Merge pull request #2 from LielinJiang/multiprocess-dataset

Support multiprocess dict dataset

.gitignore

@@ -101,3 +101,7 @@ venv.bak/
 
 # mypy
 .mypy_cache/
+
+# data
+data/
+output_dir/
\ No newline at end of file

.pre-commit-config.yaml

+-   repo: local
+    hooks:
+    -   id: yapf
+        name: yapf
+        entry: yapf
+        language: system
+        args: [-i, --style .style.yapf]
+        files: \.py$
+
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    sha: a11d9314b22d8f8c7556443875b731ef05965464
+    hooks:
+    -   id: check-merge-conflict
+    -   id: check-symlinks
+    -   id: end-of-file-fixer
+    -   id: trailing-whitespace
+    -   id: detect-private-key
+    -   id: check-symlinks
+    -   id: check-added-large-files
+
+-   repo: local
+    hooks:
+    -   id: flake8
+        name: flake8
+        entry: flake8
+        language: system
+        args:
+        -   --count
+        -   --select=E9,F63,F7,F82
+        -   --show-source
+        -   --statistics
+        files: \.py$
+
+-   repo: local
+    hooks:
+    -   id: copyright_checker
+        name: copyright_checker
+        entry: python ./.copyright.hook
+        language: system
+        files: \.(c|cc|cxx|cpp|cu|h|hpp|hxx|proto|py)$
+        exclude: (?!.*third_party)^.*$
\ No newline at end of file

.style.yapf

+[style]
+based_on_style = pep8
+column_limit = 80
\ No newline at end of file

README.md

+English | [简体中文](./README.md)
+
 # PaddleGAN
 
 still under development!!
 
+## Download Dataset
+This script could download several dataset for paired images for image2image translation task.
+
+```
+cd PaddleGAN/script/
+bash pix2pix_download.sh [cityscapes|facades|edges2handbags|edges2shoes|maps]
+```
 ## Train
 ```
 python -u tools/main.py --config-file configs/cyclegan-cityscapes.yaml

configs/cyclegan-cityscapes.yaml → configs/cyclegan_cityscapes.yaml

@@ -26,7 +26,7 @@ model:
 
 dataset:
   train:
-    name: UnalignedDataset
+    name: UnpairedDataset
     dataroot: data/cityscapes
     phase: train
     max_dataset_size: inf

configs/cyclegan-horse2zebra.yaml → configs/cyclegan_horse2zebra.yaml

@@ -26,7 +26,7 @@ model:
 
 dataset:
   train:
-    name: UnalignedDataset
+    name: UnpairedDataset
     dataroot: data/horse2zebra
     phase: train
     max_dataset_size: inf

configs/pix2pix-cityscapes.yaml → configs/pix2pix_cityscapes.yaml

@@ -23,7 +23,7 @@ model:
 
 dataset:
   train:
-    name: AlignedDataset
+    name: PairedDataset
     dataroot: data/cityscapes
     phase: train
     max_dataset_size: inf
@@ -38,7 +38,7 @@ dataset:
       preprocess: resize_and_crop
       no_flip: False
   test:
-    name: AlignedDataset
+    name: PairedDataset
     dataroot: data/cityscapes/
     phase: test
     max_dataset_size: inf

configs/pix2pix-cityscapes-2gpus.yaml → configs/pix2pix_cityscapes_2gpus.yaml

@@ -23,7 +23,7 @@ model:
 
 dataset:
   train:
-    name: AlignedDataset
+    name: PairedDataset
     dataroot: data/cityscapes
     phase: train
     max_dataset_size: inf
@@ -38,7 +38,7 @@ dataset:
       preprocess: resize_and_crop
       no_flip: False
   test:
-    name: AlignedDataset
+    name: PairedDataset
     dataroot: data/cityscapes/
     phase: test
     max_dataset_size: inf

configs/pix2pix_facades.yaml

+epochs: 200
+isTrain: True
+output_dir: output_dir
+lambda_L1: 100
+
+model:
+  name: Pix2PixModel
+  generator:
+    name: UnetGenerator
+    norm_type: batch
+    input_nc: 3
+    output_nc: 3
+    num_downs: 8 #unet256
+    ngf: 64
+    use_dropout: False
+  discriminator:
+    name: NLayerDiscriminator
+    ndf: 64
+    n_layers: 3
+    input_nc: 6
+    norm_type: batch
+  gan_mode: vanilla
+
+dataset:
+  train:
+    name: PairedDataset
+    dataroot: data/facades/
+    phase: train
+    max_dataset_size: inf
+    direction: BtoA
+    input_nc: 3
+    output_nc: 3
+    serial_batches: False
+    pool_size: 0
+    transform:
+      load_size: 286
+      crop_size: 256
+      preprocess: resize_and_crop
+      no_flip: False
+  test:
+    name: PairedDataset
+    dataroot: data/facades/
+    phase: test
+    max_dataset_size: inf
+    direction: BtoA
+    input_nc: 3
+    output_nc: 3
+    serial_batches: True
+    pool_size: 50
+    transform:
+      load_size: 256
+      crop_size: 256
+      preprocess: resize_and_crop
+      no_flip: True
+
+optimizer:
+  name: Adam
+  beta1: 0.5
+  lr_scheduler:
+    name: linear
+    learning_rate: 0.0002
+    start_epoch: 100
+    decay_epochs: 100
+
+log_config:
+  interval: 100
+  visiual_interval: 500
+
+snapshot_config:
+  interval: 5

ppgan/datasets/__init__.py

-from .unaligned_dataset import UnalignedDataset
+from .unpaired_dataset import UnpairedDataset
 from .single_dataset import SingleDataset
-from .aligned_dataset import AlignedDataset
+from .paired_dataset import PairedDataset

ppgan/datasets/builder.py

+import time
 import paddle
 import numbers
 import numpy as np
@@ -23,7 +24,7 @@ class DictDataset(paddle.io.Dataset):
         
         for k, v in single_item.items():
             if not isinstance(v, (numbers.Number, np.ndarray)):
-                self.non_tensor_dict.update({k: {}})
+                setattr(self, k, Manager().dict())
                 self.non_tensor_keys_set.add(k)
             else:
                 self.tensor_keys_set.add(k)
@@ -38,9 +39,7 @@ class DictDataset(paddle.io.Dataset):
             if isinstance(v, (numbers.Number, np.ndarray)):
                 tmp_list.append(v)
             else:
-                tmp_dict = self.non_tensor_dict[k]
-                tmp_dict.update({index: v})
-                self.non_tensor_dict[k] = tmp_dict
+                getattr(self, k).update({index: v})
 
         tmp_list.append(index)
         return tuple(tmp_list)
@@ -50,11 +49,11 @@ class DictDataset(paddle.io.Dataset):
 
     def reset(self):
         for k in self.non_tensor_keys_set:
-            self.non_tensor_dict[k] = {}
+            setattr(self, k, Manager().dict())
 
 
 class DictDataLoader():
-    def __init__(self, dataset, batch_size, is_train, num_workers=0):
+    def __init__(self, dataset, batch_size, is_train, num_workers=4):
 
         self.dataset = DictDataset(dataset)
 
@@ -97,7 +96,7 @@ class DictDataLoader():
         if isinstance(indexs, paddle.Variable):
             indexs = indexs.numpy()
         current_items = []
-        items = self.dataset.non_tensor_dict[key]
+        items = getattr(self.dataset, key)
 
         for index in indexs:
             current_items.append(items[index])
@@ -105,6 +104,7 @@ class DictDataLoader():
         return current_items
 
 
+
 def build_dataloader(cfg, is_train=True):
     dataset = DATASETS.get(cfg.name)(cfg)
     

ppgan/datasets/aligned_dataset.py → ppgan/datasets/paired_dataset.py

@@ -8,19 +8,19 @@ from .builder import DATASETS
 
 
 @DATASETS.register()
-class AlignedDataset(BaseDataset):
+class PairedDataset(BaseDataset):
     """A dataset class for paired image dataset.
     """
 
-    def __init__(self, opt):
+    def __init__(self, cfg):
         """Initialize this dataset class.
 
         Args:
             cfg (dict) -- stores all the experiment flags
         """
-        BaseDataset.__init__(self, opt)
-        self.dir_AB = os.path.join(opt.dataroot, opt.phase)  # get the image directory
-        self.AB_paths = sorted(make_dataset(self.dir_AB, opt.max_dataset_size))  # get image paths
+        BaseDataset.__init__(self, cfg)
+        self.dir_AB = os.path.join(cfg.dataroot, cfg.phase)  # get the image directory
+        self.AB_paths = sorted(make_dataset(self.dir_AB, cfg.max_dataset_size))  # get image paths
         assert(self.cfg.transform.load_size >= self.cfg.transform.crop_size)   # crop_size should be smaller than the size of loaded image
         self.input_nc = self.cfg.output_nc if self.cfg.direction == 'BtoA' else self.cfg.input_nc
         self.output_nc = self.cfg.input_nc if self.cfg.direction == 'BtoA' else self.cfg.output_nc

ppgan/datasets/unaligned_dataset.py → ppgan/datasets/unpaired_dataset.py

@@ -8,7 +8,7 @@ from .builder import DATASETS
 
 
 @DATASETS.register()
-class UnalignedDataset(BaseDataset):
+class UnpairedDataset(BaseDataset):
     """
     """
 

ppgan/models/cycle_gan_model.py

@@ -5,7 +5,7 @@ from .builder import MODELS
 from .generators.builder import build_generator
 from .discriminators.builder import build_discriminator
 from .losses import GANLoss
-# from ..modules.nn import L1Loss
+
 from ..solver import build_optimizer
 from ..utils.image_pool import ImagePool
 
@@ -27,7 +27,7 @@ class CycleGANModel(BaseModel):
         """Initialize the CycleGAN class.
 
         Parameters:
-            opt (Option class)-- stores all the experiment flags; needs to be a subclass of BaseOptions
+            opt (config)-- stores all the experiment flags; needs to be a subclass of Dict
         """
         BaseModel.__init__(self, opt)
         # specify the training losses you want to print out. The training/test scripts will call <BaseModel.get_current_losses>
@@ -35,12 +35,15 @@ class CycleGANModel(BaseModel):
         # specify the images you want to save/display. The training/test scripts will call <BaseModel.get_current_visuals>
         visual_names_A = ['real_A', 'fake_B', 'rec_A']
         visual_names_B = ['real_B', 'fake_A', 'rec_B']
-        if self.isTrain and self.opt.lambda_identity > 0.0:  # if identity loss is used, we also visualize idt_B=G_A(B) ad idt_A=G_A(B)
+
+         # if identity loss is used, we also visualize idt_B=G_A(B) ad idt_A=G_A(B)
+        if self.isTrain and self.opt.lambda_identity > 0.0:
             visual_names_A.append('idt_B')
             visual_names_B.append('idt_A')
 
-        self.visual_names = visual_names_A + visual_names_B  # combine visualizations for A and B
-        # specify the models you want to save to the disk. The training/test scripts will call <BaseModel.save_networks> and <BaseModel.load_networks>.
+        # combine visualizations for A and B
+        self.visual_names = visual_names_A + visual_names_B
+        # specify the models you want to save to the disk.
         if self.isTrain:
             self.model_names = ['G_A', 'G_B', 'D_A', 'D_B']
         else:  # during test time, only load Gs
@@ -59,22 +62,22 @@ class CycleGANModel(BaseModel):
         if self.isTrain:
             if opt.lambda_identity > 0.0:  # only works when input and output images have the same number of channels
                 assert(opt.dataset.train.input_nc == opt.dataset.train.output_nc)
-            self.fake_A_pool = ImagePool(opt.dataset.train.pool_size)  # create image buffer to store previously generated images
-            self.fake_B_pool = ImagePool(opt.dataset.train.pool_size)  # create image buffer to store previously generated images
+            # create image buffer to store previously generated images
+            self.fake_A_pool = ImagePool(opt.dataset.train.pool_size)
+            # create image buffer to store previously generated images
+            self.fake_B_pool = ImagePool(opt.dataset.train.pool_size)
             # define loss functions
-            self.criterionGAN = GANLoss(opt.model.gan_mode, [[[[1.0]]]], [[[[0.0]]]])#.to(self.device)  # define GAN loss.
+            self.criterionGAN = GANLoss(opt.model.gan_mode)
             self.criterionCycle = paddle.nn.L1Loss() 
             self.criterionIdt = paddle.nn.L1Loss()
             
             self.optimizer_G =  build_optimizer(opt.optimizer, parameter_list=self.netG_A.parameters() + self.netG_B.parameters())
             self.optimizer_D = build_optimizer(opt.optimizer, parameter_list=self.netD_A.parameters() + self.netD_B.parameters())
-            # self.optimizer_DA = build_optimizer(opt.optimizer, parameter_list=self.netD_A.parameters()) 
-            # self.optimizer_DB = build_optimizer(opt.optimizer, parameter_list=self.netD_B.parameters()) 
+
             self.optimizers.append(self.optimizer_G)
             self.optimizers.append(self.optimizer_D)
-            # self.optimizers.append(self.optimizer_DA)
-            # self.optimizers.append(self.optimizer_DB)
-            self.optimizer_names.extend(['optimizer_G', 'optimizer_D'])#A', 'optimizer_DB'])
+
+            self.optimizer_names.extend(['optimizer_G', 'optimizer_D'])
 
     def set_input(self, input):
         """Unpack input data from the dataloader and perform necessary pre-processing steps.
@@ -102,7 +105,7 @@ class CycleGANModel(BaseModel):
             self.image_paths = input['A_paths']
         elif 'B_paths' in input:
             self.image_paths = input['B_paths']
-        # self.image_paths = input['A_paths' if AtoB else 'B_paths']
+
 
     def forward(self):
         """Run forward pass; called by both functions <optimize_parameters> and <test>."""
@@ -115,20 +118,6 @@ class CycleGANModel(BaseModel):
             self.rec_B = self.netG_A(self.fake_A)   # G_A(G_B(B))
 
 
-    # def forward_test(self, input):
-    #     input = paddle.imperative.to_variable(input)
-    #     net_g = getattr(self, 'netG_' + self.opt.dataset.test.direction[0])
-    #     return net_g(input)
-
-    # def test(self, input):
-    #     """Forward function used in test time.
-
-    #     This function wraps <forward> function in no_grad() so we don't save intermediate steps for backprop
-    #     It also calls <compute_visuals> to produce additional visualization results
-    #     """
-    #     with paddle.imperative.no_grad():
-    #         return self.forward_test(input)
-
     def backward_D_basic(self, netD, real, fake):
         """Calculate GAN loss for the discriminator
 
@@ -193,27 +182,26 @@ class CycleGANModel(BaseModel):
     def optimize_parameters(self):
         """Calculate losses, gradients, and update network weights; called in every training iteration"""
         # forward
-        self.forward()      # compute fake images and reconstruction images.
+        # compute fake images and reconstruction images.
+        self.forward()
         # G_A and G_B
-        self.set_requires_grad([self.netD_A, self.netD_B], False)  # Ds require no gradients when optimizing Gs
-        self.optimizer_G.clear_gradients() #zero_grad()  # set G_A and G_B's gradients to zero
-        self.backward_G()             # calculate gradients for G_A and G_B
-        self.optimizer_G.minimize(self.loss_G) #step()       # update G_A and G_B's weights
-        # self.optimizer_G.clear_gradients()
-        # self.optimizer_G.clear_gradients()
+        # Ds require no gradients when optimizing Gs
+        self.set_requires_grad([self.netD_A, self.netD_B], False)
+        # set G_A and G_B's gradients to zero
+        self.optimizer_G.clear_gradients()
+        # calculate gradients for G_A and G_B
+        self.backward_G()
+        # update G_A and G_B's weights
+        self.optimizer_G.minimize(self.loss_G)
         # D_A and D_B
         self.set_requires_grad([self.netD_A, self.netD_B], True)
-        # self.set_requires_grad(self.netD_A, True)
-        self.optimizer_D.clear_gradients() #zero_grad()   # set D_A and D_B's gradients to zero
-        self.backward_D_A()      # calculate gradients for D_A
-        self.backward_D_B()      # calculate graidents for D_B
-        self.optimizer_D.minimize(self.loss_D_A + self.loss_D_B)  # update D_A and D_B's weights
-        # self.backward_D_A()      # calculate gradients for D_A
-        # self.optimizer_DA.minimize(self.loss_D_A) #step()  # update D_A and D_B's weights
-        # self.optimizer_DA.clear_gradients() #zero_g
-        # self.set_requires_grad(self.netD_B, True)
-        # self.optimizer_DB.clear_gradients() #zero_grad()   # set D_A and D_B's gradients to zero
-
-        # self.backward_D_B()      # calculate graidents for D_B
-        # self.optimizer_DB.minimize(self.loss_D_B) #step()  # update D_A and D_B's weights
-        # self.optimizer_DB.clear_gradients() #zero_grad()   # set D_A and D_B's gradients to zero
+
+        # set D_A and D_B's gradients to zero
+        self.optimizer_D.clear_gradients()
+        # calculate gradients for D_A
+        self.backward_D_A()
+        # calculate graidents for D_B
+        self.backward_D_B()
+          # update D_A and D_B's weights
+        self.optimizer_D.minimize(self.loss_D_A + self.loss_D_B)
+

ppgan/models/losses.py

@@ -4,6 +4,7 @@ import numpy as np
 
 from ..modules.nn import BCEWithLogitsLoss
 
+
 class GANLoss(paddle.fluid.dygraph.Layer):
     """Define different GAN objectives.
 
@@ -23,16 +24,14 @@ class GANLoss(paddle.fluid.dygraph.Layer):
         LSGAN needs no sigmoid. vanilla GANs will handle it with BCEWithLogitsLoss.
         """
         super(GANLoss, self).__init__()
-        self.real_label = paddle.fluid.dygraph.to_variable(np.array(target_real_label))
-        self.fake_label = paddle.fluid.dygraph.to_variable(np.array(target_fake_label))
-        # self.real_label.stop_gradients = True
-        # self.fake_label.stop_gradients = True
+        self.target_real_label = target_real_label
+        self.target_fake_label = target_fake_label
 
         self.gan_mode = gan_mode
         if gan_mode == 'lsgan':
             self.loss = nn.MSELoss()
         elif gan_mode == 'vanilla':
-            self.loss = BCEWithLogitsLoss()#nn.BCEWithLogitsLoss()
+            self.loss = BCEWithLogitsLoss()
         elif gan_mode in ['wgangp']:
             self.loss = None
         else:
@@ -50,14 +49,16 @@ class GANLoss(paddle.fluid.dygraph.Layer):
         """
 
         if target_is_real:
-            target_tensor = paddle.fill_constant(shape=paddle.shape(prediction), value=1.0, dtype='float32')#self.real_label
+            if not hasattr(self, 'target_real_tensor'):
+                self.target_real_tensor = paddle.fill_constant(shape=paddle.shape(prediction), value=self.target_real_label, dtype='float32')
+            target_tensor = self.target_real_tensor
         else:
-            target_tensor = paddle.fill_constant(shape=paddle.shape(prediction), value=0.0, dtype='float32')#self.fake_label
+            if not hasattr(self, 'target_fake_tensor'):
+                self.target_fake_tensor = paddle.fill_constant(shape=paddle.shape(prediction), value=self.target_fake_label, dtype='float32')
+            target_tensor = self.target_fake_tensor
 
-        # target_tensor = paddle.cast(target_tensor, prediction.dtype)
-        # target_tensor = paddle.expand_as(target_tensor, prediction)
         # target_tensor.stop_gradient = True
-        return target_tensor#paddle.expand_as(target_tensor, prediction)
+        return target_tensor
 
     def __call__(self, prediction, target_is_real):
         """Calculate loss given Discriminator's output and grount truth labels.

ppgan/models/pix2pix_model.py

-# import torch
-# import paddle
-# from .base_model import BaseModel
-# from . import networks
 import paddle
 from .base_model import BaseModel
 
@@ -9,7 +5,7 @@ from .builder import MODELS
 from .generators.builder import build_generator
 from .discriminators.builder import build_discriminator
 from .losses import GANLoss
-# from ..modules.nn import L1Loss
+
 from ..solver import build_optimizer
 from ..utils.image_pool import ImagePool
 
@@ -18,10 +14,10 @@ from ..utils.image_pool import ImagePool
 class Pix2PixModel(BaseModel):
     """ This class implements the pix2pix model, for learning a mapping from input images to output images given paired data.
 
-    The model training requires '--dataset_mode aligned' dataset.
+    The model training requires 'paired' dataset.
     By default, it uses a '--netG unet256' U-Net generator,
-    a '--netD basic' discriminator (PatchGAN),
-    and a '--gan_mode' vanilla GAN loss (the cross-entropy objective used in the orignal GAN paper).
+    a '--netD basic' discriminator (from PatchGAN),
+    and a vanilla GAN loss (the cross-entropy objective used in the orignal GAN paper).
 
     pix2pix paper: https://arxiv.org/pdf/1611.07004.pdf
     """
@@ -30,41 +26,37 @@ class Pix2PixModel(BaseModel):
         """Initialize the pix2pix class.
 
         Parameters:
-            opt (Option class)-- stores all the experiment flags; needs to be a subclass of BaseOptions
+            opt (config dict)-- stores all the experiment flags; needs to be a subclass of Dict
         """
         BaseModel.__init__(self, opt)
         # specify the training losses you want to print out. The training/test scripts will call <BaseModel.get_current_losses>
         self.loss_names = ['G_GAN', 'G_L1', 'D_real', 'D_fake']
         # specify the images you want to save/display. The training/test scripts will call <BaseModel.get_current_visuals>
         self.visual_names = ['real_A', 'fake_B', 'real_B']
-        # specify the models you want to save to the disk. The training/test scripts will call <BaseModel.save_networks> and <BaseModel.load_networks>
+        # specify the models you want to save to the disk.
         if self.isTrain:
             self.model_names = ['G', 'D']
-        else:  # during test time, only load G
+        else:
+            # during test time, only load G
             self.model_names = ['G']
+
         # define networks (both generator and discriminator)
         self.netG = build_generator(opt.model.generator)
-        # self.netG = networks.define_G(opt.input_nc, opt.output_nc, opt.ngf, opt.netG, opt.norm,
-        #                               not opt.no_dropout, opt.init_type, opt.init_gain, self.gpu_ids)
 
-        if self.isTrain:  # define a discriminator; conditional GANs need to take both input and output images; Therefore, #channels for D is input_nc + output_nc
+
+        # define a discriminator; conditional GANs need to take both input and output images; Therefore, #channels for D is input_nc + output_nc
+        if self.isTrain:
             self.netD = build_discriminator(opt.model.discriminator)
-            # self.netD = networks.define_D(opt.input_nc + opt.output_nc, opt.ndf, opt.netD,
-            #                               opt.n_layers_D, opt.norm, opt.init_type, opt.init_gain, self.gpu_ids)
+
 
         if self.isTrain:
             # define loss functions
-            self.criterionGAN = GANLoss(opt.model.gan_mode, [[[[1.0]]]], [[[[0.0]]]])#.to(self.device)
+            self.criterionGAN = GANLoss(opt.model.gan_mode)
             self.criterionL1 = paddle.nn.L1Loss()
-            # initialize optimizers; schedulers will be automatically created by function <BaseModel.setup>.
-            # self.optimizer_G = torch.optim.Adam(self.netG.parameters(), lr=opt.lr, betas=(opt.beta1, 0.999))
-            # self.optimizer_D = torch.optim.Adam(self.netD.parameters(), lr=opt.lr, betas=(opt.beta1, 0.999))
-            # FIXME: step per epoch
-            # lr_scheduler_g = self.build_lr_scheduler(opt.lr, step_per_epoch=2975)
-            # lr_scheduler_d = self.build_lr_scheduler(opt.lr, step_per_epoch=2975)
-            # lr_scheduler = self.build_lr_scheduler()
-            self.optimizer_G = build_optimizer(opt.optimizer, parameter_list=self.netG.parameters()) #paddle.optimizer.Adam(learning_rate=lr_scheduler_g, parameter_list=self.netG.parameters(), beta1=opt.beta1)
-            self.optimizer_D = build_optimizer(opt.optimizer, parameter_list=self.netD.parameters()) #paddle.optimizer.Adam(learning_rate=lr_scheduler_d, parameter_list=self.netD.parameters(), beta1=opt.beta1)
+
+            # build optimizers
+            self.optimizer_G = build_optimizer(opt.optimizer, parameter_list=self.netG.parameters())
+            self.optimizer_D = build_optimizer(opt.optimizer, parameter_list=self.netD.parameters()) 
 
             self.optimizers.append(self.optimizer_G)
             self.optimizers.append(self.optimizer_D)
@@ -78,16 +70,12 @@ class Pix2PixModel(BaseModel):
 
         The option 'direction' can be used to swap images in domain A and domain B.
         """
-        # AtoB = self.opt.direction == 'AtoB'
-        # self.real_A = input['A' if AtoB else 'B'].to(self.device)
-        # self.real_B = input['B' if AtoB else 'A'].to(self.device)
-        # self.image_paths = input['A_paths' if AtoB else 'B_paths']
+
         AtoB = self.opt.dataset.train.direction == 'AtoB'
         self.real_A = paddle.imperative.to_variable(input['A' if AtoB else 'B'])
         self.real_B = paddle.imperative.to_variable(input['B' if AtoB else 'A'])
         self.image_paths = input['A_paths' if AtoB else 'B_paths']
-        # self.real_A = paddle.imperative.to_variable(input[0] if AtoB else input[1])
-        # self.real_B = paddle.imperative.to_variable(input[1] if AtoB else input[0])
+ 
 
     def forward(self):
         """Run forward pass; called by both functions <optimize_parameters> and <test>."""
@@ -97,19 +85,11 @@ class Pix2PixModel(BaseModel):
         input = paddle.imperative.to_variable(input)
         return self.netG(input)
             
-    # def test(self, input):
-    #     """Forward function used in test time.
-
-    #     This function wraps <forward> function in no_grad() so we don't save intermediate steps for backprop
-    #     It also calls <compute_visuals> to produce additional visualization results
-    #     """
-    #     with paddle.imperative.no_grad():
-    #         return self.forward_test(input)
-            
     def backward_D(self):
         """Calculate GAN loss for the discriminator"""
         # Fake; stop backprop to the generator by detaching fake_B
-        fake_AB = paddle.concat((self.real_A, self.fake_B), 1)  # we use conditional GANs; we need to feed both input and output to the discriminator
+        # use conditional GANs; we need to feed both input and output to the discriminator
+        fake_AB = paddle.concat((self.real_A, self.fake_B), 1)
         pred_fake = self.netD(fake_AB.detach())
         self.loss_D_fake = self.criterionGAN(pred_fake, False)
         # Real
@@ -134,16 +114,17 @@ class Pix2PixModel(BaseModel):
         self.loss_G.backward()
 
     def optimize_parameters(self):
-        self.forward()                   # compute fake images: G(A)
+        # compute fake images: G(A)
+        self.forward()
+
         # update D
-        self.set_requires_grad(self.netD, True)  # enable backprop for D
-        self.optimizer_D.clear_gradients()   # set D's gradients to zero
-        self.backward_D()                # calculate gradients for D
-        self.optimizer_D.minimize(self.loss_D)        # update D's weights
-        # self.netD.clear_gradients()
-        # self.optimizer_D.clear_gradients()
+        self.set_requires_grad(self.netD, True)
+        self.optimizer_D.clear_gradients() 
+        self.backward_D()
+        self.optimizer_D.minimize(self.loss_D) 
+       
         # update G
-        self.set_requires_grad(self.netD, False)  # D requires no gradients when optimizing G
-        self.optimizer_G.clear_gradients()       # set G's gradients to zero
-        self.backward_G()                   # calculate graidents for G
-        self.optimizer_G.minimize(self.loss_G)           # udpate G's weights
+        self.set_requires_grad(self.netD, False) 
+        self.optimizer_G.clear_gradients()
+        self.backward_G()
+        self.optimizer_G.minimize(self.loss_G)

script/pix2pix_download.sh

+FILE=$1
+URL=https://people.eecs.berkeley.edu/~tinghuiz/projects/pix2pix/datasets/$FILE.tar.gz
+TAR_FILE=./$FILE.tar.gz
+TARGET_DIR=./$FILE/
+wget -N $URL -O $TAR_FILE --no-check-certificate
+mkdir $TARGET_DIR
+tar -zxvf $TAR_FILE -C ../data/
+rm $TAR_FILE
+rm -rf $TARGET_DIR