Predictor support (#65)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Laughing-q <1185102784@qq.com>
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

ultralytics/yolo/utils/__init__.py

@@ -6,6 +6,8 @@ import sys
 import threading
 from pathlib import Path
 
+import IPython
+
 # Constants
 FILE = Path(__file__).resolve()
 ROOT = FILE.parents[2]  # YOLO
@@ -29,6 +31,23 @@ def is_kaggle():
     return os.environ.get('PWD') == '/kaggle/working' and os.environ.get('KAGGLE_URL_BASE') == 'https://www.kaggle.com'
 
 
+def is_notebook():
+    # Is environment a Jupyter notebook? Verified on Colab, Jupyterlab, Kaggle, Paperspace
+    ipython_type = str(type(IPython.get_ipython()))
+    return 'colab' in ipython_type or 'zmqshell' in ipython_type
+
+
+def is_docker() -> bool:
+    """Check if the process runs inside a docker container."""
+    if Path("/.dockerenv").exists():
+        return True
+    try:  # check if docker is in control groups
+        with open("/proc/self/cgroup") as file:
+            return any("docker" in line for line in file)
+    except OSError:
+        return False
+
+
 def is_writeable(dir, test=False):
     # Return True if directory has write permissions, test opening a file with write permissions if test=True
     if not test: