Standardize headers and docstrings (#4417)

* Implement new headers

* Reformat 1

* Reformat 2

* Reformat 3 - math

* Reformat 4 - yaml

.github/workflows/ci-testing.yml

@@ -1,11 +1,13 @@
+# YOLOv5 🚀 by Ultralytics, GPL-3.0 license
+
 name: CI CPU testing
 
 on: # https://help.github.com/en/actions/reference/events-that-trigger-workflows
   push:
-    branches: [ master, develop ]
+    branches: [master, develop]
   pull_request:
     # The branches below must be a subset of the branches above
-    branches: [ master, develop ]
+    branches: [master, develop]
 
 jobs:
   cpu-tests:
@@ -14,9 +16,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-latest, macos-latest, windows-latest ]
-        python-version: [ 3.8 ]
-        model: [ 'yolov5s' ]  # models to test
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        python-version: [3.8]
+        model: ['yolov5s']  # models to test
 
     # Timeout: https://stackoverflow.com/a/59076067/4521646
     timeout-minutes: 50

.github/workflows/codeql-analysis.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        language: [ 'python' ]
+        language: ['python']
         # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
         # Learn more:
         # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed

.github/workflows/greetings.yml

@@ -1,6 +1,8 @@
+# YOLOv5 🚀 by Ultralytics, GPL-3.0 license
+
 name: Greetings
 
-on: [ pull_request_target, issues ]
+on: [pull_request_target, issues]
 
 jobs:
   greeting:

.github/workflows/rebase.yml

@@ -3,7 +3,7 @@ name: Automatic Rebase
 
 on:
   issue_comment:
-    types: [ created ]
+    types: [created]
 
 jobs:
   rebase:

.github/workflows/stale.yml

@@ -1,3 +1,5 @@
+# YOLOv5 🚀 by Ultralytics, GPL-3.0 license
+
 name: Close stale issues
 on:
   schedule: