fix INSTALL.md (#510)

* fix INSTALL.md

* fix PR

* Update INSTALL.md

INSTALL.md

@@ -23,19 +23,8 @@ conda activate maskrcnn_benchmark
 # this installs the right pip and dependencies for the fresh python
 conda install ipython
 
-# maskrcnn_benchmark and coco api dependencies
-pip install -r requirements.txt
-
-# follow PyTorch installation in https://pytorch.org/get-started/locally/
-# we give the instructions for CUDA 9.0
-conda install pytorch-nightly cudatoolkit=9.0 -c pytorch
-
 export INSTALL_DIR=$PWD
-# install torchvision
-cd $INSTALL_DIR
-git clone https://github.com/pytorch/vision.git
-cd vision
-python setup.py install
+
 
 # install pycocotools
 cd $INSTALL_DIR
@@ -47,12 +36,21 @@ python setup.py build_ext install
 cd $INSTALL_DIR
 git clone https://github.com/facebookresearch/maskrcnn-benchmark.git
 cd maskrcnn-benchmark
+
+# maskrcnn_benchmark and coco api dependencies
+pip install -r requirements.txt
+
+# follow PyTorch installation in https://pytorch.org/get-started/locally/
+# we give the instructions for CUDA 9.0
+conda install -c pytorch pytorch torchvision cudatoolkit=9.0
+
 # the following will install the lib with
 # symbolic links, so that you can modify
 # the files if you want and won't need to
 # re-build it
 python setup.py build develop
 
+
 unset INSTALL_DIR
 
 # or if you are on macOS