add inference, amp and channel_last supports for began

Author: CaoE

implementations/began/began.py

@@ -2,6 +2,7 @@
 import os
 import numpy as np
 import math
+import time
 
 import torchvision.transforms as transforms
 from torchvision.utils import save_image
@@ -27,12 +28,17 @@
 parser.add_argument("--img_size", type=int, default=32, help="size of each image dimension")
 parser.add_argument("--channels", type=int, default=1, help="number of image channels")
 parser.add_argument("--sample_interval", type=int, default=400, help="number of image channels")
+parser.add_argument('--inference', action='store_true', default=False)
+parser.add_argument('--precision', default='float32', help='Precision, "float32" or "bfloat16"')
+parser.add_argument('--channels_last', type=int, default=1, help='use channels last format')
+parser.add_argument('--num-iterations', default=100, type=int)
 opt = parser.parse_args()
 print(opt)
 
 img_shape = (opt.channels, opt.img_size, opt.img_size)
 
 cuda = True if torch.cuda.is_available() else False
+Tensor = torch.cuda.FloatTensor if cuda else torch.FloatTensor
 
 
 def weights_init_normal(m):
@@ -68,6 +74,8 @@ def __init__(self):
     def forward(self, noise):
         out = self.l1(noise)
         out = out.view(out.shape[0], 128, self.init_size, self.init_size)
+        if opt.channels_last:
+            out = out.to(memory_format=torch.channels_last)
         img = self.conv_blocks(out)
         return img
 
@@ -94,116 +102,167 @@ def __init__(self):
 
     def forward(self, img):
         out = self.down(img)
+        if opt.channels_last:
+            out = out.contiguous()
         out = self.fc(out.view(out.size(0), -1))
-        out = self.up(out.view(out.size(0), 64, self.down_size, self.down_size))
+        out = out.view(out.size(0), 64, self.down_size, self.down_size)
+        if opt.channels_last:
+            out = out.to(memory_format=torch.channels_last)
+        out = self.up(out)
         return out
 
+def main():
+    # Initialize generator and discriminator
+    generator = Generator()
+    discriminator = Discriminator()
+
+    if cuda:
+        generator.cuda()
+        discriminator.cuda()
+    else:
+        generator.cpu()
+        discriminator.cpu()
+
+    # Initialize weights
+    generator.apply(weights_init_normal)
+    discriminator.apply(weights_init_normal)
+    device = torch.device('cuda') if cuda else torch.device('cpu')
+    if opt.inference:
+        print("----------------Generation---------------")
+        if opt.precision == "bfloat16":
+            cm = torch.cuda.amp.autocast if cuda else torch.cpu.amp.autocast
+            with cm():
+                generate(generator, device=device)
+        else:
+            generate(generator, device=device)
+    else:
+        print("-------------------Train-----------------")
+        train(generator, discriminator)
+
+
+def generate(netG, device):
+    fixed_noise = Variable(Tensor(np.random.normal(0, 1, (10 ** 2, opt.latent_dim))))
+    if opt.channels_last:
+        netG_oob = netG
+        try:
+            netG_oob = netG_oob.to(memory_format=torch.channels_last)
+            print("[INFO] Use NHWC model")
+        except:
+            print("[WARN] Input NHWC failed! Use normal model")
+        netG = netG_oob
+    else:
+        fixed_noise = fixed_noise.to(device=device)
+    netG.eval()
+
+    total_iters = opt.num_iterations
+    with torch.no_grad():
+        tic = time.time() 
+        for i in range(total_iters):         
+            fake = netG(fixed_noise)
+    toc = time.time() - tic
+    print("Throughput: %.2f image/sec, batchsize: %d, latency = %.2f ms"%((opt.num_iterations*opt.batch_size)/toc, opt.batch_size, 1000*toc/opt.num_iterations))
 
-# Initialize generator and discriminator
-generator = Generator()
-discriminator = Discriminator()
-
-if cuda:
-    generator.cuda()
-    discriminator.cuda()
-
-# Initialize weights
-generator.apply(weights_init_normal)
-discriminator.apply(weights_init_normal)
-
-# Configure data loader
-os.makedirs("../../data/mnist", exist_ok=True)
-dataloader = torch.utils.data.DataLoader(
-    datasets.MNIST(
-        "../../data/mnist",
-        train=True,
-        download=True,
-        transform=transforms.Compose(
-            [transforms.Resize(opt.img_size), transforms.ToTensor(), transforms.Normalize([0.5], [0.5])]
-        ),
-    ),
-    batch_size=opt.batch_size,
-    shuffle=True,
-)
-
-# Optimizers
-optimizer_G = torch.optim.Adam(generator.parameters(), lr=opt.lr, betas=(opt.b1, opt.b2))
-optimizer_D = torch.optim.Adam(discriminator.parameters(), lr=opt.lr, betas=(opt.b1, opt.b2))
-
-Tensor = torch.cuda.FloatTensor if cuda else torch.FloatTensor
 
 # ----------
 #  Training
 # ----------
 
-# BEGAN hyper parameters
-gamma = 0.75
-lambda_k = 0.001
-k = 0.0
-
-for epoch in range(opt.n_epochs):
-    for i, (imgs, _) in enumerate(dataloader):
-
-        # Configure input
-        real_imgs = Variable(imgs.type(Tensor))
-
-        # -----------------
-        #  Train Generator
-        # -----------------
-
-        optimizer_G.zero_grad()
-
-        # Sample noise as generator input
-        z = Variable(Tensor(np.random.normal(0, 1, (imgs.shape[0], opt.latent_dim))))
-
-        # Generate a batch of images
-        gen_imgs = generator(z)
-
-        # Loss measures generator's ability to fool the discriminator
-        g_loss = torch.mean(torch.abs(discriminator(gen_imgs) - gen_imgs))
-
-        g_loss.backward()
-        optimizer_G.step()
-
-        # ---------------------
-        #  Train Discriminator
-        # ---------------------
-
-        optimizer_D.zero_grad()
-
-        # Measure discriminator's ability to classify real from generated samples
-        d_real = discriminator(real_imgs)
-        d_fake = discriminator(gen_imgs.detach())
-
-        d_loss_real = torch.mean(torch.abs(d_real - real_imgs))
-        d_loss_fake = torch.mean(torch.abs(d_fake - gen_imgs.detach()))
-        d_loss = d_loss_real - k * d_loss_fake
-
-        d_loss.backward()
-        optimizer_D.step()
-
-        # ----------------
-        # Update weights
-        # ----------------
-
-        diff = torch.mean(gamma * d_loss_real - d_loss_fake)
-
-        # Update weight term for fake samples
-        k = k + lambda_k * diff.item()
-        k = min(max(k, 0), 1)  # Constraint to interval [0, 1]
-
-        # Update convergence metric
-        M = (d_loss_real + torch.abs(diff)).data[0]
-
-        # --------------
-        # Log Progress
-        # --------------
-
-        print(
-            "[Epoch %d/%d] [Batch %d/%d] [D loss: %f] [G loss: %f] -- M: %f, k: %f"
-            % (epoch, opt.n_epochs, i, len(dataloader), d_loss.item(), g_loss.item(), M, k)
-        )
-
-        batches_done = epoch * len(dataloader) + i
-        if batches_done % opt.sample_interval == 0:
-            save_image(gen_imgs.data[:25], "images/%d.png" % batches_done, nrow=5, normalize=True)
+def train(netG, netD):
+    # BEGAN hyper parameters
+    gamma = 0.75
+    lambda_k = 0.001
+    k = 0.0
+
+    # Configure data loader
+    os.makedirs("../../data/mnist", exist_ok=True)
+    dataloader = torch.utils.data.DataLoader(
+        datasets.MNIST(
+            "../../data/mnist",
+            train=True,
+            download=True,
+            transform=transforms.Compose(
+                [transforms.Resize(opt.img_size), transforms.ToTensor(), transforms.Normalize([0.5], [0.5])]
+            ),
+        ),
+        batch_size=opt.batch_size,
+        shuffle=True,
+    )
+    # Optimizers
+    optimizer_G = torch.optim.Adam(netG.parameters(), lr=opt.lr, betas=(opt.b1, opt.b2))
+    optimizer_D = torch.optim.Adam(netD.parameters(), lr=opt.lr, betas=(opt.b1, opt.b2))
+
+    for epoch in range(opt.n_epochs):
+        for i, (imgs, _) in enumerate(dataloader):
+            if opt.channels_last:
+                imgs_oob = imgs
+                try:
+                    imgs_oob = imgs_oob.to(memory_format=torch.channels_last)
+                    print("[INFO] Use NHWC input")
+                except:
+                    print("[WARN] Input NHWC failed! Use normal input")
+                imgs = imgs_oob
+            # Configure input
+            real_imgs = Variable(imgs.type(Tensor))
+
+            # -----------------
+            #  Train Generator
+            # -----------------
+
+            optimizer_G.zero_grad()
+
+            # Sample noise as generator input
+            z = Variable(Tensor(np.random.normal(0, 1, (imgs.shape[0], opt.latent_dim))))
+
+            # Generate a batch of images
+            gen_imgs = netG(z)
+
+            # Loss measures generator's ability to fool the discriminator
+            g_loss = torch.mean(torch.abs(netD(gen_imgs) - gen_imgs))
+
+            g_loss.backward()
+            optimizer_G.step()
+
+            # ---------------------
+            #  Train Discriminator
+            # ---------------------
+
+            optimizer_D.zero_grad()
+
+            # Measure discriminator's ability to classify real from generated samples
+            d_real = netD(real_imgs)
+            d_fake = netD(gen_imgs.detach())
+
+            d_loss_real = torch.mean(torch.abs(d_real - real_imgs))
+            d_loss_fake = torch.mean(torch.abs(d_fake - gen_imgs.detach()))
+            d_loss = d_loss_real - k * d_loss_fake
+
+            d_loss.backward()
+            optimizer_D.step()
+
+            # ----------------
+            # Update weights
+            # ----------------
+
+            diff = torch.mean(gamma * d_loss_real - d_loss_fake)
+
+            # Update weight term for fake samples
+            k = k + lambda_k * diff.item()
+            k = min(max(k, 0), 1)  # Constraint to interval [0, 1]
+
+            # Update convergence metric
+            M = (d_loss_real + torch.abs(diff)).data.item()
+
+            # --------------
+            # Log Progress
+            # --------------
+
+            print(
+                "[Epoch %d/%d] [Batch %d/%d] [D loss: %f] [G loss: %f] -- M: %f, k: %f"
+                % (epoch, opt.n_epochs, i, len(dataloader), d_loss.item(), g_loss.item(), M, k)
+            )
+
+            batches_done = epoch * len(dataloader) + i
+            if batches_done % opt.sample_interval == 0:
+                save_image(gen_imgs.data[:25], "images/%d.png" % batches_done, nrow=5, normalize=True)
+if __name__ == '__main__':
+    main()