diff --git a/azure-pipelines.yml b/azure-pipelines.yml
new file mode 100644
index 0000000..70cb6f3
--- /dev/null
+++ b/azure-pipelines.yml
@@ -0,0 +1,89 @@
+#
+trigger:
+  paths:
+    exclude:
+      - docs      
+jobs:
+  - job: Fairseq_unittests
+    timeoutInMinutes: 360
+    #pool:
+    #  vmImage: 'ubuntu-18.04'
+    pool: 
+      name: default
+      demands:
+        - agent.name -equals gpu4 
+    steps:
+    - script: |
+        #set up docker
+        sudo docker run --gpus all --privileged   -v '/datadrive/:/datadrive'  -it adsbrainwestus2.azurecr.io/fastseq:dev-py3 /bin/bash
+        #install fastseq
+        pip install --editable .
+      
+        #show environment
+        which python
+        python --version
+        which nvcc
+        nvcc --version
+        which fastseq
+        python -c "import torch; print('torch:', torch.__version__, torch)"
+        python -c "import torch; print('CUDA available:', torch.cuda.is_available())"
+        python -c "import fastseq; print('fastseq:', fastseq.__version__)"
+        
+        #run unit tests
+        #files chnaged in current PR
+        files_changed=$(git --no-pager diff --name-only HEAD $(git merge-base HEAD main))
+        
+        export CUDA_VISIBLE_DEVICES=2,3
+        #check whether this PR is specific to fairseq/transformers/both.
+        #run PR specific unittests.
+        is_fairseq= $(echo $files_changed|grep fairseq)
+        is_transformers=$(echo $files_changed|grep transformers)
+        is_functional=$(echo $files_changed|grep -e .py -e .cu -e .cpp)
+        
+        #purely fairseq change
+        if [ -n "$is_fairseq" -a -z "$is_transformers" ]
+        then
+          bash tests/run_fairseq_tests.sh
+        #purely transformers change
+        else if [ -z "$is_fairseq" -a -n "$is_transformers" ]
+        then
+          bash tests/run_transformers_tests.sh
+        else if [ -n "$is_functional" ]
+        then
+          bash tests/run_fairseq_tests.sh
+          bash tests/run_transformers_tests.sh
+        else
+          #bash tests/run_fairseq_tests.sh
+          #bash tests/run_transformers_tests.sh
+          :
+        fi
+        fi
+        fi
+
+        #install pylint, wrapt update is essential.
+        conda update --name --yes base conda
+        conda update --yes wrapt
+        pip install pylint
+        
+        #install pylint
+        pip install cpplint
+        
+        #Linting checks for python files
+        echo $files_changed|grep .py|while read file; do
+          pylint --rcfile=.pylintrc $file
+        done
+
+        #Linting checks for c++ files
+        echo $files_changed| grep .cpp|while read file; do
+          cpplint $file
+        done
+        
+        #Linting checks for cu files
+        echo $files_changed| grep .cu|while read file; do
+          cpplint $file
+        done
+      
+        #run benchmarks 
+        #cd benchmarks/
+        #CUDA_VISIBLE_DEVICES=3 run_all_benchmarks.sh
+      displayName: 'setup environment and run fairseq unit tests'  
diff --git a/fastseq/optimizer/fairseq/beam_search_optimizer_v1.py b/fastseq/optimizer/fairseq/beam_search_optimizer_v1.py
index 83adba4..a73b166 100644
--- a/fastseq/optimizer/fairseq/beam_search_optimizer_v1.py
+++ b/fastseq/optimizer/fairseq/beam_search_optimizer_v1.py
@@ -1,6 +1,6 @@
 # Copyright (c) Microsoft Corporation.
 # Licensed under the MIT License.
-
+#
 """Apply the beam search optimizations to fairseq-v0.9.0"""
 
 import math