Update pre-commit hook config (#200)

* update pre-commit hook config

* update the contributing guide

.pre-commit-config.yaml

 exclude: ^tests/data/
 repos:
+- repo: https://gitlab.com/pycqa/flake8
+  rev: 3.7.9
+  hooks:
+    - id: flake8
 - repo: https://github.com/asottile/seed-isort-config
-  rev: v1.9.3
+  rev: v2.1.0
   hooks:
-      - id: seed-isort-config
-- repo: https://github.com/pre-commit/mirrors-isort
-  rev: v4.3.21
+    - id: seed-isort-config
+- repo: https://github.com/timothycrosley/isort
+  rev: 4.3.21
   hooks:
       - id: isort
 - repo: https://github.com/pre-commit/mirrors-yapf
@@ -13,10 +17,12 @@ repos:
   hooks:
     - id: yapf
 - repo: https://github.com/pre-commit/pre-commit-hooks
-  rev: v2.3.0
+  rev: v2.5.0
   hooks:
-    - id: flake8
     - id: trailing-whitespace
     - id: check-yaml
     - id: end-of-file-fixer
     - id: requirements-txt-fixer
+    - id: double-quote-string-fixer
+    - id: fix-encoding-pragma
+      args: ["--remove"]

CONTRIBUTING.md

-# Contributing to mmcv
+# Contributing to MMCV
 
 All kinds of contributions are welcome, including but not limited to the following.
 
@@ -7,7 +7,7 @@ All kinds of contributions are welcome, including but not limited to the followi
 
 ## Workflow
 
-1. fork and pull the latest mmcv
+1. fork and pull the latest MMCV
 2. checkout a new branch (do not use master branch for PRs)
 3. commit your changes
 4. create a PR
@@ -24,7 +24,25 @@ We use the following tools for linting and formatting:
 - [yapf](https://github.com/google/yapf): formatter
 - [isort](https://github.com/timothycrosley/isort): sort imports
 
-Style configurations of yapf and isort can be found in [.style.yapf](.style.yapf) and [.isort.cfg](.isort.cfg).
+Style configurations of yapf and isort can be found in [setup.cfg](./setup.cfg).
+
+We use [pre-commit hook](https://pre-commit.com/) that checks and formats for `flake8`, `yapf`, `isort`, `trailing whitespaces`,
+ fixes `end-of-files`, sorts `requirments.txt` automatically on every commit.
+The config for a pre-commit hook is stored in [.pre-commit-config](./.pre-commit-config.yaml).
+
+After you clone the repository, you will need to install initialize pre-commit hook.
+
+```
+pip install -U pre-commit
+```
+
+From the repository folder
+```
+pre-commit install
+```
+
+After this on every commit check code linters and formatter will be enforced.
+
 
 >Before you create a PR, make sure that your code lints and is formatted by yapf.
 

docs/conf.py

-# -*- coding: utf-8 -*-
 #
 # Configuration file for the Sphinx documentation builder.
 #

mmcv/cnn/resnet.py

@@ -9,7 +9,7 @@ from .weight_init import constant_init, kaiming_init
 
 
 def conv3x3(in_planes, out_planes, stride=1, dilation=1):
-    "3x3 convolution with padding"
+    """3x3 convolution with padding"""
     return nn.Conv2d(
         in_planes,
         out_planes,

mmcv/cnn/vgg.py

@@ -8,7 +8,7 @@ from .weight_init import constant_init, kaiming_init, normal_init
 
 
 def conv3x3(in_planes, out_planes, dilation=1):
-    "3x3 convolution with padding"
+    """3x3 convolution with padding"""
     return nn.Conv2d(
         in_planes,
         out_planes,

mmcv/parallel/collate.py

@@ -21,7 +21,7 @@ def collate(batch, samples_per_gpu=1):
     """
 
     if not isinstance(batch, collections.Sequence):
-        raise TypeError("{} is not supported.".format(batch.dtype))
+        raise TypeError('{} is not supported.'.format(batch.dtype))
 
     if isinstance(batch[0], DataContainer):
         assert len(batch) % samples_per_gpu == 0

mmcv/runner/__init__.py

@@ -2,7 +2,7 @@
 from .checkpoint import (_load_checkpoint, load_checkpoint, load_state_dict,
                          save_checkpoint, weights_to_cpu)
 from .dist_utils import get_dist_info, init_dist, master_only
-from .hooks import (CheckpointHook, ClosureHook, DistSamplerSeedHook, HOOKS,
+from .hooks import (HOOKS, CheckpointHook, ClosureHook, DistSamplerSeedHook,
                     Hook, IterTimerHook, LoggerHook, LrUpdaterHook,
                     OptimizerHook, PaviLoggerHook, TensorboardLoggerHook,
                     TextLoggerHook, WandbLoggerHook)

tests/test_runner.py

@@ -53,7 +53,7 @@ def test_wandb_hook():
         model=model,
         batch_processor=lambda model, x, **kwargs: {
             'log_vars': {
-                "accuracy": 0.98
+                'accuracy': 0.98
             },
             'num_samples': 5
         })