Complete output from command python setup.py egg_info:
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "C:\Users\sjiao\AppData\Local\Temp\pip-install-yryv4tgs\Shapely\setup.py", line 80, in <module>
from shapely._buildcfg import geos_version_string, geos_version, \
File "C:\Users\sjiao\AppData\Local\Temp\pip-install-yryv4tgs\Shapely\shapely\_buildcfg.py", line 200, in <module>
lgeos = CDLL("geos_c.dll")
File "d:\code\anaconda\lib\ctypes\__init__.py", line 348, in __init__
self._handle = _dlopen(self._name, mode)
OSError: [WinError 126] 找不到指定的模块。
Command "python setup.py egg_info" failed with error code 1 in C:\Users\sjiao\AppData\Local\Temp\pip-install-yryv4tgs\Shapely\ #### 错误原因
imgaug 依赖的 shapely 安装失败或不正确
下载对应Python版本的 Shapely，可以在https://www.lfd.uci.edu/~gohlke/pythonlibs/#shapely查询、下载
Shapely, a package for creation, manipulation, and analysis of planar geometry objects based on GEOS.
Shapely‑1.6.4.post1‑cp27‑cp27m‑win32.whl
Shapely‑1.6.4.post1‑cp27‑cp27m‑win_amd64.whl
Shapely‑1.6.4.post1‑cp35‑cp35m‑win32.whl
Shapely‑1.6.4.post1‑cp35‑cp35m‑win_amd64.whl
Shapely‑1.6.4.post1‑cp36‑cp36m‑win32.whl
Shapely‑1.6.4.post1‑cp36‑cp36m‑win_amd64.whl
Shapely‑1.6.4.post1‑cp37‑cp37m‑win32.whl
Shapely‑1.6.4.post1‑cp37‑cp37m‑win_amd64.whl
将whl文件下载下来，手动安装：
PS D:\> python -m pip install .\Shapely-1.6.4.post1-cp36-cp36m-win_amd64.whl
Processing d:\shapely-1.6.4.post1-cp36-cp36m-win_amd64.whl
Installing collected packages: Shapely
Successfully installed Shapely-1.6.4.post1
安装成功，再次尝试安装 imgaug 即可
PS D:\> pip install imgaug
Collecting imgaug
Using cached
……
Installing collected packages: imgaug
Successfully installed imgaug-0.2.9