Adding functions to input custom image

.gitignore

@@ -4,6 +4,7 @@
 __pycache__/
 *.py[cod]
 *$py.class
+*.pyc
 
 # C extensions
 *.so

gan_inv/PTI.py

@@ -0,0 +1,53 @@
+import torch
+from inversion import  inverse_image,get_lr
+
+from tqdm import tqdm
+from torch.nn import functional as F
+from lpips import util
+def toogle_grad(model, flag=True):
+    for p in model.parameters():
+        p.requires_grad = flag
+
+
+class PTI:
+    def __init__(self,G,l2_lambda = 1,max_pti_step = 400, pti_lr = 3e-4 ):
+        self.g_ema = G
+        self.l2_lambda = l2_lambda
+        self.max_pti_step = max_pti_step
+        self.pti_lr = pti_lr
+    def cacl_loss(self,percept, generated_image,real_image):
+
+        mse_loss = F.mse_loss(generated_image, real_image)
+        p_loss = percept(generated_image, real_image).sum()
+        loss = p_loss +self.l2_lambda * mse_loss
+        return loss
+
+    def train(self,img):
+        inversed_result = inverse_image(self.g_ema,img,self.g_ema.img_resolution)
+        w_pivot = inversed_result['latent']
+        ws = w_pivot.repeat([1, self.g_ema.mapping.num_ws, 1])
+        toogle_grad(self.g_ema,True)
+        percept = util.PerceptualLoss(
+            model="net-lin", net="vgg", use_gpu='cuda:0'
+        )
+        optimizer = torch.optim.Adam(self.g_ema.parameters(), lr=self.pti_lr)
+        print('start PTI')
+        pbar = tqdm(range(self.max_pti_step))
+        for i in pbar:
+            lr = get_lr(i, self.pti_lr)
+            optimizer.param_groups[0]["lr"] = lr
+
+            generated_image,feature = self.g_ema.synthesis(ws,noise_mode='const')
+            loss = self.cacl_loss(percept,generated_image,inversed_result['real'])
+            pbar.set_description(
+                (
+                    f"loss: {loss.item():.4f}"
+                )
+            )
+            optimizer.zero_grad()
+            loss.backward()
+            optimizer.step()
+        with torch.no_grad():
+            generated_image = self.g_ema.synthesis(ws, noise_mode='const')
+
+        return generated_image

gan_inv/__init__.py

@@ -0,0 +1,9 @@
+# Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES.  All rights reserved.
+#
+# NVIDIA CORPORATION and its licensors retain all intellectual property
+# and proprietary rights in and to this software, related documentation
+# and any modifications thereto.  Any use, reproduction, disclosure or
+# distribution of this software and related documentation without an express
+# license agreement from NVIDIA CORPORATION is strictly prohibited.
+
+# empty