update readme and minor changes

README.md

@@ -119,7 +119,7 @@ See the [Docker example folder](https://github.com/NVIDIA/apex/tree/master/examp
 * Python 3.6
 * Pytorch 1.5 or newer, The HIPExtensions require 1.5 or newer.
 * We recommend follow the instructions from [ROCm-Pytorch](https://github.com/ROCmSoftwarePlatform/pytorch) to install pytorch on ROCm.
-* Note: For Pytorch versions less than 1.8 please consider release package [ROCm-Apex v0.3](https://github.com/ROCmSoftwarePlatform/apex/releases/tag/v0.3) . For pytorch versions >= 1.8, use the master branch as this contains latest hipify revamp changes.
+* Note: For pytorch versions < 1.8, building from source is no longer supported, please use the release package [ROCm-Apex v0.3](https://github.com/ROCmSoftwarePlatform/apex/releases/tag/v0.3) . 
 
 # Quick Start
 

setup.py

@@ -6,8 +6,6 @@ import sys
 import warnings
 import os
 
-from torch.utils.hipify import hipify_python
-
 # ninja build does not work unless include_dirs are abs path
 this_dir = os.path.dirname(os.path.abspath(__file__))