Add `user_config_dir('Ultralytics')` (#4715)

* Add `user_config_dir`

* Linux to .config

utils/general.py

@@ -103,6 +103,15 @@ def get_latest_run(search_dir='.'):
     return max(last_list, key=os.path.getctime) if last_list else ''
 
 
+def user_config_dir(dir='Ultralytics'):
+    # Return path of user configuration directory (make if necessary)
+    settings = {'Windows': 'AppData/Roaming', 'Linux': '.config', 'Darwin': 'Library/Application Support'}
+    path = Path.home() / settings.get(platform.system(), '') / dir
+    if not path.is_dir():
+        path.mkdir()  # make dir if required
+    return path
+
+
 def is_docker():
     # Is environment a Docker container?
     return Path('/workspace').exists()  # or Path('/.dockerenv').exists()

utils/plots.py

@@ -16,16 +16,14 @@ import seaborn as sn
 import torch
 from PIL import Image, ImageDraw, ImageFont
 
-from utils.general import is_ascii, xyxy2xywh, xywh2xyxy
+from utils.general import user_config_dir, is_ascii, xywh2xyxy, xyxy2xywh
 from utils.metrics import fitness
 
 # Settings
+CONFIG_DIR = user_config_dir()  # Ultralytics settings dir
 matplotlib.rc('font', **{'size': 11})
 matplotlib.use('Agg')  # for writing to files only
 
-FILE = Path(__file__).absolute()
-ROOT = FILE.parents[1]  # yolov5/ dir
-
 
 class Colors:
     # Ultralytics color palette https://ultralytics.com/
@@ -49,9 +47,9 @@ colors = Colors()  # create instance for 'from utils.plots import colors'
 
 
 def check_font(font='Arial.ttf', size=10):
-    # Return a PIL TrueType Font, downloading to ROOT dir if necessary
+    # Return a PIL TrueType Font, downloading to CONFIG_DIR if necessary
     font = Path(font)
-    font = font if font.exists() else (ROOT / font.name)
+    font = font if font.exists() else (CONFIG_DIR / font.name)
     try:
         return ImageFont.truetype(str(font) if font.exists() else font.name, size)
     except Exception as e:  # download if missing