diff --git a/.yapfignore b/.yapfignore
index 3b03168f5976f..17ed5ee527a06 100644
--- a/.yapfignore
+++ b/.yapfignore
@@ -1,8 +1,5 @@
 .git/*
 
-# TODO
-pl_examples/*
-
 # TODO
 pytorch_lightning/*
 
diff --git a/pl_examples/__init__.py b/pl_examples/__init__.py
index 860d8b48d4393..6ad0a4dfc0624 100644
--- a/pl_examples/__init__.py
+++ b/pl_examples/__init__.py
@@ -9,7 +9,6 @@
 _TORCHVISION_AVAILABLE = _module_available("torchvision")
 _DALI_AVAILABLE = _module_available("nvidia.dali")
 
-
 LIGHTNING_LOGO = """
                     ####
                 ###########
diff --git a/pl_examples/basic_examples/autoencoder.py b/pl_examples/basic_examples/autoencoder.py
index e72002824fdbd..3fc46d538d9d6 100644
--- a/pl_examples/basic_examples/autoencoder.py
+++ b/pl_examples/basic_examples/autoencoder.py
@@ -43,12 +43,12 @@ def __init__(self):
         self.encoder = nn.Sequential(
             nn.Linear(28 * 28, 64),
             nn.ReLU(),
-            nn.Linear(64, 3)
+            nn.Linear(64, 3),
         )
         self.decoder = nn.Sequential(
             nn.Linear(3, 64),
             nn.ReLU(),
-            nn.Linear(64, 28 * 28)
+            nn.Linear(64, 28 * 28),
         )
 
     def forward(self, x):
diff --git a/pl_examples/basic_examples/backbone_image_classifier.py b/pl_examples/basic_examples/backbone_image_classifier.py
index 0494610279a95..5ef1301963781 100644
--- a/pl_examples/basic_examples/backbone_image_classifier.py
+++ b/pl_examples/basic_examples/backbone_image_classifier.py
@@ -36,6 +36,7 @@ class Backbone(torch.nn.Module):
       (l2): Linear(...)
     )
     """
+
     def __init__(self, hidden_dim=128):
         super().__init__()
         self.l1 = torch.nn.Linear(28 * 28, hidden_dim)
@@ -55,6 +56,7 @@ class LitClassifier(pl.LightningModule):
       (backbone): ...
     )
     """
+
     def __init__(self, backbone, learning_rate=1e-3):
         super().__init__()
         self.save_hyperparameters()
diff --git a/pl_examples/basic_examples/conv_sequential_example.py b/pl_examples/basic_examples/conv_sequential_example.py
index 38e077071d59e..81de052b3fd0a 100644
--- a/pl_examples/basic_examples/conv_sequential_example.py
+++ b/pl_examples/basic_examples/conv_sequential_example.py
@@ -39,16 +39,17 @@
     import pl_bolts
     from pl_bolts.transforms.dataset_normalizations import cifar10_normalization
 
-
 #####################
 #      Modules      #
 #####################
 
 
 class Flatten(nn.Module):
+
     def forward(self, x):
         return x.view(x.size(0), -1)
 
+
 ###############################
 #       LightningModule       #
 ###############################
@@ -61,6 +62,7 @@ class LitResnet(pl.LightningModule):
       (sequential_module): Sequential(...)
     )
     """
+
     def __init__(self, lr=0.05, batch_size=32, manual_optimization=False):
         super().__init__()
 
@@ -90,9 +92,7 @@ def __init__(self, lr=0.05, batch_size=32, manual_optimization=False):
             nn.Conv2d(in_channels=256, out_channels=256, kernel_size=3, padding=1),
             nn.ReLU(inplace=False),
             nn.MaxPool2d(kernel_size=2, stride=2),
-
             Flatten(),
-
             nn.Dropout(p=0.1),
             nn.Linear(4096, 1024),
             nn.ReLU(inplace=False),
@@ -159,7 +159,8 @@ def configure_optimizers(self):
                     optimizer,
                     0.1,
                     epochs=self.trainer.max_epochs,
-                    steps_per_epoch=math.ceil(45000 / self.hparams.batch_size)),
+                    steps_per_epoch=math.ceil(45000 / self.hparams.batch_size)
+                ),
                 'interval': 'step',
             }
         }
@@ -173,6 +174,7 @@ def automatic_optimization(self) -> bool:
 #     Instantiate Data Module   #
 #################################
 
+
 def instantiate_datamodule(args):
     train_transforms = torchvision.transforms.Compose([
         torchvision.transforms.RandomCrop(32, padding=4),
diff --git a/pl_examples/basic_examples/dali_image_classifier.py b/pl_examples/basic_examples/dali_image_classifier.py
index a598e300b282b..1e47d3b54cdeb 100644
--- a/pl_examples/basic_examples/dali_image_classifier.py
+++ b/pl_examples/basic_examples/dali_image_classifier.py
@@ -95,22 +95,30 @@ class DALIClassificationLoader(DALIClassificationIterator):
     """
 
     def __init__(
-            self,
-            pipelines,
-            size=-1,
-            reader_name=None,
-            auto_reset=False,
-            fill_last_batch=True,
-            dynamic_shape=False,
-            last_batch_padded=False,
+        self,
+        pipelines,
+        size=-1,
+        reader_name=None,
+        auto_reset=False,
+        fill_last_batch=True,
+        dynamic_shape=False,
+        last_batch_padded=False,
     ):
         if NEW_DALI_API:
             last_batch_policy = LastBatchPolicy.FILL if fill_last_batch else LastBatchPolicy.DROP
-            super().__init__(pipelines, size, reader_name, auto_reset, dynamic_shape,
-                             last_batch_policy=last_batch_policy, last_batch_padded=last_batch_padded)
+            super().__init__(
+                pipelines,
+                size,
+                reader_name,
+                auto_reset,
+                dynamic_shape,
+                last_batch_policy=last_batch_policy,
+                last_batch_padded=last_batch_padded
+            )
         else:
-            super().__init__(pipelines, size, reader_name, auto_reset, fill_last_batch,
-                             dynamic_shape, last_batch_padded)
+            super().__init__(
+                pipelines, size, reader_name, auto_reset, fill_last_batch, dynamic_shape, last_batch_padded
+            )
         self._fill_last_batch = fill_last_batch
 
     def __len__(self):
@@ -120,6 +128,7 @@ def __len__(self):
 
 
 class LitClassifier(pl.LightningModule):
+
     def __init__(self, hidden_dim=128, learning_rate=1e-3):
         super().__init__()
         self.save_hyperparameters()
diff --git a/pl_examples/basic_examples/mnist_datamodule.py b/pl_examples/basic_examples/mnist_datamodule.py
index 8a607c2d1a0c7..09de77cceb851 100644
--- a/pl_examples/basic_examples/mnist_datamodule.py
+++ b/pl_examples/basic_examples/mnist_datamodule.py
@@ -58,8 +58,10 @@ def __init__(
         super().__init__(*args, **kwargs)
         if num_workers and platform.system() == "Windows":
             # see: https://stackoverflow.com/a/59680818
-            warn(f"You have requested num_workers={num_workers} on Windows,"
-                 " but currently recommended is 0, so we set it for you")
+            warn(
+                f"You have requested num_workers={num_workers} on Windows,"
+                " but currently recommended is 0, so we set it for you"
+            )
             num_workers = 0
 
         self.dims = (1, 28, 28)
@@ -132,9 +134,9 @@ def default_transforms(self):
         if not _TORCHVISION_AVAILABLE:
             return None
         if self.normalize:
-            mnist_transforms = transform_lib.Compose(
-                [transform_lib.ToTensor(), transform_lib.Normalize(mean=(0.5,), std=(0.5,))]
-            )
+            mnist_transforms = transform_lib.Compose([
+                transform_lib.ToTensor(), transform_lib.Normalize(mean=(0.5, ), std=(0.5, ))
+            ])
         else:
             mnist_transforms = transform_lib.ToTensor()
 
diff --git a/pl_examples/basic_examples/simple_image_classifier.py b/pl_examples/basic_examples/simple_image_classifier.py
index 894eeea619ba9..b0b03446f3628 100644
--- a/pl_examples/basic_examples/simple_image_classifier.py
+++ b/pl_examples/basic_examples/simple_image_classifier.py
@@ -31,6 +31,7 @@ class LitClassifier(pl.LightningModule):
       (l2): Linear(...)
     )
     """
+
     def __init__(self, hidden_dim=128, learning_rate=1e-3):
         super().__init__()
         self.save_hyperparameters()
diff --git a/pl_examples/bug_report_model.py b/pl_examples/bug_report_model.py
index 1351048711df4..4d9a23f48ca5d 100644
--- a/pl_examples/bug_report_model.py
+++ b/pl_examples/bug_report_model.py
@@ -33,6 +33,7 @@ class RandomDataset(Dataset):
     >>> RandomDataset(size=10, length=20)  # doctest: +ELLIPSIS
     <...bug_report_model.RandomDataset object at ...>
     """
+
     def __init__(self, size, length):
         self.len = length
         self.data = torch.randn(length, size)
@@ -124,9 +125,11 @@ def configure_optimizers(self):
 #  parser = ArgumentParser()
 #  args = parser.parse_args(opt)
 
+
 def test_run():
 
     class TestModel(BoringModel):
+
         def on_train_epoch_start(self) -> None:
             print('override any method to prove your bug')
 
diff --git a/pl_examples/domain_templates/computer_vision_fine_tuning.py b/pl_examples/domain_templates/computer_vision_fine_tuning.py
index abb7bbb04a6e0..9702253b4740b 100644
--- a/pl_examples/domain_templates/computer_vision_fine_tuning.py
+++ b/pl_examples/domain_templates/computer_vision_fine_tuning.py
@@ -1,4 +1,3 @@
-
 # Copyright The PyTorch Lightning team.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -60,14 +59,12 @@
 
 DATA_URL = "https://storage.googleapis.com/mledu-datasets/cats_and_dogs_filtered.zip"
 
-
 #  --- Finetunning Callback ---
 
+
 class MilestonesFinetuningCallback(BaseFinetuningCallback):
 
-    def __init__(self,
-                 milestones: tuple = (5, 10),
-                 train_bn: bool = True):
+    def __init__(self, milestones: tuple = (5, 10), train_bn: bool = True):
         self.milestones = milestones
         self.train_bn = train_bn
 
@@ -78,17 +75,13 @@ def finetunning_function(self, pl_module: pl.LightningModule, epoch: int, optimi
         if epoch == self.milestones[0]:
             # unfreeze 5 last layers
             self.unfreeze_and_add_param_group(
-                module=pl_module.feature_extractor[-5:],
-                optimizer=optimizer,
-                train_bn=self.train_bn
+                module=pl_module.feature_extractor[-5:], optimizer=optimizer, train_bn=self.train_bn
             )
 
         elif epoch == self.milestones[1]:
             # unfreeze remaing layers
             self.unfreeze_and_add_param_group(
-                module=pl_module.feature_extractor[:-5],
-                optimizer=optimizer,
-                train_bn=self.train_bn
+                module=pl_module.feature_extractor[:-5], optimizer=optimizer, train_bn=self.train_bn
             )
 
 
@@ -149,10 +142,12 @@ def __build_model(self):
         self.feature_extractor = nn.Sequential(*_layers)
 
         # 2. Classifier:
-        _fc_layers = [nn.Linear(2048, 256),
-                      nn.ReLU(),
-                      nn.Linear(256, 32),
-                      nn.Linear(32, 1)]
+        _fc_layers = [
+            nn.Linear(2048, 256),
+            nn.ReLU(),
+            nn.Linear(256, 32),
+            nn.Linear(32, 1),
+        ]
         self.fc = nn.Sequential(*_fc_layers)
 
         # 3. Loss:
@@ -218,25 +213,21 @@ def setup(self, stage: str):
 
         train_dataset = ImageFolder(
             root=data_path.joinpath("train"),
-            transform=transforms.Compose(
-                [
-                    transforms.Resize((224, 224)),
-                    transforms.RandomHorizontalFlip(),
-                    transforms.ToTensor(),
-                    normalize,
-                ]
-            ),
+            transform=transforms.Compose([
+                transforms.Resize((224, 224)),
+                transforms.RandomHorizontalFlip(),
+                transforms.ToTensor(),
+                normalize,
+            ]),
         )
 
         valid_dataset = ImageFolder(
             root=data_path.joinpath("validation"),
-            transform=transforms.Compose(
-                [
-                    transforms.Resize((224, 224)),
-                    transforms.ToTensor(),
-                    normalize,
-                ]
-            ),
+            transform=transforms.Compose([
+                transforms.Resize((224, 224)),
+                transforms.ToTensor(),
+                normalize,
+            ]),
         )
 
         self.train_dataset = train_dataset
diff --git a/pl_examples/domain_templates/generative_adversarial_net.py b/pl_examples/domain_templates/generative_adversarial_net.py
index 35b5563d2c1cc..e4a9b15dbdb40 100644
--- a/pl_examples/domain_templates/generative_adversarial_net.py
+++ b/pl_examples/domain_templates/generative_adversarial_net.py
@@ -43,6 +43,7 @@ class Generator(nn.Module):
       (model): Sequential(...)
     )
     """
+
     def __init__(self, latent_dim: int = 100, img_shape: tuple = (1, 28, 28)):
         super().__init__()
         self.img_shape = img_shape
@@ -60,7 +61,7 @@ def block(in_feat, out_feat, normalize=True):
             *block(256, 512),
             *block(512, 1024),
             nn.Linear(1024, int(np.prod(img_shape))),
-            nn.Tanh()
+            nn.Tanh(),
         )
 
     def forward(self, z):
@@ -76,6 +77,7 @@ class Discriminator(nn.Module):
       (model): Sequential(...)
     )
     """
+
     def __init__(self, img_shape):
         super().__init__()
 
@@ -106,13 +108,14 @@ class GAN(LightningModule):
       )
     )
     """
+
     def __init__(
-            self,
-            img_shape: tuple = (1, 28, 28),
-            lr: float = 0.0002,
-            b1: float = 0.5,
-            b2: float = 0.999,
-            latent_dim: int = 100,
+        self,
+        img_shape: tuple = (1, 28, 28),
+        lr: float = 0.0002,
+        b1: float = 0.5,
+        b2: float = 0.999,
+        latent_dim: int = 100,
     ):
         super().__init__()
 
@@ -130,12 +133,9 @@ def __init__(
     def add_argparse_args(parent_parser: ArgumentParser):
         parser = ArgumentParser(parents=[parent_parser], add_help=False)
         parser.add_argument("--lr", type=float, default=0.0002, help="adam: learning rate")
-        parser.add_argument("--b1", type=float, default=0.5,
-                            help="adam: decay of first order momentum of gradient")
-        parser.add_argument("--b2", type=float, default=0.999,
-                            help="adam: decay of second order momentum of gradient")
-        parser.add_argument("--latent_dim", type=int, default=100,
-                            help="dimensionality of the latent space")
+        parser.add_argument("--b1", type=float, default=0.5, help="adam: decay of first order momentum of gradient")
+        parser.add_argument("--b2", type=float, default=0.999, help="adam: decay of second order momentum of gradient")
+        parser.add_argument("--latent_dim", type=int, default=100, help="dimensionality of the latent space")
 
         return parser
 
@@ -180,8 +180,7 @@ def training_step(self, batch, batch_idx, optimizer_idx):
             fake = torch.zeros(imgs.size(0), 1)
             fake = fake.type_as(imgs)
 
-            fake_loss = self.adversarial_loss(
-                self.discriminator(self(z).detach()), fake)
+            fake_loss = self.adversarial_loss(self.discriminator(self(z).detach()), fake)
 
             # discriminator loss is the average of these
             d_loss = (real_loss + fake_loss) / 2
@@ -213,14 +212,14 @@ class MNISTDataModule(LightningDataModule):
     >>> MNISTDataModule()  # doctest: +ELLIPSIS
     <...generative_adversarial_net.MNISTDataModule object at ...>
     """
+
     def __init__(self, batch_size: int = 64, data_path: str = os.getcwd(), num_workers: int = 4):
         super().__init__()
         self.batch_size = batch_size
         self.data_path = data_path
         self.num_workers = num_workers
 
-        self.transform = transforms.Compose([transforms.ToTensor(),
-                                             transforms.Normalize([0.5], [0.5])])
+        self.transform = transforms.Compose([transforms.ToTensor(), transforms.Normalize([0.5], [0.5])])
         self.dims = (1, 28, 28)
 
     def prepare_data(self, stage=None):
diff --git a/pl_examples/domain_templates/imagenet.py b/pl_examples/domain_templates/imagenet.py
index cc36f3542a1c8..35357fe291e8a 100644
--- a/pl_examples/domain_templates/imagenet.py
+++ b/pl_examples/domain_templates/imagenet.py
@@ -63,16 +63,16 @@ class ImageNetLightningModel(LightningModule):
     )
 
     def __init__(
-            self,
-            data_path: str,
-            arch: str = 'resnet18',
-            pretrained: bool = False,
-            lr: float = 0.1,
-            momentum: float = 0.9,
-            weight_decay: float = 1e-4,
-            batch_size: int = 4,
-            workers: int = 2,
-            **kwargs,
+        self,
+        data_path: str,
+        arch: str = 'resnet18',
+        pretrained: bool = False,
+        lr: float = 0.1,
+        momentum: float = 0.9,
+        weight_decay: float = 1e-4,
+        batch_size: int = 4,
+        workers: int = 2,
+        **kwargs,
     ):
         super().__init__()
         self.save_hyperparameters()
@@ -109,7 +109,7 @@ def validation_step(self, batch, batch_idx):
         self.log('val_acc5', acc5, on_step=True, on_epoch=True)
 
     @staticmethod
-    def __accuracy(output, target, topk=(1,)):
+    def __accuracy(output, target, topk=(1, )):
         """Computes the accuracy over the k top predictions for the specified values of k"""
         with torch.no_grad():
             maxk = max(topk)
@@ -126,16 +126,8 @@ def __accuracy(output, target, topk=(1,)):
             return res
 
     def configure_optimizers(self):
-        optimizer = optim.SGD(
-            self.parameters(),
-            lr=self.lr,
-            momentum=self.momentum,
-            weight_decay=self.weight_decay
-        )
-        scheduler = lr_scheduler.LambdaLR(
-            optimizer,
-            lambda epoch: 0.1 ** (epoch // 30)
-        )
+        optimizer = optim.SGD(self.parameters(), lr=self.lr, momentum=self.momentum, weight_decay=self.weight_decay)
+        scheduler = lr_scheduler.LambdaLR(optimizer, lambda epoch: 0.1**(epoch // 30))
         return [optimizer], [scheduler]
 
     def train_dataloader(self):
@@ -152,7 +144,8 @@ def train_dataloader(self):
                 transforms.RandomHorizontalFlip(),
                 transforms.ToTensor(),
                 normalize,
-            ]))
+            ])
+        )
 
         train_loader = torch.utils.data.DataLoader(
             dataset=train_dataset,
@@ -169,12 +162,15 @@ def val_dataloader(self):
         )
         val_dir = os.path.join(self.data_path, 'val')
         val_loader = torch.utils.data.DataLoader(
-            datasets.ImageFolder(val_dir, transforms.Compose([
-                transforms.Resize(256),
-                transforms.CenterCrop(224),
-                transforms.ToTensor(),
-                normalize,
-            ])),
+            datasets.ImageFolder(
+                val_dir,
+                transforms.Compose([
+                    transforms.Resize(256),
+                    transforms.CenterCrop(224),
+                    transforms.ToTensor(),
+                    normalize,
+                ])
+            ),
             batch_size=self.batch_size,
             shuffle=False,
             num_workers=self.workers,
@@ -203,26 +199,40 @@ def substitute_val_keys(out):
     @staticmethod
     def add_model_specific_args(parent_parser):  # pragma: no-cover
         parser = ArgumentParser(parents=[parent_parser])
-        parser.add_argument('-a', '--arch', metavar='ARCH', default='resnet18',
-                            choices=ImageNetLightningModel.MODEL_NAMES,
-                            help=('model architecture: ' + ' | '.join(ImageNetLightningModel.MODEL_NAMES)
-                                  + ' (default: resnet18)'))
-        parser.add_argument('-j', '--workers', default=4, type=int, metavar='N',
-                            help='number of data loading workers (default: 4)')
-        parser.add_argument('-b', '--batch-size', default=256, type=int,
-                            metavar='N',
-                            help='mini-batch size (default: 256), this is the total '
-                                 'batch size of all GPUs on the current node when '
-                                 'using Data Parallel or Distributed Data Parallel')
-        parser.add_argument('--lr', '--learning-rate', default=0.1, type=float,
-                            metavar='LR', help='initial learning rate', dest='lr')
-        parser.add_argument('--momentum', default=0.9, type=float, metavar='M',
-                            help='momentum')
-        parser.add_argument('--wd', '--weight-decay', default=1e-4, type=float,
-                            metavar='W', help='weight decay (default: 1e-4)',
-                            dest='weight_decay')
-        parser.add_argument('--pretrained', dest='pretrained', action='store_true',
-                            help='use pre-trained model')
+        parser.add_argument(
+            '-a',
+            '--arch',
+            metavar='ARCH',
+            default='resnet18',
+            choices=ImageNetLightningModel.MODEL_NAMES,
+            help=('model architecture: ' + ' | '.join(ImageNetLightningModel.MODEL_NAMES) + ' (default: resnet18)')
+        )
+        parser.add_argument(
+            '-j', '--workers', default=4, type=int, metavar='N', help='number of data loading workers (default: 4)'
+        )
+        parser.add_argument(
+            '-b',
+            '--batch-size',
+            default=256,
+            type=int,
+            metavar='N',
+            help='mini-batch size (default: 256), this is the total batch size of all GPUs on the current node'
+            ' when using Data Parallel or Distributed Data Parallel'
+        )
+        parser.add_argument(
+            '--lr', '--learning-rate', default=0.1, type=float, metavar='LR', help='initial learning rate', dest='lr'
+        )
+        parser.add_argument('--momentum', default=0.9, type=float, metavar='M', help='momentum')
+        parser.add_argument(
+            '--wd',
+            '--weight-decay',
+            default=1e-4,
+            type=float,
+            metavar='W',
+            help='weight decay (default: 1e-4)',
+            dest='weight_decay'
+        )
+        parser.add_argument('--pretrained', dest='pretrained', action='store_true', help='use pre-trained model')
         return parser
 
 
@@ -249,12 +259,11 @@ def main(args: Namespace) -> None:
 def run_cli():
     parent_parser = ArgumentParser(add_help=False)
     parent_parser = pl.Trainer.add_argparse_args(parent_parser)
-    parent_parser.add_argument('--data-path', metavar='DIR', type=str,
-                               help='path to dataset')
-    parent_parser.add_argument('-e', '--evaluate', dest='evaluate', action='store_true',
-                               help='evaluate model on validation set')
-    parent_parser.add_argument('--seed', type=int, default=42,
-                               help='seed for initializing training.')
+    parent_parser.add_argument('--data-path', metavar='DIR', type=str, help='path to dataset')
+    parent_parser.add_argument(
+        '-e', '--evaluate', dest='evaluate', action='store_true', help='evaluate model on validation set'
+    )
+    parent_parser.add_argument('--seed', type=int, default=42, help='seed for initializing training.')
     parser = ImageNetLightningModel.add_model_specific_args(parent_parser)
     parser.set_defaults(
         profiler="simple",
diff --git a/pl_examples/domain_templates/reinforce_learn_Qnet.py b/pl_examples/domain_templates/reinforce_learn_Qnet.py
index 21583dad1f086..7a0aaef34a0e7 100644
--- a/pl_examples/domain_templates/reinforce_learn_Qnet.py
+++ b/pl_examples/domain_templates/reinforce_learn_Qnet.py
@@ -70,7 +70,7 @@ def __init__(self, obs_size: int, n_actions: int, hidden_size: int = 128):
         self.net = nn.Sequential(
             nn.Linear(obs_size, hidden_size),
             nn.ReLU(),
-            nn.Linear(hidden_size, n_actions)
+            nn.Linear(hidden_size, n_actions),
         )
 
     def forward(self, x):
@@ -78,9 +78,7 @@ def forward(self, x):
 
 
 # Named tuple for storing experience steps gathered in training
-Experience = namedtuple(
-    'Experience', field_names=['state', 'action', 'reward',
-                               'done', 'new_state'])
+Experience = namedtuple('Experience', field_names=['state', 'action', 'reward', 'done', 'new_state'])
 
 
 class ReplayBuffer:
@@ -114,8 +112,13 @@ def sample(self, batch_size: int) -> Tuple:
         indices = np.random.choice(len(self.buffer), batch_size, replace=False)
         states, actions, rewards, dones, next_states = zip(*[self.buffer[idx] for idx in indices])
 
-        return (np.array(states), np.array(actions), np.array(rewards, dtype=np.float32),
-                np.array(dones, dtype=np.bool), np.array(next_states))
+        return (
+            np.array(states),
+            np.array(actions),
+            np.array(rewards, dtype=np.float32),
+            np.array(dones, dtype=np.bool),
+            np.array(next_states),
+        )
 
 
 class RLDataset(IterableDataset):
@@ -236,20 +239,21 @@ class DQNLightning(pl.LightningModule):
       )
     )
     """
+
     def __init__(
-            self,
-            env: str,
-            replay_size: int = 200,
-            warm_start_steps: int = 200,
-            gamma: float = 0.99,
-            eps_start: float = 1.0,
-            eps_end: float = 0.01,
-            eps_last_frame: int = 200,
-            sync_rate: int = 10,
-            lr: float = 1e-2,
-            episode_length: int = 50,
-            batch_size: int = 4,
-            **kwargs,
+        self,
+        env: str,
+        replay_size: int = 200,
+        warm_start_steps: int = 200,
+        gamma: float = 0.99,
+        eps_start: float = 1.0,
+        eps_end: float = 0.01,
+        eps_last_frame: int = 200,
+        sync_rate: int = 10,
+        lr: float = 1e-2,
+        episode_length: int = 50,
+        batch_size: int = 4,
+        **kwargs,
     ) -> None:
         super().__init__(**kwargs)
         self.replay_size = replay_size
@@ -353,9 +357,11 @@ def training_step(self, batch: Tuple[torch.Tensor, torch.Tensor], nb_batch) -> O
         if self.global_step % self.sync_rate == 0:
             self.target_net.load_state_dict(self.net.state_dict())
 
-        log = {'total_reward': torch.tensor(self.total_reward).to(device),
-               'reward': torch.tensor(reward).to(device),
-               'steps': torch.tensor(self.global_step).to(device)}
+        log = {
+            'total_reward': torch.tensor(self.total_reward).to(device),
+            'reward': torch.tensor(reward).to(device),
+            'steps': torch.tensor(self.global_step).to(device)
+        }
 
         return OrderedDict({'loss': loss, 'log': log, 'progress_bar': log})
 
@@ -389,21 +395,20 @@ def add_model_specific_args(parent_parser):  # pragma: no-cover
         parser.add_argument("--lr", type=float, default=1e-2, help="learning rate")
         parser.add_argument("--env", type=str, default="CartPole-v0", help="gym environment tag")
         parser.add_argument("--gamma", type=float, default=0.99, help="discount factor")
-        parser.add_argument("--sync_rate", type=int, default=10,
-                            help="how many frames do we update the target network")
-        parser.add_argument("--replay_size", type=int, default=1000,
-                            help="capacity of the replay buffer")
-        parser.add_argument("--warm_start_size", type=int, default=1000,
-                            help="how many samples do we use to fill our buffer at the start of training")
-        parser.add_argument("--eps_last_frame", type=int, default=1000,
-                            help="what frame should epsilon stop decaying")
+        parser.add_argument("--sync_rate", type=int, default=10, help="how many frames do we update the target network")
+        parser.add_argument("--replay_size", type=int, default=1000, help="capacity of the replay buffer")
+        parser.add_argument(
+            "--warm_start_size",
+            type=int,
+            default=1000,
+            help="how many samples do we use to fill our buffer at the start of training"
+        )
+        parser.add_argument("--eps_last_frame", type=int, default=1000, help="what frame should epsilon stop decaying")
         parser.add_argument("--eps_start", type=float, default=1.0, help="starting value of epsilon")
         parser.add_argument("--eps_end", type=float, default=0.01, help="final value of epsilon")
         parser.add_argument("--episode_length", type=int, default=200, help="max length of an episode")
-        parser.add_argument("--max_episode_reward", type=int, default=200,
-                            help="max episode reward in the environment")
-        parser.add_argument("--warm_start_steps", type=int, default=1000,
-                            help="max episode reward in the environment")
+        parser.add_argument("--max_episode_reward", type=int, default=200, help="max episode reward in the environment")
+        parser.add_argument("--warm_start_steps", type=int, default=1000, help="max episode reward in the environment")
         return parser
 
 
@@ -413,7 +418,7 @@ def main(args) -> None:
     trainer = pl.Trainer(
         gpus=1,
         accelerator='dp',
-        val_check_interval=100
+        val_check_interval=100,
     )
 
     trainer.fit(model)
diff --git a/pl_examples/domain_templates/reinforce_learn_ppo.py b/pl_examples/domain_templates/reinforce_learn_ppo.py
index 86b7ba2fa5248..026784f900622 100644
--- a/pl_examples/domain_templates/reinforce_learn_ppo.py
+++ b/pl_examples/domain_templates/reinforce_learn_ppo.py
@@ -50,7 +50,7 @@ def create_mlp(input_shape: Tuple[int], n_actions: int, hidden_size: int = 128):
         nn.ReLU(),
         nn.Linear(hidden_size, hidden_size),
         nn.ReLU(),
-        nn.Linear(hidden_size, n_actions)
+        nn.Linear(hidden_size, n_actions),
     )
 
     return network
@@ -159,6 +159,7 @@ class PPOLightning(pl.LightningModule):
         trainer = Trainer()
         trainer.fit(model)
     """
+
     def __init__(
         self,
         env: str,
@@ -173,7 +174,6 @@ def __init__(
         clip_ratio: float = 0.2,
         **kwargs,
     ) -> None:
-
         """
         Args:
             env: gym environment tag
@@ -213,8 +213,10 @@ def __init__(
             actor_mlp = create_mlp(self.env.observation_space.shape, self.env.action_space.n)
             self.actor = ActorCategorical(actor_mlp)
         else:
-            raise NotImplementedError('Env action space should be of type Box (continous) or Discrete (categorical). '
-                                      f'Got type: {type(self.env.action_space)}')
+            raise NotImplementedError(
+                'Env action space should be of type Box (continous) or Discrete (categorical).'
+                f' Got type: {type(self.env.action_space)}'
+            )
 
         self.batch_states = []
         self.batch_actions = []
@@ -287,9 +289,7 @@ def calc_advantage(self, rewards: List[float], values: List[float], last_value:
 
         return adv
 
-    def generate_trajectory_samples(
-            self,
-    ) -> Tuple[List[torch.Tensor], List[torch.Tensor], List[torch.Tensor]]:
+    def generate_trajectory_samples(self) -> Tuple[List[torch.Tensor], List[torch.Tensor], List[torch.Tensor]]:
         """
         Contains the logic for generating trajectory data to train policy and value network
         Yield:
@@ -345,8 +345,8 @@ def generate_trajectory_samples(
 
             if epoch_end:
                 train_data = zip(
-                    self.batch_states, self.batch_actions, self.batch_logp,
-                    self.batch_qvals, self.batch_adv)
+                    self.batch_states, self.batch_actions, self.batch_logp, self.batch_qvals, self.batch_adv
+                )
 
                 for state, action, logp_old, qval, adv in train_data:
                     yield state, action, logp_old, qval, adv
@@ -454,12 +454,18 @@ def add_model_specific_args(parent_parser):  # pragma: no-cover
         parser.add_argument("--lr_critic", type=float, default=1e-3, help="learning rate of critic network")
         parser.add_argument("--max_episode_len", type=int, default=1000, help="capacity of the replay buffer")
         parser.add_argument("--batch_size", type=int, default=512, help="batch_size when training network")
-        parser.add_argument("--steps_per_epoch", type=int, default=2048,
-                            help="how many action-state pairs to rollout for trajectory collection per epoch")
-        parser.add_argument("--nb_optim_iters", type=int, default=4,
-                            help="how many steps of gradient descent to perform on each batch")
-        parser.add_argument("--clip_ratio", type=float, default=0.2,
-                            help="hyperparameter for clipping in the policy objective")
+        parser.add_argument(
+            "--steps_per_epoch",
+            type=int,
+            default=2048,
+            help="how many action-state pairs to rollout for trajectory collection per epoch"
+        )
+        parser.add_argument(
+            "--nb_optim_iters", type=int, default=4, help="how many steps of gradient descent to perform on each batch"
+        )
+        parser.add_argument(
+            "--clip_ratio", type=float, default=0.2, help="hyperparameter for clipping in the policy objective"
+        )
 
         return parser
 
diff --git a/pl_examples/domain_templates/semantic_segmentation.py b/pl_examples/domain_templates/semantic_segmentation.py
index 507efc78e0f8d..06f4489c7c9dc 100644
--- a/pl_examples/domain_templates/semantic_segmentation.py
+++ b/pl_examples/domain_templates/semantic_segmentation.py
@@ -178,15 +178,16 @@ class SegModel(pl.LightningModule):
       )
     )
     """
+
     def __init__(
-            self,
-            data_path: str,
-            batch_size: int = 4,
-            lr: float = 1e-3,
-            num_layers: int = 3,
-            features_start: int = 64,
-            bilinear: bool = False,
-            **kwargs,
+        self,
+        data_path: str,
+        batch_size: int = 4,
+        lr: float = 1e-3,
+        num_layers: int = 3,
+        features_start: int = 64,
+        bilinear: bool = False,
+        **kwargs,
     ):
         super().__init__(**kwargs)
         self.data_path = data_path
@@ -196,12 +197,12 @@ def __init__(
         self.features_start = features_start
         self.bilinear = bilinear
 
-        self.net = UNet(num_classes=19, num_layers=self.num_layers,
-                        features_start=self.features_start, bilinear=self.bilinear)
+        self.net = UNet(
+            num_classes=19, num_layers=self.num_layers, features_start=self.features_start, bilinear=self.bilinear
+        )
         self.transform = transforms.Compose([
             transforms.ToTensor(),
-            transforms.Normalize(mean=[0.35675976, 0.37380189, 0.3764753],
-                                 std=[0.32064945, 0.32098866, 0.32325324])
+            transforms.Normalize(mean=[0.35675976, 0.37380189, 0.3764753], std=[0.32064945, 0.32098866, 0.32325324])
         ])
         self.trainset = KITTI(self.data_path, split='train', transform=self.transform)
         self.validset = KITTI(self.data_path, split='valid', transform=self.transform)
@@ -250,8 +251,12 @@ def add_model_specific_args(parent_parser):  # pragma: no-cover
         parser.add_argument("--lr", type=float, default=0.001, help="adam: learning rate")
         parser.add_argument("--num_layers", type=int, default=5, help="number of layers on u-net")
         parser.add_argument("--features_start", type=float, default=64, help="number of features in first layer")
-        parser.add_argument("--bilinear", action='store_true', default=False,
-                            help="whether to use bilinear interpolation or transposed")
+        parser.add_argument(
+            "--bilinear",
+            action='store_true',
+            default=False,
+            help="whether to use bilinear interpolation or transposed"
+        )
         return parser
 
 
diff --git a/pl_examples/domain_templates/unet.py b/pl_examples/domain_templates/unet.py
index 2314e19ddbfc9..f083ae434bd33 100644
--- a/pl_examples/domain_templates/unet.py
+++ b/pl_examples/domain_templates/unet.py
@@ -36,11 +36,11 @@ class UNet(nn.Module):
     """
 
     def __init__(
-            self,
-            num_classes: int = 19,
-            num_layers: int = 5,
-            features_start: int = 64,
-            bilinear: bool = False,
+        self,
+        num_classes: int = 19,
+        num_layers: int = 5,
+        features_start: int = 64,
+        bilinear: bool = False,
     ):
         """
         Args:
@@ -97,7 +97,7 @@ def __init__(self, in_ch: int, out_ch: int):
             nn.ReLU(inplace=True),
             nn.Conv2d(out_ch, out_ch, kernel_size=3, padding=1),
             nn.BatchNorm2d(out_ch),
-            nn.ReLU(inplace=True)
+            nn.ReLU(inplace=True),
         )
 
     def forward(self, x):
@@ -121,10 +121,7 @@ class Down(nn.Module):
 
     def __init__(self, in_ch: int, out_ch: int):
         super().__init__()
-        self.net = nn.Sequential(
-            nn.MaxPool2d(kernel_size=2, stride=2),
-            DoubleConv(in_ch, out_ch)
-        )
+        self.net = nn.Sequential(nn.MaxPool2d(kernel_size=2, stride=2), DoubleConv(in_ch, out_ch))
 
     def forward(self, x):
         return self.net(x)
diff --git a/pl_examples/test_examples.py b/pl_examples/test_examples.py
index 5f92399671b37..96fca5bd2042e 100644
--- a/pl_examples/test_examples.py
+++ b/pl_examples/test_examples.py
@@ -53,11 +53,13 @@
 """
 
 
-@pytest.mark.parametrize('import_cli', [
-    'pl_examples.basic_examples.simple_image_classifier',
-    'pl_examples.basic_examples.backbone_image_classifier',
-    'pl_examples.basic_examples.autoencoder',
-])
+@pytest.mark.parametrize(
+    'import_cli', [
+        'pl_examples.basic_examples.simple_image_classifier',
+        'pl_examples.basic_examples.backbone_image_classifier',
+        'pl_examples.basic_examples.autoencoder',
+    ]
+)
 @pytest.mark.skipif(torch.cuda.device_count() < 2, reason="test requires multi-GPU machine")
 @pytest.mark.parametrize('cli_args', [ARGS_DP, ARGS_DP_AMP])
 def test_examples_dp(tmpdir, import_cli, cli_args):
@@ -88,11 +90,13 @@ def test_examples_dp(tmpdir, import_cli, cli_args):
 #         module.cli_main()
 
 
-@pytest.mark.parametrize('import_cli', [
-    'pl_examples.basic_examples.simple_image_classifier',
-    'pl_examples.basic_examples.backbone_image_classifier',
-    'pl_examples.basic_examples.autoencoder',
-])
+@pytest.mark.parametrize(
+    'import_cli', [
+        'pl_examples.basic_examples.simple_image_classifier',
+        'pl_examples.basic_examples.backbone_image_classifier',
+        'pl_examples.basic_examples.autoencoder',
+    ]
+)
 @pytest.mark.parametrize('cli_args', [ARGS_DEFAULT])
 def test_examples_cpu(tmpdir, import_cli, cli_args):