryandlee/animegan2-pytorch", "generator", pretrained="celeba_distill")
+model = torch.hub.load("bryandlee/animegan2-pytorch", "generator", pretrained="face_paint_512_v1")
+model = torch.hub.load("bryandlee/animegan2-pytorch", "generator", pretrained="face_paint_512_v2")
+model = torch.hub.load("bryandlee/animegan2-pytorch", "generator", pretrained="paprika")
+```
+
+You can also load the `face2paint` util function. First, install dependencies:
+
+```
+pip install torchvision Pillow numpy
+```
+
+Then, import the function using `torch.hub`:
+```python
+face2paint = torch.hub.load(
+    'bryandlee/animegan2-pytorch', 'face2paint', 
+    size=512, device="cpu"
+)
+
+img = Image.open(...).convert("RGB")
+out = face2paint(model, img)
+```
+
 **Updates**
 
 * `2021-10-17` Add weights for [face portrait v2](https://github.com/bryandlee/animegan2-pytorch#additional-models)
@@ -9,7 +56,6 @@
     See demo: [![Hugging Face Spaces](https://img.shields.io/badge/%F0%9F%A4%97%20Hugging%20Face-Spaces-blue)](https://huggingface.co/spaces/akhaliq/AnimeGANv2)
 
 
-
 **Weight Conversion from the Original Repo (Requires TensorFlow 1.x)**
 ```
 git clone https://github.com/TachibanaYoshino/AnimeGANv2
@@ -86,5 +132,3 @@ Trained on <b>512x512</b> face images. Compared to v1, `🔻beautify` `🔺robus
 
 
 </details>
-
-

hubconf.py

+import torch
+
+def generator(pretrained=True, device="cpu", progress=True, check_hash=True):
+    from model import Generator
+
+    release_url = "https://github.com/bryandlee/animegan2-pytorch/raw/main/weights"
+    known = {
+        name: f"{release_url}/{name}.pt"
+        for name in [
+            'celeba_distill', 'face_paint_512_v1', 'face_paint_512_v2', 'paprika'
+        ]
+    }
+
+    device = torch.device(device)
+    model = Generator().to(device)
+
+    if type(pretrained) == str:
+        # Look if a known name is passed, otherwise assume it's a URL
+        ckpt_url = known.get(pretrained, pretrained)
+        pretrained = True
+    else:
+        ckpt_url = known.get('face_paint_512_v2')
+
+    if pretrained is True:
+        state_dict = torch.hub.load_state_dict_from_url(
+            ckpt_url,
+            map_location=device,
+            progress=progress,
+            check_hash=check_hash,
+        )
+        model.load_state_dict(state_dict)
+
+    return model
+
+
+def face2paint(device="cpu", size=512):
+    from PIL import Image
+    from torchvision.transforms.functional import to_tensor, to_pil_image
+
+    def face2paint(
+        model: torch.nn.Module,
+        img: Image.Image,
+        size: int = size,
+        side_by_side: bool = True,
+        device: str = device,
+    ) -> Image.Image:
+        w, h = img.size
+        s = min(w, h)
+        img = img.crop(((w - s) // 2, (h - s) // 2, (w + s) // 2, (h + s) // 2))
+        img = img.resize((size, size), Image.LANCZOS)
+
+        with torch.no_grad():
+            input = to_tensor(img).unsqueeze(0) * 2 - 1
+            output = model(input.to(device)).cpu()[0]
+
+            if side_by_side:
+                output = torch.cat([input[0], output], dim=2)
+
+            output = (output * 0.5 + 0.5).clip(0, 1)
+
+        return to_pil_image(output)
+
+    return face2paint