[Executorch][CI] Fix qnn runner ci job scripts

Pull Request resolved: pytorch/executorch#7049

QNN backend's AOT artifacts were being copied in the source directory instead of
them being installed, as build artifacts, in appropriate package directory.

As a result we had to use PYTHON_PATH=".." in test_llama.sh CI script when
running CI for qnn. This results in executorch having two locations as where
the package is installed. This PR fixes that.
ghstack-source-id: 255154890
@exported-using-ghexport

Differential Revision: [D66406274](https://our.internmc.facebook.com/intern/diff/D66406274/)

Author: kimishpatel

.ci/scripts/build-qnn-sdk.sh

@@ -12,13 +12,19 @@ build_qnn_backend() {
   echo "Start building qnn backend."
   export ANDROID_NDK_ROOT=/opt/ndk
   export QNN_SDK_ROOT=/tmp/qnn/2.25.0.240728
-  export EXECUTORCH_ROOT="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/../.." && pwd)"
+  export EXECUTORCH_SRC_ROOT="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/../.." && pwd)"
+  export EXECUTORCH_INSTALL_ROOT="$(python -c 'import executorch; print(executorch.__path__[0])')"
+  if [ "$EXECUTORCH_INSTALL_ROOT" == "" ]; then
+    echo "Failed to find where executorch package is installed."
+    echo "import executorch failed"
+    exit -1
+  fi
 
   bash backends/qualcomm/scripts/build.sh --skip_aarch64 --job_number 2 --release
 }
 
 set_up_aot() {
-  cd $EXECUTORCH_ROOT
+  cd $EXECUTORCH_SRC_ROOT
   if [ ! -d "cmake-out" ]; then
       mkdir cmake-out
   fi
@@ -36,8 +42,8 @@ set_up_aot() {
   cmake --build $PWD --target "PyQnnManagerAdaptor" "PyQnnWrapperAdaptor" -j$(nproc)
   # install Python APIs to correct import path
   # The filename might vary depending on your Python and host version.
-  cp -f backends/qualcomm/PyQnnManagerAdaptor.cpython-310-x86_64-linux-gnu.so $EXECUTORCH_ROOT/backends/qualcomm/python
-  cp -f backends/qualcomm/PyQnnWrapperAdaptor.cpython-310-x86_64-linux-gnu.so $EXECUTORCH_ROOT/backends/qualcomm/python
+  cp -f backends/qualcomm/PyQnnManagerAdaptor.cpython-310-x86_64-linux-gnu.so $EXECUTORCH_INSTALL_ROOT/backends/qualcomm/python
+  cp -f backends/qualcomm/PyQnnWrapperAdaptor.cpython-310-x86_64-linux-gnu.so $EXECUTORCH_INSTALL_ROOT/backends/qualcomm/python
   popd
 
   # Workaround for fbs files in exir/_serialize

.ci/scripts/test_llama.sh

@@ -107,7 +107,6 @@ if [[ "${MODE}" =~ .*qnn.* ]]; then
   export EXECUTORCH_ROOT="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)"
   export QNN_SDK_ROOT=/tmp/qnn/2.25.0.240728
   export LD_LIBRARY_PATH="${QNN_SDK_ROOT}/lib/x86_64-linux-clang"
-  export PYTHONPATH=".."
   cp schema/program.fbs exir/_serialize/program.fbs
   cp schema/scalar_type.fbs exir/_serialize/scalar_type.fbs
   cp -f build-x86/backends/qualcomm/PyQnnManagerAdaptor.cpython-310-x86_64-linux-gnu.so backends/qualcomm/python

.ci/scripts/test_model.sh

@@ -152,10 +152,8 @@ test_model_with_qnn() {
   source "$(dirname "${BASH_SOURCE[0]}")/build-qnn-sdk.sh"
   echo "ANDROID_NDK_ROOT: $ANDROID_NDK_ROOT"
   echo "QNN_SDK_ROOT: $QNN_SDK_ROOT"
-  echo "EXECUTORCH_ROOT: $EXECUTORCH_ROOT"
 
   export LD_LIBRARY_PATH=$QNN_SDK_ROOT/lib/x86_64-linux-clang/
-  export PYTHONPATH=$EXECUTORCH_ROOT/..
 
   if [[ "${MODEL_NAME}" == "dl3" ]]; then
     EXPORT_SCRIPT=deeplab_v3