Change install everything to use pip

.. instead of editing PYTHONPATH.

The latter is not persistent

Author: qihqi

README.md

@@ -14,12 +14,9 @@ git clone https://github.com/pytorch-tpu/jetstream-pytorch.git
 ### 2. Run installation script:
 
 ```bash
-source install_everything.sh
+sh install_everything.sh
 ```
 
-NOTE: the above script will export `PYTHONPATH`, so sourcing will make it 
-to take effect in the current shell
-
 
 # Get weights
 

install_everything.sh

@@ -9,10 +9,10 @@ mkdir -p deps
 pushd deps
 git clone https://github.com/google/JetStream.git
 git clone https://github.com/pytorch/xla.git
-pushd xla
+pushd xla/experimental/torch_xla2
 git checkout $TORCHXLA_TAG
-popd
+pip install .
 popd  # now at the folder of jetstream-pytorch
-
-export PYTHONPATH=$PYTHONPATH:$(pwd)/deps/xla/experimental/torch_xla2:$(pwd)/deps/JetStream:$(pwd)
-
+pushd JetStream
+pip install .
+popd