python 安装指定版本的包/库

pip install -r requirement.txt
// requirement.txt

opencv_python==4.0.0.21
matplotlib==3.0.3
scipy==1.2.1
tensorflow_gpu==1.15.4
torchvision==0.2.2
torch==1.0.1
imgaug==0.2.8
numpy==1.16.2
Pillow==6.2.0
nonechucks==0.3.1
scikit_learn==0.21.2