Use production pytorch now

README.rst

@@ -86,11 +86,9 @@ Here are the dependency installation commands for Ubuntu 18.04 and conda::
     # From the project root
     git submodule sync && git submodule update --init --recursive
 
-You also need to install PyTorch from source (see instructions `here`__). As an alternative, you can install the nightly build (the necessary changes will soon make their way into stable)::
+You also need to install PyTorch 0.4.1 or later::
 
-    conda install -c pytorch pytorch-nightly cuda90
-
-__ https://github.com/pytorch/pytorch#from-source
+    conda install -c pytorch pytorch cuda90
 
 A Dockerfile has been provided if you wish to build ELF using Docker.